CN106568378A - Attach-type radius of curvature measuring method - Google Patents
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Abstract
本发明公开了一种贴附式曲率半径测量方法，能够在不受外界震动影响、不损伤被测表面条件下，通过将柔性导电复合薄膜贴附于待测曲面，实现对待测曲面曲率半径的简单、快速测量，此外，通过本发明方法可实时监测物体曲率的动态变化过程。本发明所用柔性导电复合薄膜重复性能优异，多次弯曲测试后性能稳定，不影响曲率半径测量结果的准确性，经试验验证，该柔性导电复合薄膜经过500次重复弯曲后电阻‑曲率半径关系曲线基本保持不变，同时重复使用半年后经过测试，该柔性导电复合薄膜的性能稳定，其电阻变化率‑曲率关系曲线基本保持不变。本发明测量方法简单便捷，其所用柔性导电复合薄膜的制备工艺简单、成本低廉，具有良好的实用价值和应用前景。
The invention discloses an attached type curvature radius measurement method, which can realize the measurement of the curvature radius of the curved surface to be measured by attaching a flexible conductive composite film to the curved surface to be measured without being affected by external vibrations and without damaging the surface to be measured. Simple and fast measurement, in addition, the dynamic change process of the curvature of the object can be monitored in real time through the method of the invention. The flexible conductive composite film used in the present invention has excellent repeatability, stable performance after multiple bending tests, and does not affect the accuracy of the measurement results of the radius of curvature. It has been verified by experiments that the flexible conductive composite film has a resistance-radius of curvature relationship curve after 500 repeated bendings It remains basically unchanged, and after repeated use for half a year, it is tested that the performance of the flexible conductive composite film is stable, and its resistance change rate-curvature relationship curve remains basically unchanged. The measurement method of the invention is simple and convenient, the preparation process of the flexible conductive composite film used in the invention is simple, the cost is low, and the invention has good practical value and application prospect.
Description
技术领域technical field
本发明涉及曲率半径测量方法，具体涉及一种贴附式曲率半径测量方法。The invention relates to a method for measuring the radius of curvature, in particular to an attached method for measuring the radius of curvature.
背景技术Background technique
无论是在工业生产还是日常生活中，曲率半径的测量是较为普遍且重要的工作。比如在微细加工技术中，会涉及到各种弯曲工件微小曲率半径的测量。在光学加工领域，比如微型透镜，曲率半径是衡量光学零件的主要技术指标。在工业生产中，工件曲率半径的测量方法主要分为两类：接触法和非接触法。其中接触法需要探头在待测表面滑动，容易引起被测面损伤，并且测量需要较长的时间，不适合快速、大批量的现场检测，也不适合快速的批量检测。非接触测量法主要有自准直显微镜测量法和干涉仪测量法两种方法，要求待测面预先经过抛光，且测试受震动的影响明显，不适合现场的工作环境，设备昂贵，同样不适合快速的批量检测。Whether in industrial production or daily life, the measurement of the radius of curvature is a common and important task. For example, in microfabrication technology, it will involve the measurement of the small curvature radius of various curved workpieces. In the field of optical processing, such as microlenses, the radius of curvature is the main technical index to measure optical parts. In industrial production, the measurement methods of workpiece curvature radius are mainly divided into two categories: contact method and non-contact method. Among them, the contact method requires the probe to slide on the surface to be tested, which is easy to cause damage to the surface to be tested, and the measurement takes a long time, so it is not suitable for fast and large-scale on-site testing, nor is it suitable for fast batch testing. Non-contact measurement methods mainly include self-collimating microscope measurement method and interferometer measurement method, which require the surface to be measured to be polished in advance, and the test is significantly affected by vibration, which is not suitable for the on-site working environment, and the equipment is expensive. Fast batch testing.
另外，近些年来，柔性电子器件、智能可穿戴设备开始兴起，柔性器件弯曲状态的监测将成为区别于传统电子器件的重要参数之一。同时人体肢体弯曲状态的实时监测需求对可穿戴的智能产品功能也提出了新的挑战。因此，探索新的实时曲率半径测量方法具有很大的科学价值和实用价值。In addition, in recent years, flexible electronic devices and smart wearable devices have begun to rise, and the monitoring of the bending state of flexible devices will become one of the important parameters different from traditional electronic devices. At the same time, the demand for real-time monitoring of the bending state of human limbs also poses new challenges to the functions of wearable smart products. Therefore, exploring new real-time curvature radius measurement methods has great scientific and practical value.
因此，本发明提出了一种贴附式曲率半径测量方法。Therefore, the present invention proposes an attached method for measuring the radius of curvature.
发明内容Contents of the invention
本发明所要解决的技术问题是，针对现有技术的不足，提供一种贴附式曲率半径测量方法，能够在不受外界震动影响、不损伤被测表面条件下，通过将柔性导电复合薄膜贴附于待测曲面，实现对待测曲面曲率半径的简单、快速测量，此外，通过本发明方法可实时监测物体曲率的动态变化过程。The technical problem to be solved by the present invention is to provide a sticking method for measuring the radius of curvature in view of the deficiencies of the prior art, which can be achieved by pasting a flexible conductive composite film without being affected by external vibrations or damaging the surface to be measured Attached to the curved surface to be measured, the simple and rapid measurement of the curvature radius of the curved surface to be measured is realized. In addition, the dynamic change process of the curvature of the object can be monitored in real time through the method of the invention.
本发明解决上述技术问题所采用的技术方案为：一种贴附式曲率半径测量方法，包括以下步骤：The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an attached type curvature radius measurement method, comprising the following steps:
（1）准备一块柔性导电复合薄膜，在该柔性导电复合薄膜的两端分别连接一个电极，并将该两个电极连接在一欧姆表上，测量该柔性导电复合薄膜平放时的初始电阻R0；(1) Prepare a flexible conductive composite film, connect an electrode to both ends of the flexible conductive composite film, and connect the two electrodes to an ohmmeter, and measure the initial resistance R of the flexible conductive composite film when it is laid flat 0 ;
（2）反复弯曲该柔性导电复合薄膜，测量并记录不同程度弯曲时的柔性导电复合薄膜的曲率半径，同时通过欧姆表测量并记录不同曲率半径下的柔性导电复合薄膜的电阻R，建立该柔性导电复合薄膜的电阻-曲率半径关系曲线，再建立该柔性导电复合薄膜的电阻变化率-曲率关系曲线，其中电阻变化率为R/R0；(2) Repeatedly bend the flexible conductive composite film, measure and record the curvature radius of the flexible conductive composite film at different degrees of bending, and at the same time measure and record the resistance R of the flexible conductive composite film under different curvature radii through an ohmmeter, and establish the flexible conductive composite film. The resistance-radius of curvature relationship curve of the conductive composite film, and then establish the resistance change rate-curvature relationship curve of the flexible conductive composite film, wherein the resistance change rate is R/R 0 ;
（3）将该柔性导电复合薄膜贴附于待测曲面，测量此时柔性导电复合薄膜的电阻值，并计算此时柔性导电复合薄膜的电阻变化率，再将计算得到的电阻变化率与步骤（2）建立的电阻变化率-曲率关系曲线进行比对，得到待测曲面的曲率，取曲率的倒数，即为待测曲面的曲率半径。(3) Attach the flexible conductive composite film to the surface to be tested, measure the resistance value of the flexible conductive composite film at this time, and calculate the resistance change rate of the flexible conductive composite film at this time, and then compare the calculated resistance change rate with the step (2) Compare the established resistance change rate-curvature relationship curves to obtain the curvature of the surface to be tested, and take the reciprocal of the curvature as the radius of curvature of the surface to be tested.
作为优选，所述的柔性导电复合薄膜包括高分子薄膜材料基底及复合于该高分子薄膜材料基底单侧表面的银纳米线导电网络，所述的高分子薄膜材料基底的厚度为0.1~2mm，所述的银纳米线导电网络的面密度为10~300 mg/m2。Preferably, the flexible conductive composite film includes a polymer film material base and a silver nanowire conductive network compounded on one side surface of the polymer film material base, and the thickness of the polymer film material base is 0.1-2mm. The surface density of the silver nanowire conductive network is 10-300 mg/m 2 .
作为优选，所述的银纳米线导电网络由直径40~150 nm、长度20~150 μm的银纳米线构成。Preferably, the silver nanowire conductive network is composed of silver nanowires with a diameter of 40-150 nm and a length of 20-150 μm.
作为优选，所述的柔性导电复合薄膜的制备过程为：在平整玻璃基底的单侧表面多次旋涂含有分散均匀的银纳米线的银纳米线乙醇溶液，每次旋涂后将玻璃基底在60~90℃下烘干，旋涂全部结束后，将玻璃基底在150~250 ℃下热处理15~40 min，即在玻璃基底的表面制备得到所述的银纳米线导电网络；然后通过流延法将胶状的高分子薄膜材料涂覆在所述的玻璃基底的设置有银纳米线导电网络的表面，此后在40~120 ℃下热处理30~240min固化成膜，揭膜后即得到所述的柔性导电复合薄膜。As a preference, the preparation process of the flexible conductive composite film is as follows: repeatedly spin-coat the silver nanowire ethanol solution containing uniformly dispersed silver nanowires on the surface of one side of the flat glass substrate, and place the glass substrate on the glass substrate after each spin coating Drying at 60-90°C, after the spin coating is complete, heat-treat the glass substrate at 150-250°C for 15-40 minutes, that is, prepare the silver nanowire conductive network on the surface of the glass substrate; Colloidal polymer film material is coated on the surface of the glass substrate provided with the silver nanowire conductive network, and then heat-treated at 40-120°C for 30-240min to form a film, and the film is obtained after peeling off the film. flexible conductive composite film.
作为优选，所述的高分子薄膜材料为环氧树脂、聚甲基丙烯酸甲酯、聚苯胺和聚对苯二甲酸乙二醇酯中的任一种。Preferably, the polymer film material is any one of epoxy resin, polymethyl methacrylate, polyaniline and polyethylene terephthalate.
与现有技术相比，本发明的优点在于：本发明公开的贴附式曲率半径测量方法，能够在不受外界震动影响、不损伤被测表面条件下，通过将柔性导电复合薄膜贴附于待测曲面，实现对待测曲面曲率半径的简单、快速测量，此外，通过本发明方法可实时监测物体曲率的动态变化过程。本发明方法所用柔性导电复合薄膜重复性能优异，多次弯曲测试后性能稳定，不影响曲率半径测量结果的准确性，经试验验证，该柔性导电复合薄膜经过500次重复弯曲后电阻-曲率半径关系曲线基本保持不变，同时重复使用半年后经过测试，该柔性导电复合薄膜的性能稳定，其电阻变化率-曲率关系曲线基本保持不变。本发明测量方法简单便捷，其所用柔性导电复合薄膜的制备工艺简单、成本低廉，具有良好的实用价值和应用前景。Compared with the prior art, the present invention has the advantage that: the attached method for measuring the radius of curvature disclosed in the present invention can be attached to The curved surface to be measured realizes simple and rapid measurement of the curvature radius of the curved surface to be measured, and in addition, the dynamic change process of the curvature of the object can be monitored in real time through the method of the invention. The flexible conductive composite film used in the method of the present invention has excellent repeatability, stable performance after multiple bending tests, and does not affect the accuracy of the measurement result of the radius of curvature. It has been verified by experiments that the flexible conductive composite film has a resistance-radius of curvature relationship after 500 repeated bendings The curve basically remains unchanged, and after repeated use for half a year, the performance of the flexible conductive composite film is stable, and its resistance change rate-curvature relationship curve remains basically unchanged. The measurement method of the invention is simple and convenient, the preparation process of the flexible conductive composite film used in the invention is simple, the cost is low, and the invention has good practical value and application prospect.
附图说明Description of drawings
图1为建立的实施例1-4中柔性导电复合薄膜的电阻-曲率半径关系曲线；Fig. 1 is the resistance-radius of curvature relationship curve of the flexible conductive composite film in the embodiment 1-4 of establishment;
图2为实施例2中柔性导电复合薄膜的电阻变化率-曲率关系曲线，其中实线为建立的实施例2中柔性导电复合薄膜的电阻变化率-曲率关系曲线，虚线为实施例2中柔性导电复合薄膜弯曲多次且重复使用半年后薄膜的电阻变化率-曲率关系曲线；Fig. 2 is the resistance change rate-curvature relation curve of the flexible conductive composite film in embodiment 2, wherein the solid line is the resistance change rate-curvature relation curve of the flexible conductive composite film in the embodiment 2 established, and the dotted line is the flexible conduction composite film in embodiment 2. The resistance change rate-curvature relationship curve of the conductive composite film after being bent many times and reused for half a year;
图3为实施例2中柔性导电复合薄膜弯曲300次、500次后薄膜电阻率变化情况，以银纳米线/PET电阻率变化作为参考。Fig. 3 shows the change of resistivity of the flexible conductive composite film in Example 2 after being bent 300 times and 500 times, taking the change of resistivity of silver nanowire/PET as a reference.
具体实施方式detailed description
以下结合附图实施例对本发明作进一步详细描述。The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
实施例1的贴附式曲率半径测量方法，包括以下步骤：The attached type curvature radius measurement method of embodiment 1, comprises the following steps:
（1）准备一块柔性导电复合薄膜，该柔性导电复合薄膜的制备过程为：取4 cm×4 cm的平整玻璃基底，放入超声清洗机超声10 min后干燥，然后用移液枪取适量含有分散均匀的银纳米线的银纳米线乙醇溶液，在玻璃基底上逐滴添加该银纳米线乙醇溶液，重复旋涂8次，旋涂的转速为1500 rpm，每次旋涂后将玻璃基底在80 ℃下加热30 s烘干，旋涂全部结束后，将玻璃基底在200 ℃下热处理20 min，即在玻璃基底的表面制备得到银纳米线导电网络，测得其面密度为69 mg/m2，方块电阻为31 Ω/□；然后通过流延法将800 mg胶状的环氧树脂涂覆在玻璃基底的设置有银纳米线导电网络的表面，此后在80 ℃的烘箱里热处理120 min固化成膜，揭膜后即得到柔性导电复合薄膜；在该柔性导电复合薄膜的两端分别连接一个电极，并将该两个电极连接在一欧姆表上，测量该柔性导电复合薄膜平放时的初始电阻R0，测得R0=31 Ω；(1) Prepare a flexible conductive composite film. The preparation process of the flexible conductive composite film is as follows: take a flat glass substrate of 4 cm × 4 cm, put it into an ultrasonic cleaner for 10 minutes and dry it, and then use a pipette gun to take an appropriate amount of The silver nanowire ethanol solution of uniformly dispersed silver nanowires is added dropwise to the silver nanowire ethanol solution on the glass substrate, and the spin coating is repeated 8 times, and the spin coating speed is 1500 rpm. After each spin coating, the glass substrate is placed on the Heating at 80 ℃ for 30 s and drying. After the spin coating was completed, the glass substrate was heat-treated at 200 ℃ for 20 min, and a conductive network of silver nanowires was prepared on the surface of the glass substrate, and its surface density was measured to be 69 mg/m 2 , the sheet resistance is 31 Ω/□; then, 800 mg of colloidal epoxy resin is coated on the surface of the glass substrate with the conductive network of silver nanowires by casting method, and then heat-treated in an oven at 80 °C for 120 min Curing to form a film, after peeling off the film, a flexible conductive composite film is obtained; an electrode is connected to both ends of the flexible conductive composite film, and the two electrodes are connected to an ohmmeter to measure the time when the flexible conductive composite film is laid flat. The initial resistance R 0 , measured R 0 =31 Ω;
（2）反复弯曲该柔性导电复合薄膜，测量并记录不同程度弯曲时的柔性导电复合薄膜的曲率半径，同时通过欧姆表测量并记录不同曲率半径下的柔性导电复合薄膜的电阻R，建立该柔性导电复合薄膜的电阻-曲率半径关系曲线，再建立该柔性导电复合薄膜的电阻变化率-曲率关系曲线，其中电阻变化率为R/R0；(2) Repeatedly bend the flexible conductive composite film, measure and record the curvature radius of the flexible conductive composite film at different degrees of bending, and at the same time measure and record the resistance R of the flexible conductive composite film under different curvature radii through an ohmmeter, and establish the flexible conductive composite film. The resistance-radius of curvature relationship curve of the conductive composite film, and then establish the resistance change rate-curvature relationship curve of the flexible conductive composite film, wherein the resistance change rate is R/R 0 ;
（3）将该柔性导电复合薄膜贴附于待测曲面，测量此时柔性导电复合薄膜的电阻值，并计算此时柔性导电复合薄膜的电阻变化率，再将计算得到的电阻变化率与步骤（2）建立的电阻变化率-曲率关系曲线进行比对，得到待测曲面的曲率，取曲率的倒数，即为待测曲面的曲率半径。(3) Attach the flexible conductive composite film to the surface to be tested, measure the resistance value of the flexible conductive composite film at this time, and calculate the resistance change rate of the flexible conductive composite film at this time, and then compare the calculated resistance change rate with the step (2) Compare the established resistance change rate-curvature relationship curves to obtain the curvature of the surface to be tested, and take the reciprocal of the curvature as the radius of curvature of the surface to be tested.
实施例2的贴附式曲率半径测量方法，包括以下步骤：The attached type curvature radius measurement method of embodiment 2, comprises the following steps:
（1）准备一块柔性导电复合薄膜，该柔性导电复合薄膜的制备过程为：取4 cm×4 cm的平整玻璃基底，放入超声清洗机超声10 min后干燥，然后用移液枪取适量含有分散均匀的银纳米线的银纳米线乙醇溶液，在玻璃基底上逐滴添加该银纳米线乙醇溶液，重复旋涂10次，旋涂的转速为1500 rpm，每次旋涂后将玻璃基底在80 ℃下加热30 s烘干，旋涂全部结束后，将玻璃基底在200 ℃下热处理20 min，即在玻璃基底的表面制备得到银纳米线导电网络，测得其面密度为88 mg/m2，方块电阻为25 Ω/□；然后通过流延法将800 mg胶状的聚苯胺涂覆在玻璃基底的设置有银纳米线导电网络的表面，此后在80 ℃的烘箱里热处理120min固化成膜，揭膜后即得到柔性导电复合薄膜；在该柔性导电复合薄膜的两端分别连接一个电极，并将该两个电极连接在一欧姆表上，测量该柔性导电复合薄膜平放时的初始电阻R0，测得R0=25 Ω；(1) Prepare a flexible conductive composite film. The preparation process of the flexible conductive composite film is as follows: take a flat glass substrate of 4 cm × 4 cm, put it into an ultrasonic cleaner for 10 minutes and dry it, and then use a pipette gun to take an appropriate amount of The silver nanowire ethanol solution of uniformly dispersed silver nanowires is added dropwise to the silver nanowire ethanol solution on the glass substrate, and the spin coating is repeated 10 times, and the spin coating speed is 1500 rpm. After each spin coating, the glass substrate is placed on the Heating at 80 ℃ for 30 s and drying. After the spin coating was completed, the glass substrate was heat-treated at 200 ℃ for 20 min, and the silver nanowire conductive network was prepared on the surface of the glass substrate, and its surface density was measured to be 88 mg/m 2 , the sheet resistance is 25 Ω/□; then, 800 mg of colloidal polyaniline is coated on the surface of the glass substrate with the conductive network of silver nanowires by casting method, and then heat-treated in an oven at 80 ℃ for 120 minutes to solidify into After the film is peeled off, a flexible conductive composite film is obtained; an electrode is connected to both ends of the flexible conductive composite film, and the two electrodes are connected to an ohmmeter to measure the initial resistance of the flexible conductive composite film when it is laid flat. Resistance R 0 , measured R 0 =25 Ω;
（2）反复弯曲该柔性导电复合薄膜，测量并记录不同程度弯曲时的柔性导电复合薄膜的曲率半径，同时通过欧姆表测量并记录不同曲率半径下的柔性导电复合薄膜的电阻R，建立该柔性导电复合薄膜的电阻-曲率半径关系曲线，再建立该柔性导电复合薄膜的电阻变化率-曲率关系曲线，其中电阻变化率为R/R0；(2) Repeatedly bend the flexible conductive composite film, measure and record the curvature radius of the flexible conductive composite film at different degrees of bending, and at the same time measure and record the resistance R of the flexible conductive composite film under different curvature radii through an ohmmeter, and establish the flexible conductive composite film. The resistance-radius of curvature relationship curve of the conductive composite film, and then establish the resistance change rate-curvature relationship curve of the flexible conductive composite film, wherein the resistance change rate is R/R 0 ;
（3）将该柔性导电复合薄膜贴附于待测曲面，测量此时柔性导电复合薄膜的电阻值，并计算此时柔性导电复合薄膜的电阻变化率，再将计算得到的电阻变化率与步骤（2）建立的电阻变化率-曲率关系曲线进行比对，得到待测曲面的曲率，取曲率的倒数，即为待测曲面的曲率半径。(3) Attach the flexible conductive composite film to the surface to be tested, measure the resistance value of the flexible conductive composite film at this time, and calculate the resistance change rate of the flexible conductive composite film at this time, and then compare the calculated resistance change rate with the step (2) Compare the established resistance change rate-curvature relationship curves to obtain the curvature of the surface to be tested, and take the reciprocal of the curvature as the radius of curvature of the surface to be tested.
实施例3的贴附式曲率半径测量方法，包括以下步骤：The attached type curvature radius measurement method of embodiment 3, comprises the following steps:
（1）准备一块柔性导电复合薄膜，该柔性导电复合薄膜的制备过程为：取4 cm×4 cm的平整玻璃基底，放入超声清洗机超声10 min后干燥，然后用移液枪取适量含有分散均匀的银纳米线的银纳米线乙醇溶液，在玻璃基底上逐滴添加该银纳米线乙醇溶液，重复旋涂12次，旋涂的转速为1500 rpm，每次旋涂后将玻璃基底在80 ℃下加热30 s烘干，旋涂全部结束后，将玻璃基底在200 ℃下热处理20 min，即在玻璃基底的表面制备得到银纳米线导电网络，测得其面密度为109 mg/m2，方块电阻为16 Ω/□；然后通过流延法将800 mg胶状的聚甲基丙烯酸甲酯涂覆在玻璃基底的设置有银纳米线导电网络的表面，此后在80 ℃的烘箱里热处理120 min固化成膜，揭膜后即得到柔性导电复合薄膜；在该柔性导电复合薄膜的两端分别连接一个电极，并将该两个电极连接在一欧姆表上，测量该柔性导电复合薄膜平放时的初始电阻R0，测得R0=16 Ω；(1) Prepare a flexible conductive composite film. The preparation process of the flexible conductive composite film is as follows: take a flat glass substrate of 4 cm × 4 cm, put it into an ultrasonic cleaner for 10 minutes and dry it, and then use a pipette gun to take an appropriate amount of The silver nanowire ethanol solution of uniformly dispersed silver nanowires is added dropwise to the silver nanowire ethanol solution on the glass substrate, and the spin coating is repeated 12 times, and the spin coating speed is 1500 rpm. After each spin coating, the glass substrate is placed on the Heating at 80 ℃ for 30 s and drying. After the spin coating was completed, the glass substrate was heat-treated at 200 ℃ for 20 min, and the conductive network of silver nanowires was prepared on the surface of the glass substrate, and its surface density was measured to be 109 mg/m 2 , the sheet resistance is 16 Ω/□; then, 800 mg colloidal polymethyl methacrylate is coated on the surface of the glass substrate provided with the conductive network of silver nanowires by casting method, and thereafter in an oven at 80 °C Heat treatment for 120 min to solidify into a film, and the flexible conductive composite film is obtained after the film is peeled off; an electrode is respectively connected to both ends of the flexible conductive composite film, and the two electrodes are connected to an ohmmeter, and the flexible conductive composite film is measured. The initial resistance R 0 when placed flat, measured R 0 =16 Ω;
（2）反复弯曲该柔性导电复合薄膜，测量并记录不同程度弯曲时的柔性导电复合薄膜的曲率半径，同时通过欧姆表测量并记录不同曲率半径下的柔性导电复合薄膜的电阻R，建立该柔性导电复合薄膜的电阻-曲率半径关系曲线，再建立该柔性导电复合薄膜的电阻变化率-曲率关系曲线，其中电阻变化率为R/R0；(2) Repeatedly bend the flexible conductive composite film, measure and record the curvature radius of the flexible conductive composite film at different degrees of bending, and at the same time measure and record the resistance R of the flexible conductive composite film under different curvature radii through an ohmmeter, and establish the flexible conductive composite film. The resistance-curvature curve of the conductive composite film, and then establish the resistance change rate-curvature relationship curve of the flexible conductive composite film, wherein the resistance change rate is R/R 0 ;
（3）将该柔性导电复合薄膜贴附于待测曲面，测量此时柔性导电复合薄膜的电阻值，并计算此时柔性导电复合薄膜的电阻变化率，再将计算得到的电阻变化率与步骤（2）建立的电阻变化率-曲率关系曲线进行比对，得到待测曲面的曲率，取曲率的倒数，即为待测曲面的曲率半径。(3) Attach the flexible conductive composite film to the surface to be tested, measure the resistance value of the flexible conductive composite film at this time, and calculate the resistance change rate of the flexible conductive composite film at this time, and then compare the calculated resistance change rate with the step (2) Compare the established resistance change rate-curvature relationship curves to obtain the curvature of the surface to be tested, and take the reciprocal of the curvature as the radius of curvature of the surface to be tested.
实施例4的贴附式曲率半径测量方法，包括以下步骤：The attached type curvature radius measurement method of embodiment 4, comprises the following steps:
（1）准备一块柔性导电复合薄膜，该柔性导电复合薄膜的制备过程为：取4 cm×4 cm的平整玻璃基底，放入超声清洗机超声10 min后干燥，然后用移液枪取适量含有分散均匀的银纳米线的银纳米线乙醇溶液，在玻璃基底上逐滴添加该银纳米线乙醇溶液，重复旋涂12次，旋涂的转速为1500 rpm，每次旋涂后将玻璃基底在80 ℃下加热30 s烘干，旋涂全部结束后，将玻璃基底在200 ℃下热处理20 min，即在玻璃基底的表面制备得到银纳米线导电网络，测得其面密度为159 mg/m2，方块电阻为9 Ω/□；然后通过流延法将800 mg胶状的聚对苯二甲酸乙二醇酯涂覆在玻璃基底的设置有银纳米线导电网络的表面，此后在80 ℃的烘箱里热处理120 min固化成膜，揭膜后即得到柔性导电复合薄膜；在该柔性导电复合薄膜的两端分别连接一个电极，并将该两个电极连接在一欧姆表上，测量该柔性导电复合薄膜平放时的初始电阻R0，测得R0=9 Ω；(1) Prepare a flexible conductive composite film. The preparation process of the flexible conductive composite film is as follows: take a flat glass substrate of 4 cm × 4 cm, put it into an ultrasonic cleaner for 10 minutes and dry it, and then use a pipette gun to take an appropriate amount of The silver nanowire ethanol solution of uniformly dispersed silver nanowires is added dropwise to the silver nanowire ethanol solution on the glass substrate, and the spin coating is repeated 12 times, and the spin coating speed is 1500 rpm. After each spin coating, the glass substrate is placed on the Heating at 80 ℃ for 30 s and drying, after the spin coating was completed, the glass substrate was heat-treated at 200 ℃ for 20 min, and the silver nanowire conductive network was prepared on the surface of the glass substrate, and its surface density was measured to be 159 mg/m 2 , the sheet resistance is 9 Ω/□; then, 800 mg colloidal polyethylene terephthalate is coated on the surface of the glass substrate provided with the conductive network of silver nanowires by casting method, and then heated at 80 ℃ Heat treatment in a special oven for 120 min to solidify into a film, and after peeling off the film, a flexible conductive composite film is obtained; an electrode is connected to both ends of the flexible conductive composite film, and the two electrodes are connected to an ohmmeter to measure the flexibility. The initial resistance R 0 of the conductive composite film when it is placed flat is measured as R 0 =9 Ω;
（2）反复弯曲该柔性导电复合薄膜，测量并记录不同程度弯曲时的柔性导电复合薄膜的曲率半径，同时通过欧姆表测量并记录不同曲率半径下的柔性导电复合薄膜的电阻R，建立该柔性导电复合薄膜的电阻-曲率半径关系曲线，再建立该柔性导电复合薄膜的电阻变化率-曲率关系曲线，其中电阻变化率为R/R0；(2) Repeatedly bend the flexible conductive composite film, measure and record the curvature radius of the flexible conductive composite film at different degrees of bending, and at the same time measure and record the resistance R of the flexible conductive composite film under different curvature radii through an ohmmeter, and establish the flexible conductive composite film. The resistance-radius of curvature relationship curve of the conductive composite film, and then establish the resistance change rate-curvature relationship curve of the flexible conductive composite film, wherein the resistance change rate is R/R 0 ;
（3）将该柔性导电复合薄膜贴附于待测曲面，测量此时柔性导电复合薄膜的电阻值，并计算此时柔性导电复合薄膜的电阻变化率，再将计算得到的电阻变化率与步骤（2）建立的电阻变化率-曲率关系曲线进行比对，得到待测曲面的曲率，取曲率的倒数，即为待测曲面的曲率半径。(3) Attach the flexible conductive composite film to the surface to be tested, measure the resistance value of the flexible conductive composite film at this time, and calculate the resistance change rate of the flexible conductive composite film at this time, and then compare the calculated resistance change rate with the step (2) Compare the established resistance change rate-curvature relationship curves to obtain the curvature of the surface to be tested, and take the reciprocal of the curvature as the radius of curvature of the surface to be tested.
制备柔性导电复合薄膜过程中，增加旋涂次数，可以制备不同银纳米线面密度的导电网络结构，该银纳米线导电网络由直径40~150 nm、长度20~150 μm的银纳米线构成，高分子薄膜材料基底的厚度一般为0.1~2 mm。In the process of preparing flexible conductive composite films, increasing the number of spin coatings can prepare conductive network structures with different surface densities of silver nanowires. The silver nanowire conductive network is composed of silver nanowires with a diameter of 40-150 nm and a length of 20-150 μm. The thickness of the polymer film material substrate is generally 0.1-2 mm.
建立的实施例1-4中柔性导电复合薄膜的电阻-曲率半径关系曲线见图1，建立的实施例2中柔性导电复合薄膜的电阻变化率-曲率关系曲线见图2中实线，实施例2中柔性导电复合薄膜弯曲多次且重复使用半年后薄膜的电阻变化率-曲率关系曲线见图2中虚线。实施例2中柔性导电复合薄膜（即AgNWs/Resin）弯曲300次、500次后薄膜电阻率变化情况见图3，以银纳米线/PET（即AgNWs/PET）电阻率变化作为参考。The resistance-radius of curvature relational curve of the flexible conductive composite film in the embodiment 1-4 of establishment is shown in Fig. 1, and the resistance change rate-curvature relational curve of the flexible conductive composite film in the embodiment 2 of establishment is shown in the solid line in Fig. 2, embodiment The resistance change rate-curvature relationship curve of the flexible conductive composite film in 2 is shown in the dotted line in Fig. 2 after being bent several times and reused for half a year. The resistivity change of the flexible conductive composite film (AgNWs/Resin) in Example 2 after being bent 300 times and 500 times is shown in Figure 3, taking the resistivity change of silver nanowire/PET (AgNWs/PET) as a reference.
从图1-图3可见，本发明方法所用柔性导电复合薄膜重复性能优异，多次弯曲测试后性能稳定，不影响曲率半径测量结果的准确性；该柔性导电复合薄膜经过500次重复弯曲后电阻-曲率半径关系曲线基本保持不变，同时重复使用半年后经过测试，该柔性导电复合薄膜的性能稳定，其电阻变化率-曲率关系曲线基本保持不变。It can be seen from Fig. 1-Fig. 3 that the flexible conductive composite film used in the method of the present invention has excellent repeatability, stable performance after multiple bending tests, and does not affect the accuracy of the measurement results of the radius of curvature; the flexible conductive composite film has an electrical resistance after 500 repeated bendings. - Curvature radius relationship curve remains basically unchanged, and after repeated use for half a year, the performance of the flexible conductive composite film is stable, and its resistance change rate-curvature relationship curve remains basically unchanged.
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