CN103509192B - A kind of isotatic polypropylene-b-polyoxyethylene glycol two block thing and preparation method thereof - Google Patents

Abstract

The invention relates to polypropylene modification and aims to provide an isotactic polypropylene-b-polyethylene glycol diblock and a preparation method thereof. The invention adopts the isocyanate coupling method, first introduces the isocyanate into the end of the methoxy polyethylene glycol, and then couples the isocyanate group-terminated polyethylene glycol with the hydroxyl-terminated isotactic polypropylene to prepare iPP-b-mPEG. Compared with the prior art, the steps of the present invention are simple and easy to realize; the raw materials used are common industrial raw materials, which are cheap and easy to industrialized production; the performance of the block copolymer can be regulated by adjusting the lengths of the two chain segments (The number-average molecular weight of iPP is 1000-15000 g/mol, and the number-average molecular weight of mPEG is 300-5300 g/mol); the iPP segment in the prepared iPP-b-mPEG maintains a high isotacticity.

Description

A kind of isotactic polypropylene-b-polyethylene glycol diblock and its preparation method

technical field

The invention relates to polypropylene modification technology, in particular to an isotactic polypropylene-b-polyethylene glycol diblock and a preparation method thereof.

Background technique

Due to its good mechanical properties, stable thermal and chemical properties, good electrical insulation properties and high cost performance, polypropylene has been widely used in packaging, automobiles, construction and even military fields. In 2010, the world's polypropylene demand reached 53,570kt, and the total production capacity reached 60,980kt/a. In recent years, the global demand and production capacity of PP have maintained a steady growth momentum. However, due to the chemical inertness of polypropylene itself, the non-polar and crystalline characteristics of its molecular chain make it have low surface energy and hydrophobic characteristics. The extremely low surface energy leads to poor interfacial compatibility of polypropylene when it is blended with other organic and inorganic materials to prepare composite materials, and the mechanical properties of composite materials are greatly affected; the hydrophobicity of polypropylene also limits its use in Dyeing, bonding, printing and other applications. Polypropylene is divided into isotactic polypropylene, syndiotactic polypropylene and atactic polypropylene, among which isotactic polypropylene is used in the largest amount, so the functionalization of isotactic polypropylene has always been a hot spot in scientific research.

There are four main methods for the functionalization of polypropylene: 1) Surface treatment: put isotactic polypropylene in an atmosphere of air, ozone, and ammonia, and use high-energy rays, electron beams, or plasma radiation to treat the surface of polypropylene. , to generate polar groups such as hydroxyl and carboxyl on the surface. This method requires expensive equipment, and the modification effect will disappear with the prolongation of use time; 2) Free radical graft modification: mix polypropylene with polar monomers such as maleic anhydride, acrylic acid or acrylamide, and use free The radical initiator initiates graft copolymerization of polar monomers to generate polar side groups or side chains. However, polypropylene is prone to degradation or crosslinking during the reaction process, which greatly destroys the inherent mechanical properties and processing properties of polypropylene; 3) direct copolymerization: the propylene monomer and the monomer with functional groups are combined under the action of a catalyst Direct copolymerization to prepare copolymers containing special functional groups. Although the direct copolymerization method is the fastest way to introduce special functional groups into polypropylene, it cannot obtain functionalized polypropylene with high isotacticity, and because the commonly used Ziegler-Natta catalysts and metallocene catalysts are very easy to combine with polar monomers The N and O atoms on the surface are deactivated by forming a stable complex, which greatly limits its industrial production; 4) physical blending or surface coating: these two methods have the advantages of low production cost, simple operation, flexible and changeable, etc. And widely used in polypropylene modification. However, isotactic polypropylene has high regularity and crystallization ability, which makes it poorly compatible with other polymers, even its homologues (such as syndiotactic polypropylene, atactic polypropylene). Therefore, when modifying isotactic polypropylene by physical blending or surface coating, it is often necessary to use block copolymers containing isotactic polypropylene segments as compatibilizers to significantly improve the polarity of polypropylene. Polymer Compatibility.

At present, the main idea of synthesizing block copolymers containing isotactic polypropylene segments is: first prepare terminal functionalized isotactic polypropylene by coordination polymerization, and then use free radical polymerization, living/controlled polymerization or coupling The method prepares a block copolymer containing isotactic polypropylene. Chung et al. (Macromolecules, 1998, 31 (17): 5943; Macromolecules, 1999, 32 (8): 2525. ) prepared polypropylene-b-(Ma anhydride-alt-styrene) block copolymer. Kashiwa (Journal of Polymer Science Part A: Polymer Chemistry.2009,47(3): 812) directly brominated polypropylene with terminal ethyl groups to form an initiator for controlled free radical polymerization, and then initiated styrene, methyl Polypropylene block copolymers were prepared by polymerizing monomers such as methyl acrylate and n-butyl acrylate. Dong (J. Am. Chem. Soc., 2001.123(21):4871) et al. prepared p-methylstyrene-terminated polypropylene, and then introduced living anionic polymerization at the end of polypropylene to initiate agent to initiate the anionic living polymerization of styrene to prepare a polypropylene/styrene block copolymer. Dong et al. (Macromolecules, 2000,43(20): 8331; Appl Organomet Chem., 2011, 25(8):632)) etc. used rac-Me ₂ Si[2-Me-4-Ph-Ind] ₂ ZrCl ₂ (SiPh)/AlOct ₂ /CPh ₃ B(C ₆ F ₅ ) ₄ /ZnOct ₂ catalytic system prepared iodine-terminated isotactic polypropylene, and then converted it into azido-terminated isotactic polypropylene; the prepared Hydroxyl isotactic polypropylene, under the action of bis-(trichloromethyl)carbonate and NMe ₄ Cl, reacts with propargyl amine to prepare alkynyl-terminated isotactic polypropylene; finally, the functional isotactic polypropylene block copolymer. Although all the above methods can prepare a two-block copolymer of isotactic polypropylene, there are still various problems: 1) Free radical polymerization cannot achieve controllable molecular weight and structure, and it is difficult to control the properties of block polymers ;2) In controlled free radical polymerization, the ATRP method needs to remove the transition metal complex after the reaction, the preparation process of the dithioester in the RAFT method is complicated and difficult to be applied industrially, and the NMRP method has disadvantages such as a small range of applicable monomers; 3 ) The anionic polymerization reaction conditions are harsh, and large-scale industrial production cannot be realized; 4) The preparation process of click chemistry is complicated, and there is also the problem of difficulty in subsequent industrialization. In view of the above problems, the present invention provides a simple isotactic polypropylene-b-polyethylene glycol diblock (iPP-b-mPEG) and a preparation method thereof.

Contents of the invention

The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art and provide a diblock of isotactic polypropylene-b-polyethylene glycol and a preparation method thereof. The invention adopts the isocyanate coupling method, first introduces the isocyanate into the end of the methoxy polyethylene glycol, and then couples the isocyanate group-terminated polyethylene glycol with the hydroxyl-terminated isotactic polypropylene to prepare iPP-b-mPEG.

For solving technical problem, solution of the present invention is:

An isotactic polypropylene-b-polyethylene glycol diblock is provided, the structural formula of which is as shown in any one of the formulas (I) to (IV):

In formulas (I) to (IV), m = any integer between 7 and 120, and n = any integer between 100 and 400.

The present invention further provides a method for preparing the aforementioned isotactic polypropylene-b-polyethylene glycol diblock, comprising the following steps:

(1) Add the reactants methoxypolyethylene glycol, diisocyanate, catalyst dibutyltin dilaurate and solvent chloroform in sequence in a Schlenk bottle equipped with a reflux condenser, strictly dried and pumped with nitrogen three times; Methoxy polyethylene glycol and diisocyanate undergo nucleophilic substitution reaction under the effect of catalyst dibutyltin laurate to obtain terminal isocyanate group polyethylene glycol; the molar ratio of said methoxy polyethylene glycol to diisocyanate The ratio is 1:5 to 1:100, the amount of dibutyltin dilaurate added is 1% of the total mass of reactants, and the concentration of methoxypolyethylene glycol in the reaction system is 0.03 mol/L to 0.1 mol/L; The reaction temperature is 25℃～60℃, and the reaction time is 4～24 hours;

(2) In a Schlenk bottle equipped with a reflux condenser, which was strictly dried and pumped three times with nitrogen, sequentially add hydroxyl-terminated functionalized isotactic polypropylene, prepared isocyanate-terminated polyethylene glycol, organic solvent and The catalyst is dibutyltin dilaurate; the isocyanate-terminated polyethylene glycol and the hydroxyl-terminated functionalized isotactic polypropylene undergo a nucleophilic addition reaction under the action of the catalyst dibutyltin dilaurate to obtain isotactic polypropylene-b-polyethylene Diol diblocks; the molar ratio of terminal hydroxyl groups of hydroxyl-terminated isotactic polypropylene to isocyanate-terminated polyethylene glycol is 1:1 to 1:10, and the amount of dibutyltin dilaurate added is 1/2 of the total mass of reactants 1% to 5%, the concentration of hydroxyl-terminated isotactic polypropylene in the reaction system is 0.03 mol/L to 0.1 mol/L; the reaction temperature is 90°C to 130°C, and the reaction time is 4 to 24 hours.

In the present invention, the organic solvent in the step (2) is toluene, xylene, heptane, octane or any mixture thereof.

In the present invention, the methoxypolyethylene glycol is a linear molecule with a molecular weight of 350-5300 g/mol and a molecular weight distribution of 1.1-1.9.

In the present invention, the number-average molecular weight of the hydroxyl-terminated functionalized isotactic polypropylene is 3000-15000 g/mol, and the molecular weight distribution is 3-10.

In the present invention, the diisocyanate is hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate or diphenylmethane diisocyanate.

Compared with prior art, the beneficial effect of the present invention is:

1) Through the coupling reaction between hydroxyl and diisocyanate, PEG is attached to the end of hydroxyl-terminated iPP to prepare iPP-b-mPEG with regular structure. This method has simple steps and is easy to implement;

2) The raw materials used (such as diisocyanate, methoxypolyethylene glycol, dibutyltin dilaurate, etc.) are common industrial raw materials with low price and easy industrial production;

3) The properties of the block copolymer can be adjusted by adjusting the length of the two chain segments (the number average molecular weight of iPP is 1000~15000 g/mol, and the number average molecular weight of mPEG is 300~5300 g/mol);

4) The iPP segment in the prepared iPP-b-mPEG maintains a high isotacticity.

Description of drawings

Figure 1 is a typical ¹ H NMR chart of the iPP-b-mPEG diblock in Example 17 of the present invention.

Detailed ways

The isotactic polypropylene-b-polyethylene glycol diblock of the present invention has a structural formula of any one of the following: isophorone-type isophorone-type isophorone-polyethylene glycol of the formula (I) Diblocks (abbreviated as iPP-IPDI-mPEG in the present invention), or diphenylmethane type polypropylene-b-polyethylene glycol diblocks of formula (II) (iPP-MDI-mPEG in the present invention for short), Or hexamethylene type isotactic polypropylene-b-polyethylene glycol diblock of formula (Ⅲ) (the present invention is referred to as iPP-HDI-mPEG), or toluene type isotactic polypropylene of formula (Ⅳ)- b-polyethylene glycol diblock (abbreviated as iPP-TDI-mPEG in the present invention).

The invention provides the preparation method of this type of isotactic polypropylene-b-polyethylene glycol diblock polymer:

1. Preparation of isocyanate-terminated polyethylene glycol

Methoxy Polyethylene Glycol (Methoxy Polyethylene Glycol, referred to as mPEG) and diisocyanate are catalyzed by dibutyltin dilaurate (abbreviated as DBTDL) for nucleophilic addition reaction to prepare isocyanate-terminated polyethylene glycol (the present invention is referred to as mPEG-t-NCO), the chemical formula of the methoxypolyethylene glycol is:

In this formula, any integer between n=7~120.

Used diisocyanate chemical formula is shown in formula (I') or formula (II') or formula (III') or formula (IV'):

The chemical formula of dibutyltin dilaurate used is:

In a Schlenk bottle equipped with a reflux condenser, which was strictly dried and evacuated three times with nitrogen, methoxypolyethylene glycol, diisocyanate, catalyst dibutyltin dilaurate, and solvents (chloroform, tetrachloroethane, etc.) were successively added. or toluene). The reaction temperature of the reaction is 25°C-60°C, and the reaction time is 4-24 h; the molar ratio of methoxypolyethylene glycol to diisocyanate is 1:5-1:100; the amount of dibutyltin dilaurate added It is 1% of the reactant mass; the concentration of methoxypolyethylene glycol in the reaction system is 0.03 mol/L～0.1 mol/L; the methoxypolyethylene glycol used is linear, and its molecular weight is 350～ 5300 g/mol; the diisocyanate used is one of hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), toluene diisocyanate (TDI) or diphenylmethane diisocyanate (MDI) or Several kinds.

The molecular formula of the intermediate product is formula (V') isophorone-type isocyanate-terminated polyethylene glycol (the present invention is referred to as mPEG-IPDI-NCO) or formula (VI') hexamethylene-type isocyanate-terminated polyethylene glycol ( The present invention is referred to as mPEG-HDI-NCO) or formula (VII') toluene-type isocyanate-terminated polyethylene glycol (the present invention is referred to as mPEG-TDI-NCO) or formula (VIII') diphenylmethane-type isocyanate-terminated polyethylene glycol Diol (abbreviated as mPEG-MDI-NCO in the present invention):

In formula (V') ~ formula (VIII'), n = any integer between 7 and 120.

2. Preparation of isotactic polypropylene-b-polyethylene glycol diblock

In a Schlenk bottle equipped with a reflux condenser, strictly dried and pumped with nitrogen three times, add hydroxyl-terminated polypropylene (hydroxy-terminated polypropylene for short iPP-t-OH) and the terminal prepared in the previous step in sequence. Isocyanate-based polyethylene glycol (abbreviated as mPEG-t-NCO in this invention) and solvent, after stirring evenly, add the catalyst dibutyltin dilaurate (DBTDL for short), the reaction temperature is 90℃～130℃; the reaction time is 4 ~24 h; the molar ratio of isocyanate-terminated polyethylene glycol to hydroxyl-terminated isotactic polypropylene is 1:1-1:1.6, the amount of dibutyltin dilaurate added is 1-5% of the mass of the reactant, and the hydroxyl-terminated The concentration of functionalized isotactic polypropylene in the reaction system is 0.03 mol/L to 0.1 mol/L; the functionalized isotactic polypropylene with terminal hydroxyl groups is linear, with a tacticity of ≥95% and a number average molecular weight of 3000 ~15000 g/mol, the molecular weight distribution is 3~10, and the capping rate of terminal hydroxyl group is ≥70%. Preparation of isotactic polypropylene-b-polyethylene glycol diblock (abbreviated as iPP-b-mPEG in the present invention), the chemical formula of the functionalized isotactic polypropylene with terminal hydroxyl groups is:

m = any integer between 100~400

Example 1

In a strictly dry Schlenk bottle equipped with a reflux condenser and pumped three times with nitrogen, add 3.5 g (0.01 mol) mPEG (M _n = 350), 2.5 g (0.1 mol) MDI, 0.06 g dilaurel Dibutyltin dibutyltin (1wt.%) and 200 mL of chloroform were heated up to 25°C for 8 h, and the product was precipitated in a large amount of ether. After three times of chloroform/ether dissolution/cycle precipitation, vacuum drying at 40°C to constant weight was prepared. The intermediate product mPEG-t-NCO white powder 5.5g was obtained.

Example 2

Other experimental conditions are the same as in Example 1, adding 10 g (0.1 mol) (M _n = 1000), 12.5 g (0.5 mol) MDI, and 0.225 g dibutyltin dilaurate to prepare the intermediate product mPEG-t-NCO white powder 8.3g.

Example 3

Other experimental conditions were the same as in Example 1. 10 g (0.005 mol) mPEG (M _n =2000) and 0.125 g dibutyltin dilaurate were added to prepare 12.1 g white powder of intermediate product mPEG-t-NCO.

Example 4

Other experimental conditions were the same as in Example 1, 5.3g (0.001 mol) mPEG (M _n =5300) and 0.078g dibutyltin dilaurate were added to prepare 5.02g white powder of intermediate product mPEG-t-NCO.

Example 5

Other experimental conditions were the same as in Example 1, the reaction temperature was 40°C, and 5.8 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 6

Other experimental conditions were the same as in Example 1, and the reaction temperature was 60° C., and 5.2 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 7

Other experimental conditions were the same as in Example 1, the solvent chloroform was 333 mL (the concentration of methoxypolyethylene glycol was controlled to 0.03 mol/L), and 5.8 g of white powder of the intermediate product mPEG-t-NCO was prepared.

Example 8

Other experimental conditions were the same as in Example 1, the solvent chloroform was 200 mL (the concentration of methoxypolyethylene glycol was controlled at 0.05 mol/L), and 5.3 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 9

Other experimental conditions were the same as in Example 1, the solvent chloroform was 125 mL (the concentration of methoxypolyethylene glycol was controlled to be 0.08 mol/L), and 5.5 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 10

Other experimental conditions were the same as in Example 1, the solvent chloroform was 100 mL (the concentration of methoxypolyethylene glycol was controlled to 0.1 mol/L), and 5.0 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 11

Other experimental conditions were the same as in Example 1, adding 1.68 g of HDI and 0.052 g of dibutyltin dilaurate to prepare 4.8 g of the intermediate product mPEG-t-NCO white powder.

Example 12

Other experimental conditions were the same as in Example 1, 1.74 g TDI and 0.052 g dibutyltin dilaurate were added to prepare 4.3 g of the intermediate product mPEG-t-NCO white powder.

Example 13

Other experimental conditions were the same as in Example 1, adding 2.2 g of IPDI and 0.057 g of dibutyltin dilaurate to prepare 5.2 g of the intermediate product mPEG-t-NCO white powder.

Example 14

Other experimental conditions were the same as in Example 1, the reaction time was 4 h, and 5.3 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 15

Other experimental conditions were the same as in Example 1, the reaction time was 12 h, and 5.7 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 16

Other experimental conditions were the same as in Example 1, the reaction time was 24 h, and 5.7 g of the intermediate product mPEG-t-NCO white powder was prepared.

Example 17

In a strictly dry Schlenk bottle equipped with a reflux condenser and pumped three times with nitrogen, 2.25 g (1 mmol) mPEG-t-NCO (Mn=2250 g/mol), 4.43 g iPP-t-OH (M _n = 3100, the proportion of terminal hydroxyl groups is ≥ 70%, and the content of hydroxyl groups is controlled to be 1 mmol) and 200 mL of solvent toluene are sequentially added to a Schlenk bottle equipped with a reflux condenser, and 0.0668 g of dibutyltin dilaurate ( 1wt.%), raised the temperature to 100°C for 8 hours, and removed the solvent by rotary evaporation, washed repeatedly with acetone to remove the unreacted mPEG-t-NCO, dried in vacuum at 40°C to constant weight, and prepared the diblock polymer iPP - MDI-mPEG white powder 4.9 g.

Example 18

Other experimental conditions are the same as in Example 17, adding 6.86g iPP-t-OH (M _n = 4800, terminal hydroxyl ratio ≥ 70%, controlling the hydroxyl content to 1 mmol), 0.0911g catalyst dibutyltin dilaurate (1wt.% ), and 5.58 g of white powder of diblock polymer iPP-MDI-mPEG was prepared.

Example 19

Other experimental conditions are the same as in Example 17, adding 0.225g (1 mmol) mPEG-t-NCO, 0.842 g iPP-t-OH (M _n = 5900, the proportion of terminal hydroxyl groups ≥ 70%, and controlling the hydroxyl content to 0.1 mmol), 0.0107g of catalyst dibutyltin dilaurate (1wt.%) was used to prepare 0.98g of white powder of diblock polymer iPP-MDI-mPEG.

Example 20

Other experimental conditions are the same as in Example 19, adding 1.143g iPP-t-OH (M _n = 8000, the proportion of terminal hydroxyl groups ≥ 70%, controlling the hydroxyl content to 0.1 mmol), 0.0136g catalyst dibutyltin dilaurate (1wt.% ), prepared diblock polymer iPP-MDI-mPEG white powder 1.28g

Example 21

Other experimental conditions are the same as in Example 19, adding 2.142g iPP-t-OH (M _n = 15000, the proportion of terminal hydroxyl groups ≥ 70%, and controlling the hydroxyl content to 0.1 mmol), 0.0237g catalyst dibutyltin dilaurate (1wt.% ) to prepare 2.15 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 22

Other experimental conditions were the same as in Example 17, adding 333 mL of solvent toluene (controlling the concentration of hydroxyl-terminated isotactic polypropylene to 0.03 mol/L) to prepare 4.08 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 23

Other experimental conditions were the same as in Example 17, adding 200 mL of solvent toluene (controlling the concentration of hydroxyl-terminated isotactic polypropylene to 0.05 mol/L) to prepare 4.1 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 24

Other experimental conditions were the same as in Example 17, adding 100 mL of solvent toluene (controlling the concentration of hydroxyl-terminated isotactic polypropylene to 0.1 mol/L) to prepare 3.5 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 25

Other experimental conditions were the same as those in Example 17. The solvent n-heptane was added, the reaction temperature was 90° C., and the reaction time was 24 h to prepare 3.1 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 26

Other experimental conditions were the same as those in Example 17. The solvent n-octane was added, the reaction temperature was 110°C, and the reaction time was 6 h to prepare 3.4 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 27

Other experimental conditions were the same as in Example 17, adding the solvent xylene, the reaction temperature was 130° C., and the reaction time was 4 h to prepare 5.2 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 28

Other experimental conditions are the same as in Example 17, adding 2.17g mPEG-HDI-NCO (M _n = 2168, 1 mmol), 0.0465g catalyst dibutyltin dilaurate (1wt.%), and preparing a diblock polymer iPP- HDI-mPEG white powder 3.9 g.

Example 29

Other experimental conditions are the same as in Example 17, adding 2.17g mPEG-TDI-NCO (M _n = 2174, 1 mmol), 0.0465g catalyst dibutyltin dilaurate (1wt.%), and preparing a diblock polymer iPP- TDI-mPEG white powder 3.6g.

Example 30

Other experimental conditions are the same as in Example 17, adding 2.22g mPEG-IPDI-NCO (M _n = 2222, 1 mmol), 0.0470g catalyst dibutyltin dilaurate (1wt.%), and preparing a diblock polymer iPP- IPDI-mPEG white powder 3.9g.

Example 31

Other experimental conditions were the same as in Example 17, and 0.20 g of catalyst dibutyltin dilaurate (3 wt.%) was added to prepare 4.8 g of white powder of diblock polymer iPP-MDI-mPEG.

Example 32

Other experimental conditions were the same as in Example 17, and 0.334 g of catalyst dibutyltin dilaurate (5 wt.%) was added to prepare 4.8 g of white powder of diblock polymer iPP-MDI-mPEG.

Claims (5)

1. an isotatic polypropylene-b-polyoxyethylene glycol two block thing, is characterized in that, its structural formula is as shown in any one in formula I ~ (IV):

In formula I ~ (IV), the arbitrary integer between m=7 ~ 120, the arbitrary integer between n=100 ~ 400.

2. prepare a method for isotatic polypropylene-b-polyoxyethylene glycol two block thing described in claim 1, it is characterized in that, comprise the following steps:

(1) be equipped with reflux condensing tube, dry and in the Schlenk bottle of nitrogen pump drainage 3 times, add reactant methoxy poly (ethylene glycol), vulcabond, catalyst dibutyltin dilaurylate and solvent chloroform successively; There is nucleophilic substitution reaction in methoxy poly (ethylene glycol) and vulcabond, obtain terminal isocyanate group polyoxyethylene glycol under the effect of catalyst dibutyltin dilaurylate; The mol ratio of described methoxy poly (ethylene glycol) and vulcabond is 1:5 ~ 1:100, and the add-on of dibutyl tin laurate is 1% of reactant total mass, and the concentration of methoxy poly (ethylene glycol) in reaction system is 0.03mol/L ~ 0.1mol/L; Temperature of reaction is 25 DEG C ~ 60 DEG C, and the reaction times is 4 ~ 24h;

(2) be equipped with reflux condensing tube, dry and in the Schlenk bottle of nitrogen pump drainage 3 times, add terminal hydroxy group functionalization isotatic polypropylene, terminal isocyanate group polyoxyethylene glycol, organic solvent and catalyst dibutyltin dilaurylate successively; There is nucleophilic addition in terminal isocyanate group polyoxyethylene glycol and terminal hydroxy group functionalization isotatic polypropylene, obtain isotatic polypropylene-b-polyoxyethylene glycol two block thing under the effect of catalyst dibutyltin dilaurylate; The terminal hydroxyl of terminal hydroxy group isotatic polypropylene and the mol ratio of terminal isocyanate group polyoxyethylene glycol are 1:1 ~ 1:10, the add-on of dibutyl tin laurate is 1% ~ 5% of reactant total mass, and the concentration of terminal hydroxy group isotatic polypropylene in reaction system is 0.03mol/L ~ 0.1mol/L; Temperature of reaction is 90 DEG C ~ 130 DEG C, and the reaction times is 4 ~ 24h; Described organic solvent is toluene, dimethylbenzene, heptane, octane or its any mixture.

3. method according to claim 2, is characterized in that, described methoxy poly (ethylene glycol) is thread-like molecule, and its molecular weight is 350 ~ 5300g/mol, and molecular weight distribution is 1.1 ~ 1.9.

4. method according to claim 2, is characterized in that, described terminal hydroxy group functionalization isotatic polypropylene number-average molecular weight is 3 ~ 15 × 10 ³g/mol, molecular weight distribution is 3 ~ 10.

5. method according to claim 2, is characterized in that, described vulcabond is hexamethylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate or diphenylmethanediisocyanate.