Paul Start
Intel Corporation, NA, Department Member
The primary application for CNT composites is the enhancement of their electrical properties relative to pure polymers. The conductivity is controlled by the alignment and the dispersion of the nanotubes in the polymer matrix during... more
The primary application for CNT composites is the enhancement of their electrical properties relative to pure polymers. The conductivity is controlled by the alignment and the dispersion of the nanotubes in the polymer matrix during processing. Understanding the interplay between conductivity, processing, alignment and rheology is key their efficient use. We present simultaneous measurements of the Rheology and conductivity of molten polymer nanotube composites over a range of concentrations near the percolation threshold. We find that simple shear fields can change the conductivity by orders of magnitude. Surprisingly, upon cessation of shear, the conductivity returns to its quiescent value.
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Page 1. POLYMERS FOR ADVANCED TECHNOLOGIES Polym. Adv. Technol. 2005; 16: 249256 Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/pat.576 Monitoring the relaxation behavior of nylon/clay ...
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Dielectric and optical transmission measurements obtained during processing of polymer/clay composites yielded quantitative information about the extent of clay exfoliation in the polymer matrix. Measurements were made using an... more
Dielectric and optical transmission measurements obtained during processing of polymer/clay composites yielded quantitative information about the extent of clay exfoliation in the polymer matrix. Measurements were made using an instrumented slit die that was situated at the exit of a twin screw extruder. Nylon 6, 11 and 12 resins were compounded with several organo modified montmorillonite clays. Dielectric and optical
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Research Interests:
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Silicon-methoxide-containing modified clays were obtained through cationic exchange between the sodium clay and the ammonium cation of [3-(trimethoxysilyl) propyl] octadecyldimethylammonium chloride (Si18). The nanocomposites were... more
Silicon-methoxide-containing modified clays were obtained through cationic exchange between the sodium clay and the ammonium cation of [3-(trimethoxysilyl) propyl] octadecyldimethylammonium chloride (Si18). The nanocomposites were prepared ...