Thermal analysis study of the effect of molecular weight on constrained amorphous phase in poly(phenylene sulfide) |
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Authors: | Sharon Xin Lu Peggy Cebe |
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Affiliation: | (1) Department of Physics and Astronomy, Tufts University, Science and Technology Center, 02155 Medford, MA, USA;(2) Present address: Johnson and Johnson, Sommerville, New Jersey |
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Abstract: | We report a thermal analysis study of the effect of molecular weight on the amorphous phase structure of poly(phenylene sulfide), PPS, crystallized at temperatures just above the glass transition temperature. Thermal properties of Fortron PPS, having viscosity average molecular weights of 30000 to 91000, were characterized using temperature modulated differential scanning calorimetry (MDSC). We find that while crystallinity varies little with molecular weight, the heat capacity increment at the glass transition decreases as molecular weight decreases. This leads to a smaller liquid-like amorphous phase, and a larger rigid amorphous fraction, in the lower molecular weight PPS. For all molecular weights, constrained fraction decreases as the scan rate decreases.This research is supported by the U. S. Army Research Office through contract DAAH04-96-1-0009. The authors thank Hoechst Celanese for providing different molecular weight Fortron samples and Dr. George Collins for providing sample information. The authors acknowledge the assistance of Elizabeth Oyebode and Leonardo Grimaldi with sample preparation and MDSC work. |
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Keywords: | constrained amorphous phase modulated differential scanning calorimetry molecular weight poly(phenylene sulfide) |
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