Correlation between the crossover modulus and the molecular weight distribution using the Doi-Edwards theory of reptation and the Rouse theory |
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Authors: | R. R. Rahalkar |
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Affiliation: | (1) Polysar Limited, N7T 7M2 Sarnia, Ontario, Canada |
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Abstract: | The crossover modulus in the dynamic mechanical spectrum was linked with the molecular weight distribution (MWD) over a wide range of polydispersity ( = 1 to 6). Reasonable agreement was obtained between theory and experiment for near monodisperse and narrow MWD polymers using the Doi-Edwards theory of reptation. For broad MWD polymers, the Doi-Edwards theory was found to be inapplicable. Using the Doi-Edwards theory for the shorter chains and a Rouse type mechanism for the longer chains, a good fit was obtained between the calculated and experimentally measured crossover modulus values. |
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Keywords: | Crossover modulus molecular weight distribution Doi-Edwards theory Rouse theory |
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