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Configurational-conformational entropy of 1,4-polydienes

✍ Scribed by Zhou, Zhiping ;Yan, Deyue ;Alfonso, Giovanni Carlo

Publisher
Wiley (John Wiley & Sons)
Year
1993
Weight
427 KB
Volume
2
Category
Article
ISSN
1018-5054

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✦ Synopsis

Abstract

A method based on matrix algebra and on the rotational isomeric state scheme to study the configurational‐ conformational entropy of 1,4‐polydienes with geometrical isomerism has been developed. Bernoullian and first‐and second‐order Markovian statistics for the sequences of cis and trans units along the chains have been considered, and the explicit relation between entropy and mole fraction of cis units has been derived. Calculations performed by using available experimental data for the configurational parameters and the conformational partition functions of 1,4‐polybutadiene and 1,4‐polyisoprene show that entropy is a monotonic function of the geometrical isomer composition. While the entropy of polybutadiene increases with the content of cis units, the reverse is true for polyisoprene.

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