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Improved expression of the mean-square radius of gyration, 3. 1,4-polydienes

✍ Scribed by Zhiping Zhou; Deyue Yan

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 361 KB
Volume: 4
Category: Article
ISSN: 1022-1344
DOI: 10.1002/mats.1995.040040305

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✦ Synopsis

The mean-square radii of gyration of cisand trans-I ,4-polybutadiene and corresponding I ,4-polyisoprene were derived using Abe's and Flory's rotational isomeric scheme. Calculations performed using available experimental data showed that the dependence of the mean-square radius of gyration on the molecular weight for these stereoregular polydienes can be expressed as

where a and b are constants characteristic of the polymer. This behaviour is analogous to that of vinyl polymers and poly-l ,i-disubstituted ethylenes discussed in the preceding papers of the present series. The mean-square radius of gyration of 1 ,4-polyisoprene with predominantly trans units is more sensitive to stereoirregularity than with predominantly cis units. However, 1,4-polybutadiene chains are comparatively insensitive to the stereochemical composition.

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