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Influence of strain on the thermal behaviour of poly(chlorotrifluoroethylene)

โœ Scribed by Ramachandra, P; Ramani, R; Ramgopal, G; Shariff, Gani; Thimmegowda, M C; Sathyanarayana, P M; Ranganathaiah, C

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
148 KB
Volume
48
Category
Article
ISSN
0959-8103

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โœฆ Synopsis

The eรพ ects of uniaxial drawing on the free volume of poly(chlorotriรฝuoroethylene) have been investigated using the positron annihilation lifetime technique. Annealing measurements were made both in unstrained and maximum strained conditions of the polymer to understand the inรฝuence of residual stress on the thermal behaviour. The results indicate uncoiling of the molecular chains upon stretching accompanied by orientation of the polymeric chains. The results further indicate an increase of the glass transition temperature of the drawn รผlm and a negative thermal expansion beyond the glass transition temperature, supported by an increase in activation energy for the strained polymer.

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