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

Ramachandra, P. and Ramani, R. and Ramgopal, G. and Shariff, G. and Thimmegowda, M. C. and Sathyanarayana, P. M. and Ranganathaiah, C. (1999) Influence of strain on the thermal behaviour of poly(chlorotrifluoroethylene). POLYMER INTERNATIONAL, 48 (1). pp. 33-40.

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The effects of uniaxial drawing on the free volume of poly(chlorotrifluoroethylene) 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 influence 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 film and a negative thermal expansion beyond the glass transition temperature, supported by an increase in activation energy for the strained polymer. (C) 1999 Society of Chemical Industry.

Item Type: Article
Uncontrolled Keywords: poly(chlorotrifluoroethylene); positron lifetime; free volume; critical strain; activation energy
Subjects: Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: Users 13 not found.
Date Deposited: 24 Apr 2013 08:49
Last Modified: 15 May 2013 07:10

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