Physical ageing of poly(chlorotrifluoroethylene): A positron annihilation study

Ramachandra, P. and Ramani, R. and Ramgopal, G. and Ranganathaiah, C. (1997) Physical ageing of poly(chlorotrifluoroethylene): A positron annihilation study. European Polymer Journal, 33 (10-12). pp. 1707-1711.

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Isothermal annealing of poly(chlorotrifluoroethylene) (PCTFE) was carried out at a temperature of 70 degrees C (slightly above T-g) using the positron annihilation lifetime (PAL) technique. Both the o-Ps lifetime and intensity shows systematic variation with ageing time, and its intensity can be represented by two additive decay exponentials. The free volume which is estimated using the Nakanishi et al. equation developed from Tao's model, exhibits Doolittle type free volume relaxation. Physical ageing seems to yield close packing of polymer chains without crystallization. The relaxation time, and the nonexponentiality parameter, were estimated using a Kolrausch-Williams-Watt (KWW) function. (C) 1997 Elsevier Science Ltd.

Item Type: Article
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: Users 23 not found.
Date Deposited: 03 Jun 2021 06:49
Last Modified: 03 Jun 2021 06:49

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