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. ISSN 0014-3057

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Isothermal annealing of poly(chlorotrifluoroethylene) (PCTFE) was carried out at a temperature of 70 °C (slightly above Tg) 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.

Item Type: Article
Additional Information: Unmapped bibliographic data: PY - 1997/10// [EPrints field already has value set] Y2 - 1997/12// [EPrints field already has value set] JO - European Polymer Journal [Field not mapped to EPrints]
Subjects: Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: ADMIN
Date Deposited: 01 Aug 2013 06:40
Last Modified: 03 Sep 2013 05:49

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