Influence of vinylidenefluoride on the physical ageing of poly(chlorotrifluoroethylene)

Ranganathaiah, C. and Ramani, R. and Ramachandra, P. (2002) Influence of vinylidenefluoride on the physical ageing of poly(chlorotrifluoroethylene). European Polymer Journal, 38 (11). 2285 - 2294. ISSN 1873-1945

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The influence of vinylidenefluoride (3 composition) on the physical ageing of poly(chlorotrifluoroethylene) at 70 °C has been investigated using the positron annihilation lifetime technique. Both the ortho-positronium (o-Ps) pick-off lifetime and its intensity show a systematic variation with ageing time. The o-Ps intensity exhibits non-exponential character which can be fitted with two additive exponential decay curves and the free volume is found to exhibit the Doolittle type of free volume relaxation. The relaxation times were evaluated from the structural relaxation function and the non-exponentiality parameter was estimated using the Kohlrausch–Williams–Watts (KWW) function, which indicates the deviation from exponential relaxation. Based on the relaxation times, the activation energies calculated seems to label the different kinetic units/irregularity in the chain backbone of PCTFE structure participating in the relaxation process. Physical ageing seems to yield close packing of polymer chains.

Item Type: Article
Uncontrolled Keywords: Physical ageing, Positron lifetime, Poly(chlorotrifluoroethylene), Structural relaxation
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: Manjula P Library Assistant
Date Deposited: 20 Sep 2019 06:05
Last Modified: 20 Sep 2019 06:05

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