Electron irradiation effects on partially fluorinated polymer films: Structure-property relationships

Nasef, M.M. and Dahlan, K.Z.M. (2003) Electron irradiation effects on partially fluorinated polymer films: Structure-property relationships. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 201 (4). pp. 604-614. ISSN 0168583X

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Abstract

The effects of electron beam irradiation on two partially fluorinated polymer films i.e. poly(vinylidene fluoride) (PVDF) and poly(ethylene-tetrafluoroethylene) copolymer (ETFE) are studied at doses ranging from 100 to 1200 kGy in air at room temperature. Chemical structure, thermal and mechanical properties of irradiated films are investigated. FTIR show that both PVDF and ETFE films undergo similar changes in their chemical structures including the formation of carbonyl groups and double bonding. The changes in melting and crystallisation temperatures (Tm and Tc) in both irradiated films are functions of irradiation dose and reflect the disorder in the chemical structure caused by the competition between crosslinking and chain scission. The heat of melting (�Hm) and the degree of crystallinity (Xc) of PVDF films show no significant changes with the dose increase, whereas those of ETFE films are reduced rapidly after the first 100 kGy. The tensile strength of PVDF films is improved by irradiation compared to its rapid deterioration in ETFE films, which stemmed from the degradation prompted by the presence of radiation sensitive tetrafluoroethylene (TFE) comonomer units. The elongation at break of both films drops gradually with the dose increase indicating the formation of predominant crosslinked structures at high doses. However, the response of each polymer to crosslinking and main chain scission at various irradiation doses varies from PVDF to ETFE films. © 2003 Elsevier Science B.V. All rights reserved.

Item Type: Article
Additional Information: cited By 73
Uncontrolled Keywords: Chemical bonds; Crosslinking; Crystallization; Degradation; Deterioration; Electron beams; Electron irradiation; Fluorine; Mechanical testing; Melting; Structure (composition); Tensile strength; Thermal effects, Electron beam irradiation, Plastic films
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 09 Nov 2023 15:10
Last Modified: 09 Nov 2023 15:10
URI: https://khub.utp.edu.my/scholars/id/eprint/55

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