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Polystyrene was grafted onto FEP by simultaneous irradiation using a 60 Co γ-irradiator. Graft copolymers of different degree of grafting were obtained by varying the irradiation dose. Positron lifetime measurements were carried out on FEP and the grafted samples. A systematic decrease in o-Ps lifetime and intensity with grafting is seen indicating a decrease in pore size as well as total...
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