The present work deals with changes in the number average molecular weight (M n) of PTFE irradiated at different temperatures. A decrease in M n was observed and attributed to the scission of polymer chains. On the other hand, it was also observed that M n decreased to a minimum value with increasing irradiation dose and then increased; the doses at which the minimum value of M n occurs are temperature dependent. The increase is explained as being due to crosslinking reactions occurring during the irradiation of PTFE.
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Zhong et al. (1990) studied this question.
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