Influence of Gamma-Irradiation and Thermal Annealing on Molecular-Topological Structure of Tetrafluoroethylene-Ethylene Copolymer

摘要

The molecular-topological structure of a tetrafluoroethylene copolymer with ethylene after gamma-irradiation and thermal annealing has been studied. The pseudo-network structure of the copolymer contains, in addition to the amorphous block, crystalline segments of macromolecules in the role of branching sites. Topologically, the diblock structure of the copolymer after thermal annealing at 538 K is transformed into a three-block structure with the appearance of a high-temperature amorphous block. Irradiation of the copolymer with gamma-rays to a dose of 150 kGy does not lead to appreciable changes in its molecular-topological structure.