Identification of new chemical structures in poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) irradiated in vacuum at different temperatures

被引：23

作者：

Lappan, U ^{[1
]}

Geissler, U ^{[1
]}

Scheler, U ^{[1
]}

Lunkwitz, K ^{[1
]}

机构：

[1] Inst Polymer Res Dresden, D-01069 Dresden, Germany

来源：

RADIATION PHYSICS AND CHEMISTRY | 2003年 / 67卷 / 3-4期

关键词：

fluoropolymer; PFA; irradiation; solid-state NMR; IR;

D O I：

10.1016/S0969-806X(03)00083-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electron beam irradiation of perfluorinated copolymer poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) was carried out in vacuum at different temperatures between room temperature and temperature above the melting point of PFA. Changes of chemical structure were studied by F-19 solid-state NMR and IR spectroscopy. Chain scissions and branching reactions occur simultaneously, which are indicated by formation of CF3, COF and COOH end groups, CF branching points and CF3 side groups. Branching density based on concentration of CF groups increases with increasing temperature. Formation of cross-links is concluded for PFA irradiated in molten state. Perfluoropropyl vinyl ether (PPVE) units are found to be more sensitive to radiation than tetrafluoroethylene units. COF and COOH groups are assumed to result from PPVE degradation. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：447 / 451

页数：5

共 12 条

[1] Electron beam facility in polymer research: radiation induced functionalization of polytetrafluoroethylene [J].