Modification of perfluorinated polymers by high-energy irradiation
作者： Klaus Lunkwitz , Uwe Lappan , Ulrich Scheler
DOI: 10.1016/J.JFLUCHEM.2004.01.020
关键词: Polymer 、 Inert gas 、 Vinyl ether 、 Surface modification 、 Polymer chemistry 、 Reactive extrusion 、 Polyamide 、 Branching (polymer chemistry) 、 Chemistry 、 Electron beam processing
摘要: Abstract This review surveys about the possibilities for modification of perfluorinated polymers using high-energy irradiation: degradation, functionalization, branching, and cross-linking. The reaction mechanisms different conditions are discussed. Electron irradiation polytetrafluoroethylene (PTFE) with a very high dose leads to complete degradation macromolecules low-molecular products. In presence oxygen perfluorocarboxylic acids in an inert atmosphere, mixtures olefins paraffins can be obtained. Virgin PTFE is disintegrated by air lower into micropowder modified COOH groups. powder homogeneously incorporated other polymers. So, special properties made effective these Micropowders functionalized groups polyamides (PA) form reactive extrusion PTFE-PA blockcopolymers which used as slide bearing materials. copolymers poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) irradiated show significantly higher degree functionalization compared PTFE. Irradiation molten atmosphere formation kinds double bonds, CF 3 side groups, long-chain branches well cross-links. PFA vacuum results generation COF groups; state also cross-links formed. focus present paper on work that has been carried out at Institute Polymer Research Dresden.
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