The reaction kinetics and mechanism of crude fluoroelastomer vulcanized by direct fluorination with fluorine/nitrogen gas

被引：14

作者：

Fan, Cong ^{[1
]}

Li, Baoyin ^{[1
]}

Ren, Mengmeng ^{[1
]}

Wu, Peng ^{[1
]}

Liu, Yang ^{[1
]}

Chen, Teng ^{[1
]}

Cheng, Zheng ^{[1
]}

Qin, Jiaqiang ^{[1
]}

Liu, Xiangyang ^{[1
]}

机构：

[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat & Engn, Chengdu 610065, Peoples R China

来源：

RSC ADVANCES | 2015年 / 5卷 / 24期

基金：

中国国家自然科学基金;

关键词：

FLASK COMBUSTION METHOD; SOLID REACTION; REACTION MODEL; RUBBER; FLUOROPOLYMER; PHASE; COAL;

D O I：

10.1039/c4ra15096a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A novel vulcanization method for crude fluoroelastomer by direct fluorination with fluorine/nitrogen gas has been investigated. The results show that the vulcanization reaction of fluoroelastomer is closely related with fluorination temperature, fluorination time and fluorine gas partial pressure. The maximum crosslink degree can be up to 97%, and the fluorine content of fluoroelastomer increased from 48.2% to 60% during the fluorination. The static friction coefficient of fluoroelastomer is decreased from 0.91 to 0.55, which is about 39.6% reduction after fluorination. The ATR-FTIR spectra indicate the crosslink reaction process of fluoroelastomer by direct fluorination, which arises from three reaction stages and successively goes through four elementary reactions: substitution reaction; elimination reaction; addition reaction; crosslink reaction. The increase of fluorine content takes place mainly in the first stage, and the crosslink reaction takes place mainly in the second stage and third stage.

引用

页码：18932 / 18938

页数：7

共 25 条

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