The kinetics and mechanism of the direct fluorination of polyethylenes

被引：41
|
作者：
Kharitonov, AP [1 ]
Taege, R
Ferrier, G
Piven, NP
机构：
[1] Russian Acad Sci, Inst Energy Problems, Chem Phys Branch, Chernogolovka 142432, Moscow Region, Russia
[2] Air Prod GmbH, Fluorine Technol, D-45523 Hattingen, Germany
[3] Air Prod PLC, COE Packaged Gases, Crewe CW1 6BT, Cheshire, England
来源：
SURFACE COATINGS INTERNATIONAL PART B-COATINGS TRANSACTIONS | 2005年 / 88卷 / 03期
关键词：
direct fluorination; polyethylene; fluorinated layer; kinetics; mechanism;
D O I：
10.1007/BF02699574
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Two types of low-density polyethylene (LOPE), five types of high-density polyethylene (HOPE), poly(vinyl fluoride) (PVF) and poly(vinylidene fluoride) (PVDF) were studied. The fluorination of LOPE and HOPE is a diffusion-controlled process and proceeds via a branched chain mechanism following an induction period. Initiation of the reaction takes place via the reaction of molecular fluorine with the C-H bond. The rate of fluorination of HOPE exceeds that of LOPE. PVDF cannot be fluorinated even at temperatures as high as 430K and/or under UV irradiation. The kinetics associated with the formation and termination of peroxy RO2center dot and fluorocarbon long-lifetime radicals was studied. It is mainly middle peroxy radicals that are formed at treatment conditions close to those used in industrial processes.
引用
收藏
页码：201 / 212
页数：12
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