| Titre : |
The kinetics and mechanism of the direct fluorination of polyethylenes |
| Type de document : |
texte imprimé |
| Auteurs : |
Alexander P. Kharitonov, Auteur ; Reiner Taege, Auteur ; Grant Ferrier, Auteur ; N. P. Piven, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 201-212 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cinétique chimique
Fluoration
Polyéthylène basse densité
Polyéthylène haute densité
Polyfluorure de vinyle
Polyfluorure de vinylidène
|
| Index. décimale : |
668.9 Polymères |
| Résumé : |
Two types of low-density polyethylene (LDPE), five types of high-density polyethylene (HDPE), poly(vinyl fluoride) (PVF) and poly(vinylidene fluoride) (PVDF) were studied. The fluorination of LDPE and HDPE 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 HDPE exceeds that of LDPE. 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 RO •2 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. |
| Note de contenu : |
- INTRODUCTION : Materials - Experimental
- RESULTS AND DISCUSSION : Kinetics of formation of a fluorinated layer - The relationship between fluorination and chemical composition : IR study - The relationship between fluorination and chemical composition - IR study - summary - The kinetics of formation of long-life radicals - Kinetics of the termination of long-lifetime radicals - The kinetics of elementary reactions - Summary - Preliminary schematic of the elementary reaction |
| DOI : |
10.1007/BF02699574 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/BF02699574.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5417 |
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B3 (09/2005) . - p. 201-212
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The kinetics and mechanism of the direct fluorination of polyethylenes in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)
