[article]
| Titre : |
Photodegradation of polymers, relevance for coating chemist |
| Type de document : |
texte imprimé |
| Auteurs : |
Gurpreet Onkar Singh, Auteur ; V. C. Malshe, Auteur |
| Année de publication : |
2010 |
| Article en page(s) : |
p. 111-124 |
| Langues : |
Anglais (eng) |
| Catégories : |
Matières plastiques -- Détérioration
Oxydation
Photodétérioration
Polymères -- Détérioration
Radicaux libres (chimie)
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The ageing of plastics, polymers and resins leads to several possibilities. Several oxidation products are formed. Free radicals, produced by formation of peroxides, lead to depolymerization, crosslinking, chain termination to polymer leading to chain branching and reversal to monomers in specific cases. Completely new small molecules those were not present at the time of polymerization are formed contributing to volatile organics over the useful life of the product and beyond it. When wa have a look at the literature on the subject of photodegradation of polymers, the polymer chemist dealing with bulk polymers seem to have worried about it far more than the paint and coatings chemist. The reasons are mainly environmental. The used plastic products are posing a great threat to the environment and efforts have been made to delibarately accelerate the process of photodegradation of polymers in ordinary sunlight. A paint and coating chemist can learn a lot from these developments, particularly "what not to do" to enhance the life of his products. Transition metals are regularly used to achieve various objectives by paint and coating chemist. There is a completely new dimension of their involvement in the degradation of polymers by photodegradation mechanism. This review is aimed at the spreading the information to the paints and coatings technologists. There is an increasing concern by government, NGOs and EU institutions about huge problems posed by letter and waste. Plastic products are significant contributors to these problems. The various additives, structural changes produced by oxidation assisted by light have been reviewed. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9391 |
in PAINTINDIA > Vol. LX, N° 3 (03/2010) . - p. 111-124
[article]
|
Aller sur edunet
Accueil
Photodegradation of polymers, relevance for coating chemist in PAINTINDIA, Vol. LX, N° 3 (03/2010)
