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January 24, 2010 | History

Photodegradation and photostabilization of ultra violet weathered wood flour high density polyethylene composites 1 edition

Photodegradation and photostabilization of ultra violet weathered wood ...
Muna Muasher

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Photodegradation and photostabilization of ultra violet weathered wood flour high density polyethylene composites.

Published 2005 .
Written in English.

About the Book

Wood Plastic Composites (WPC) have gained much acceptance in both the plastic processing and forest products industries in recent years. As the outdoor applications of WPC become more widespread, the color stability of these products against ultraviolet becomes a concern.The most effective formulation in stabilizing the overall color change was a combination of both high and low molecular weight diesters and a benzotriazole based UVA.Lignin experiences two competitive redox reactions namely oxidation to chromophores (which causes yellowing) and reduction of chromophores to hydroperoxides (which causes photobleaching).ToF-SIMS analysis revealed that High Density Polyethylene (HDPE) undergoes photodegradation according to Norrish Type I reaction after UV exposure. FTIR spectroscopy revealed that the HDPE undergoes two competitive reactions namely chain scission and crosslinking.In the present work, the performance of different photostabilizers was investigated. Furthermore, a reaction mechanism for the changes in surface chemistry of the UV weathered WPC was proposed.

Edition Notes

Source: Masters Abstracts International, Volume: 44-02, page: 0913.

Thesis (M.Sc.F.)--University of Toronto, 2005.

Electronic version licensed for access by U. of T. users.

GERSTEIN MICROTEXT copy on microfiche (2 microfiches).

The Physical Object

Pagination
127 leaves.
Number of pages
127

ID Numbers

Open Library
OL19217047M
ISBN 10
0494072954

History Created December 11, 2009 · 2 revisions Download catalog record: RDF / JSON

January 24, 2010 Edited by WorkBot add more information to works
December 11, 2009 Created by WorkBot add works page