Journal
POLYMER DEGRADATION AND STABILITY
Volume 92, Issue 5, Pages 920-931Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2005.11.015
Keywords
poly(vinylbutyral); photochemical degradation; peroxides; crosslinking; discoloration
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Films of poly(vinylbutyral) (PVB) from two proprietary sources were tested for photochemical behavior upon exposure to UVB, UVA, BLB, and high-output '' daylight '' fluorescent (DLF) lamps. Discoloration and brittleness followed the buildup and subsequent decline of peroxide content. In the range of 60-89.9 degrees C, the onset of crosslinking and the loss of weight obeyed the Arrhenius relationship. At temperatures above the second-order-transition temperature, T-g, crosslinking predominated; at temperatures below T-g, chain breaking tended to prevail. (C) 2005 Elsevier Ltd. All rights reserved.
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