4.7 Article

Photochemical deterioration of poly (vinylbutyral) in the range of wavelengths from middle ultraviolet to the visible

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POLYMER DEGRADATION AND STABILITY
卷 92, 期 5, 页码 920-931

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ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2005.11.015

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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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