Photochemical deterioration of poly(vinylbutyral) in the range of wavelengths from middle ultraviolet to the visible |
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| Authors: | Robert L. Feller Mary Curran Val Colaluca Catherine Bailie |
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| Affiliation: | a Art Conservation Research Center, Carnegie Mellon University, 700 Technology Drive, Pittsburgh, PA 15219, USA
b Department of Horticulture, Penn State University, University Park, PA 16802, USA |
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| Abstract: | 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 °C, the onset of crosslinking and the loss of weight obeyed the Arrhenius relationship. At temperatures above the second-order-transition temperature, Tg, crosslinking predominated; at temperatures below Tg, chain breaking tended to prevail. |
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| Keywords: | Poly(vinylbutyral) Photochemical degradation Peroxides Crosslinking Discoloration |
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