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Photochemical Degradation Study of Polyurethanes as Relic Protection Materials by FTIR‐ATR
Author(s) -
Wang LiQin,
Liang GuoZheng,
Dang GaoChao,
Wang Fang,
Fan XiaoPan,
Fu WenBin
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200591257
Subject(s) - polyurethane , fourier transform infrared spectroscopy , chemistry , attenuated total reflection , degradation (telecommunications) , photochemistry , polymer chemistry , isocyanate , infrared spectroscopy , chemical engineering , organic chemistry , telecommunications , computer science , engineering
Polyurethanes are one kind of relic protection materials commonly used. During artificial photo‐ageing, three polyurethanes, HDI‐based polyurethane, MDI‐based polyurethane and TDI‐based polyurethane, have been considered to undergo UV radiation. Photochemical degradation of the polyurethanes has been monitored by means of Fourier transform infrared spectroscopy with attenuated total reflection accessory (FTIR‐ATR). It was proved that the mechanism of the photochemical degradation of polyurethanes might be the scissions of carbamate (urethane) groups and the re‐reactions of radical groups formed in the scission reactions. From the experiment results HDI‐based polyurethane, an aliphatic diisocyanate, could be considered to be more suitably used as relic protection materials among these three polyurethanes for its ageing products with less color.