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Novel UV absorbers prepared from 2,4‐dihydroxybenzophenone and hexachlorocyclotriphosphazene
Author(s) -
Inoue Kenzo,
Takahata Hiroaki,
Tanigaki Teiichi
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070501101
Subject(s) - polystyrene , moiety , thermogravimetric analysis , phosphazene , differential scanning calorimetry , polymer chemistry , diffusion , chemistry , nuclear chemistry , polymer , organic chemistry , physics , thermodynamics
The UV‐stabilizing ability and thermal loss from the polystyrene film of novel UV absorbers, 2‐[(3‐hydroxy‐4‐benzoyl) phenoxy] pentachlorocyclotriphosphazene (HBPC) and hexakis[ (2‐hydroxy‐4‐benzoyl) phenoxy] cyclotriphosphazene (HBPP), were investigated. The UV‐stabilizing ability of HBPC estimated by the formation of carbonyl groups in polystyrene was comparable to that of 2,4‐dihydroxybenzophenone (DHB), suggesting that the phosphazene moiety does not affect the efficiency of the stabilizing ability of DHB units. No significant difference of efficiency per stabilizing units between HBPC and HBPP was observed. HBPC and HBPP are noteworthy for their low thermal losses from the polystyrene film, i.e., the thermal loss of HBPP was completely suppressed and the diffusion coefficient of HBPC at 160°C was two orders of magnitude smaller than that of DHB. The thermogravimetric analysis and differential scanning calorimetry measurement showed that HBPC and HBPP are nonvolatile and stable up to 230 and 300°C, respectively. © 1993 John Wiley & Sons, Inc.