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首页> 外文期刊>journal of applied polymer science >Novel UV absorbers prepared from 2,4‐dihydroxybenzophenone and hexachlorocyclotriphosphazene
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Novel UV absorbers prepared from 2,4‐dihydroxybenzophenone and hexachlorocyclotriphosphazene

机译：Novel UV absorbers prepared from 2,4‐dihydroxybenzophenone and hexachlorocyclotriphosphazene

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AbstractThe 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) phenoxycyclotriphosphazene (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. © 199

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