Determination of active HALS in weathered automotive paint systems I. Development of ESR based analytical techniques

被引：22
作者：
Kucherov, AV
Gerlock, JL
Matheson, RR
机构：
[1] Ford Motor Co, Ford Res Lab, Dearborn, MI 48121 USA
[2] DuPont Automot Finishes, Troy, MI 48007 USA
来源：
POLYMER DEGRADATION AND STABILITY | 2000年 / 69卷 / 01期
关键词：
D O I：
10.1016/S0141-3910(99)00173-1
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Two analytical techniques based on electron spin resonance spectroscopy have been developed to estimate the longevity of hindered amine light stabilizer (HALS) additives in clearcoat/basecoat paint systems at long exposure times. The first technique is based on determination of the steady-state concentration of nitroxyl radical in weathered clearcoats. The second one is based on determination of the concentration of clearcoat HALS transformations products that can be oxidized to nitroxyl radical by p-nitroperbenzoic acid in methylene chloride at 20 degrees C. The two techniques provide complimentary information. Both techniques are used to estimate HALS longevity in four weathered clearcoat/basecoat/primer/electrocoat automotive paint systems. (C) 2000 Elsevier Science Ltd. All rights reserved.
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页码：1 / 9
页数：9
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