衰减全反射红外光谱法测定溶聚丁苯橡胶的微观结构

摘要

以溶聚丁苯橡胶(SSBR)为标准试样,通过涂膜红外光谱(IR)法确定了4种牌号(2557 S、2564、3840、553)SSBR微观结构含量的标称值,采用衰减全反射(ATR)-IR法测定了SSBR的微观结构含量,并与核磁共振(NMR)法测试结果进行了对比.结果表明,4种牌号SSBR标准试样的反式-1,4-结构、乙烯基结构、顺式-1,4-结构和苯乙烯结构的标称值(质量分数)分别为17.2％、15.8％、25.2％、19.5％,42.0％、37.6％、12.6％、42.6％,23.4％、20.4％、23.6％、23.1％,17.4％、26.1％、38.6％、14.8％.当平整光滑的试样厚度不大于2 mm时测试结果有较好的重复性,ATR-IR法测试结果与NMR法无显著性差异,准确性得到验证.%Coating infrared spectrum (IR) method was used to determine the nominal value of microstructure content of four kinds of solution-polymerized styrene-butadiene rubber (SSBR,brand of 2557 S、2564、3840、553) as the standard sample.The microstructure content of SSBR were determined by attenuated total reflection IR (ATR)-IR method,and the results were compared with those measured by nuclear magnetic resonance(NMR) method.The results showed that nominal values of trans-1,4-unit,vinyl-unit,cis-1,4-unit and styrene-unit of four kinds of SSBR were 17.2％,15.8％,25.2％,19.5％;42.0％,37.6％,12.6％,42.6％;23.4％,20.4％,23.6％,23.1％;17.4％,26.1％,38.6％,14.8％ respectively.When the thickness of smooth sample was less than 2 mm,the test result had good repeatability.The results measured by ATR-IR method showed no significant difference with those by NMR method,and the accuracy had been verified.