红外光谱法测定溶聚丁苯橡胶硫化胶的微观结构

Determination of Microstructure of SSBR Vulcanizate by Infrared Spectroscopy

研究在氮气保护下,用邻二氯苯回流煮沸分解硫化胶,采用红外光谱(IR)法测定不同牌号溶聚丁苯橡胶(SSBR)并用胶、顺丁橡胶(BR)/SSBR并用胶和天然橡胶(NR)/SSBR并用胶的1,2-乙烯基和苯乙烯质量分数。结果表明:对于SSBR5251/SSBR6361并用胶和BR/SSBR并用胶,IR法与核磁共振(NMR)法的测定结果之间呈现良好的线性关系;而对于NR/SSBR并用胶,IR法与NMR法的测定结果之间不具备相关性。

In this study,the vulcanizates of the blends of different grades of solution polymerized styrene butadiene rubber(SSBR),blends of cis polybutadiene rubber(BR)and SSBR,and blends of natural rubber(NR)and SSBR were decomposed in the boilingo-dichlorobenzene under nitrogen,and the mass fraction of 1,2-vinyl and styrene units in the vulcanizates were determined with the sample from decomposition by using infrared spectroscopy(IR).The results showed that for SSBR5251/SSBR6361 blends and BR/SSBR blends,there was a good linear relationship between IR and nuclear magnetic resonance(NMR) test results;but for NR/SSBR blends,there was no correlation between IR and NMR test results.