低相对分子质量端羟基丁苯橡胶的合成、表征及应用

Synthesis,characterization and application of hydroxyl-terminated poly(butadiene-styrene) rubber with low relative molecular mass

采用自由基溶液聚合法合成了低相对分子质量端羟基聚丁二烯-苯乙烯橡胶(HTBS),通过傅里叶变换红外光谱表征了HTBS的微观结构,并研究了用其制得聚合物材料的力学性能。结果表明,采用部分连续加入引发剂方式制备的HTBS分子量分布较窄;当HTBS的结合苯乙烯质量分数为16%～26%时,顺式-1,4-结构和反式-1,4-结构质量分数为53%～61%,1,2-结构质量分数为20%～24%;由HTBS制得的聚氨酯弹性体和聚氨酯防水涂料具有较好的力学性能,另外HTBS可有效提高聚苯乙烯树脂的扯断伸长率。

The hydroxyl-terminated poly（butadiene-styrene） rubber（HTBS） with low relative molecular mass was prepared by radical solution polymerization,the microstructure of HTBS was characterized by Fourier transform infrared spectroscopy,and the mechanical properties of polymer materials prepared with HTBS was studied.The results showed that the molecular weight distribution of HTBS was narrow by partly continuous adding mode of initiator.Mass fration of cis-1,4-unit and trans-1,4-unit in HTBS was 53%-61%,and 1,2-units 20%-24% when mass fraction of bound styrene in HTBS was 16%-26%.The polyurethane elastomer and polyurethane waterproof material prepared with HTBS exhibited good mechanical properties,and HTBS could improve the elongation at break of polystyrene resin.