负离子聚合法合成端羟基聚丁二烯与自由基法端羟基聚丁二烯的性能对比  

Comparison of properties of hydroxyl-terminated polybutadiene synthesized via anionic polymerization to free radical hydroxyl-terminated polybutadiene

作　　者：柏海见[1] 邓春华[1] 易建军[1] 陈继明[1] 齐永新[1] 潘广勤[1] 

机构地区：[1]中国石油兰州石化公司研究院,兰州730060

出　　处：《合成橡胶工业》2013年第3期172-175,共4页China Synthetic Rubber Industry

摘　　要：以硅烷保护羟基的烷基锂为引发剂,采用负离子聚合法合成了端羟基聚丁二烯(HTPB),通过核磁共振氢谱、傅里叶变换红外光谱、凝胶渗透色谱和差示扫描量热法表征了HTPB的微观结构、分子量分布、官能度及玻璃化转变温度(Tg),研究了HTPB胶片的拉伸性能,并与自由基法HTPB进行了对比。结果表明,负离子法HTPB的1,4-结构摩尔分数约为90%,比自由基法HTPB高约12%,分子量分布小于1.1,低于自由基法HTPB,平均官能度比自由基法HTPB更接近理想值2,Tg为-88.3℃,较自由基法HTPB低9.7℃;负离子法HTPB胶片的拉伸强度与自由基法HTPB胶片相近,但扯断伸长率比自由基法HTPB胶片提高约74%。Hydroxyl-terminated polybutadiene （ HTPB ） was synthesized via anionic polymerization using silane-protected hy-droxyl alkyllithium as initiator, the microstructures, molecular-weight distribution, functionality and glass-transition temperature （T） were characterized by Fourier transform infrared spectros-copy, ^1H-nuclear magnetic resonance, gel permeation chroma- tography and differential scanning calorimetry, the tensile prop-erty of HTPB films was studied, and compared with those of free radical HTPB. The results showed that the mole fraction of 1,4-unit in anionic HTPB reached 90% or so, 12% more than that in free radical HTPB, the molecular weight distribution （less than 1.1 ） was lower than that of the latter, the functionality was more closer to ideal value of 2 than that of the latter, Tg was about - 88.3 ℃, 9. 7 ℃ less than that of latter. The tensile strength of anionic HTPB film was close to that of free radical HTPB film, but the elongation at break increased by 74%.

关 键 词：负离子聚合法 自由基聚合法 端羟基聚丁二烯 微观结构 分子量分布 官能度 玻璃化转变温度 拉伸性能 

分 类 号：TQ316.324[化学工程—高聚物工业]