以端羟基聚丁二烯(HTPB)为引发剂,在三氟化硼乙醚(BF3· OEt2)的催化作用下,利用四氢呋喃(THF)的阳离子开环聚合制备PTHF-PB-PTHF三嵌段共聚物.利用红外光谱、核磁氢谱、碳谱及凝胶渗透色谱-激光光散射联用仪证实了其大分子结构与分子设计一致且相对分子质量可控.聚合工艺研究表明,催化剂用量对聚合反应的影响较小,嵌段共聚物相对分子质量随单体与引发剂配比的增大而提高.利用热重分析仪及差示扫描热分析研究了聚合产物的热稳定性及低温玻璃化转变行为,结果表明,产物具有较好的热稳定性,其玻璃化转变温度可达-80℃以下.
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