论文部分内容阅读
通过自由基型聚合反应,制备了具有两种共聚链段组成的多重嵌段共聚物。首先,以自由基型聚引发剂采用本体聚合方法,制得了含偶氮基团的聚(苯乙烯—CO—丁二烯),降解后测定其嵌段链长。再在苯乙烯/丙烯腈单体存在下,分解剩余的偶氮基团,结果生成聚[(苯乙烯—CO—丁二烯)—block—(苯乙烯—CO—丙烯腈)]。动态力学分析和电镜观察表明了其具有两相组织形态。依据苯乙烯/丁二烯对苯乙烯/丙烯腈的嵌段分数比,制得了具有热塑性弹性的聚(苯乙烯—CO—丁二烯)或者高冲击聚(苯乙烯—CO—丙烯睛)。热塑性弹性体的蠕变性能可以间断的松弛时间来描述。从AMoney—Rivlin方程式作图,得到了物理交联点之间链段的分子量(Mc),其与化学分析所得结果相符。
By radical polymerization, a multiblock copolymer having two copolymerization segment compositions was prepared. First, azo-group-containing poly (styrene-co-butadiene) was obtained by a bulk polymerization method using a radical polymerization initiator, and its block length was measured after degradation. The remaining azo groups are then decomposed in the presence of a styrene / acrylonitrile monomer to produce poly [(styrene-CO-butadiene) -block- (styrene-CO-acrylonitrile)]. Dynamic mechanical analysis and electron microscopy showed that it has two-phase morphology. Depending on the block fraction ratio of styrene / butadiene to styrene / acrylonitrile, poly (styrene-CO-butadiene) or high-impact poly (styrene-co-acrylonitrile) with thermoplastic elasticity is produced. Creep properties of thermoplastic elastomers can be described in terms of relaxation time. From the AMoney-Rivlin equation, the molecular weight (Mc) of the segment between physical crosslinks was obtained, which was in good agreement with the results of chemical analysis.