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合成了超支化聚苯乙烯-线型聚苯乙烯-超支化聚甲基丙烯酸甲酯三嵌段聚合物(HPS-b-LPS-b-HPMMA).首先分别合成了带有炔基和溴的三硫代碳酸酯(ATC和BTC),然后通过苯乙烯(St)的可逆加成-断裂链转移(RAFT)聚合,制得端炔基和端基溴的线型聚苯乙烯大分子RAFT试剂,然后将大分子RAFT试剂的溴末端转化为叠氮末端.接着在大分子RAFT试剂存在情况下,通过自缩合原子转移自由基共聚合(SCATRCP)分别制得端炔基超支化聚苯乙烯-线型聚苯乙烯(HPS-b-LPS)和端叠氮基超支化聚甲基丙烯酸甲酯-线型聚苯乙烯(HPMMA-b-LPS)两嵌段聚合物.最后将两种两嵌段聚合物通过点击(click)反应偶合,得到不对称的超支化-线型-超支化三嵌段聚合物HPS-b-LPS-b-HPMMA.核磁共振氢谱(1H NMR)、凝胶渗透色谱(GPC)结果表明,所得产物分子量可控,得到了预期结构的聚合物.
Hyperbranched polystyrene-linear polystyrene-hyperbranched poly (methyl methacrylate) triblock polymer (HPS-b-LPS-b-HPMMA) was synthesized.At the same time, Trithiocarbonate (ATC and BTC) and then polymerized by reversible addition-fragmentation chain transfer (RAFT) of styrene (St) to prepare linear polystyrene macromolecular RAFT reagents of terminal alkynyl and terminal bromine , And then the bromine end of macromolecule RAFT reagent was converted into azide end.And then in the presence of macromolecular RAFT reagent, the alkynyl hyperbranched polystyrene- Linear polystyrene (HPS-b-LPS) and azido-terminated hyperbranched poly (methyl methacrylate) -line polystyrene (HPMMA-b-LPS) The asymmetric hyperbranched-linear hyperbranched triblock polymer, HPS-b-LPS-b-HPMMA, was obtained by the click reaction of the segmented polymer.H NMR, gel permeation Chromatography (GPC) results show that the molecular weight of the resulting product can be controlled to obtain the desired structure of the polymer.