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合成了超支化聚苯乙烯-线型聚四氢呋喃-超支化聚(甲基丙烯酸N,N-二甲胺基乙酯)三嵌段共聚物(HPS-b-LPTHF-b-HPDMAEMA)。首先分别以丙炔醇和2-溴乙醇引发四氢呋喃的阳离子开环聚合,然后得到的聚四氢呋喃(PTHF)末端的羟基用带有羧基的三硫代碳酸酯酯化,得到大分子RAFT试剂,并把溴端基用叠氮基取代。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分别制得端炔基HPS-b-LPTHF和端叠氮基HPDMAEMA-b-LPTHF两嵌段聚合物。最后将两种两嵌段聚合物通过点击反应偶联得到超支化-线型-超支化三嵌段共聚物HPS-b-LPTHF-b-HPDMAEMA。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 polytetrahydrofuran-hyperbranched poly (N, N-dimethylaminoethyl methacrylate) triblock copolymer (HPS-b-LPTHF-b-HPDMAEMA) was synthesized. Firstly, cationic ring-opening polymerization of tetrahydrofuran was initiated with propargyl alcohol and 2-bromoethanol, respectively, and then the hydroxyl group at the end of the obtained polytetrahydrofuran (PTHF) was esterified with trithiocarbonate having a carboxyl group to obtain a macromolecular RAFT reagent, Bromo end groups are substituted with azido groups. Then, alkynyl HPS-b-LPTHF and azido-terminated HPDMAEMA-b-LPTHF diblock polymer were prepared by self-condensation atom transfer radical copolymerization in the presence of macromolecular RAFT reagent. Finally, the two diblock polymers were coupled by click reaction to obtain the hyperbranched-linear-hyperbranched triblock copolymer HPS-b-LPTHF-b-HPDMAEMA. The results of 1H-NMR and GPC showed that the molecular weight of the obtained product was controlled and the polymer with the expected structure was obtained.