Synthesis and characterization of hyperbranched polystyrene via click reaction of AB<sub>2</sub>
macromonomer
作者:Li-Zhi Kong、Miao Sun、Hua-Ming Qiao、Cai-Yuan Pan
DOI:10.1002/pola.23806
日期:2010.1.15
Well‐defined hyperbranched polystyrenes have been successfully prepared by polymerization of AB2 macromonomer, polystyrene containing an azide group at its one end and two terminal propargyl groups at the other end via click reaction. For preparation of AB2 macromonomers, an ATRP initiator, bispropargyl 2‐bromosuccinate (BPBS) with two propargyl groups and one bromine group was synthesized by the successive
良好定义的超支化聚苯乙烯已通过AB 2大分子单体的聚合反应成功制备,AB 2大分子单体的一端通过叠氮化物基团,另一端具有两个末端的炔丙基基团,通过点击反应进行聚合。为了制备AB 2大分子单体,通过L-天冬氨酸的连续溴化和酯化反应,合成了一种ATRP引发剂,具有两个炔丙基和一个溴基的双炔丙基2-溴琥珀酸酯(BPBS)。所得的BPBS引发了St的ATRP,随后(CH≡C)2 -PS-Brs的末端溴基团通过与叠氮化钠的反应被N 3取代,从而得到AB 2大分子单体(CH≡C)2分子量不同的‐PS‐N 3。所有中间体和所得聚合物均通过GPC,1 H NMR,FTIR和MALLS方法进行了表征。聚合动力学研究表明,聚合初期DP迅速增加,然后DP缓慢增加。最终的“ HyperMacs”具有高达M w的高分子量,MALLS = 340,000 g / mol,它们的分子量分布适度狭窄(M w / M n =