共聚物
杰纳斯
高分子化学
原子转移自由基聚合
材料科学
单体
树枝状大分子
聚合
聚苯乙烯
开环聚合
自由基聚合
部分
苯乙烯
聚合物
化学
纳米技术
有机化学
复合材料
作者
Xiaoshan Fan,Khin Yin Win,Zhiguo Hu,Xian Jun Loh,Yupeng Liu
标识
DOI:10.1002/marc.201800217
摘要
Abstract In this work, an efficient strategy is designed for the precise synthesis of novel Janus star‐like copolymer (polystyrene) 8 ‐ b ‐(poly( l ‐lactide)) 8 , (PLLA) 8 ‐ b ‐(PS) 8 , consisting of two types of chemically distinct polymer arms, PS and PLLA, in an asymmetric structure. During the synthesis, PLLA hemisphere carrying protected hydroxyl groups at the focal point was first synthesized via a combined reactions of esterification, light‐induced “Click” chemistry, and ring opening polymerization (ROP) using a specially designed dendron as initiator. After removing the protecting moiety, the terminal hydroxyl groups on the dendron segment is increased fourfold and further modified into bromopropionate‐based macroinitiator through a two‐step end group transformation reaction, followed by atom transfer radical polymerization (ATRP) of styrene to obtain the desired (PLLA) 8 ‐ b‐ (PS) 8 Janus star‐like copolymer. The versatility and efficiency of the designed synthetic strategy are demonstrated by the well‐defined molecular characteristics and high yields of the targeted product. In addition to the controlled degradation behavior of the PLLA segments, the remaining bromide groups located at the distal end of PS arms could allow for further fabrication of diverse building blocks through consecutive ATRP of various monomers. This work signifies the first time for facile and precise synthesis of Janus star‐like copolymer with unique biphasic structure and function control.
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