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采用原子转移自由基聚合(ATRP)制备了α,ω-双溴功能化的聚苯乙烯,然后通过叠氮化、点击化学反应得到了α,ω-双醛功能化遥爪聚苯乙烯。作为对比,也采用一步法,即通过双溴聚苯乙烯末端Br与对羟基苯甲醛的亲核取代反应合成了双醛聚苯乙烯。通过叠氮化、点击化学两步反应合成分子量为2480g·mol-1的双醛聚苯乙烯,其末端醛基功能化率可达79%,与一步法相比,功能化率提高了54%。并且发现低分子量聚合物有利于末端功能化率的提高。
Α, ω-bis-brominated functionalized polystyrene was prepared by atom transfer radical polymerization (ATRP). Then α, ω-dialdehyde functionalized telechelic polystyrene was obtained by azidation and click chemistry. As a comparison, a one-step method was also used to synthesize the bis-substituted polystyrene by nucleophilic substitution reaction between bromodipyrene terminal Br and p-hydroxybenzaldehyde. The bisaldehyde polystyrene with a molecular weight of 2480g · mol-1 was synthesized by two steps of azide and click chemistry. The functionalization rate of terminal aldehyde was 79%, which was 54% higher than that of one-step reaction. And found that low molecular weight polymer is conducive to the terminal functionalization rate.