Synthesis of amphiphilic block copolymers via ring opening polymerization and reversible addition‐fragmentation chain transfer polymerization,Journal of Polymer Science

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Synthesis of amphiphilic block copolymers via ring opening polymerization and reversible addition‐fragmentation chain transfer polymerization
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-11-30 , DOI: 10.1002/pol.20200719
Patrizia P. Smith ₁ , Stephen G. Boyes ₂

Affiliation

Amphiphilic block copolymers were synthesized via a dual initiator chain transfer agent (inifer) that successfully initiated the ring opening polymerization (ROP) of l‐lactide (LLA) and subsequently mediated the reversible addition‐fragmentation chain transfer (RAFT) polymerization of poly(ethylene glycol) ethyl ether methacrylate (PEGEEMA). The formation of each polymer block was confirmed using ¹H nuclear magnetic resonance spectroscopy, as well as gel permeation chromatography, and comprehensive kinetics studies provide valuable insights into the factors influencing the synthesis of well‐defined block copolymers. The effect of monomer concentration, reaction time, and molar ratios of inifer to catalyst on the ROP of LLA are discussed, as well as the ability to produce poly(lactide) blocks of different molecular weights. The synthesis of hydrophilic PPEGEEMA blocks was also monitored via kinetics to provide a better understanding of the role the chain transfer agent plays in facilitating the complex and sterically demanding RAFT polymerization of PEGEEMA.

中文翻译：

通过开环聚合和可逆加成-断裂链转移聚合合成两亲嵌段共聚物

两亲性嵌段共聚物通过双引发剂的链转移剂（引发转移剂）合成的成功启动开环聚合的（ROP）升-丙交酯（LLA），随后介导的可逆加成-断裂链转移（RAFT）聚聚合（乙烯乙二醇）甲基丙烯酸乙酯（PEGEEMA）。使用¹确认每个聚合物嵌段的形成H核磁共振波谱，凝胶渗透色谱和全面的动力学研究为影响定义明确的嵌段共聚物合成的因素提供了宝贵的见解。讨论了单体浓度，反应时间和引发剂与催化剂的摩尔比对LLA ROP的影响，以及产生不同分子量聚丙交酯嵌段的能力。亲水性PPEGEEMA嵌段的合成也通过动力学进行了监测，以更好地理解链转移剂在促进PEGEEMA复杂且空间上要求RAFT聚合中所起的作用。

更新日期：2021-01-02

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