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Heteroarm core cross-linked star polymers via RAFT copolymerization of styrene and bismaleimide

机译:通过苯乙烯和双聚酰亚胺的筏共聚杂体核心交联星聚合物

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摘要

We explored reversible addition-fragmentation chain transfer (RAFT) copolymerization of 1,2-bis(maleimidoethane) (BMI) with styrene (S) in the presence of polylactide macro-chain transfer agent (PLA-CTA) as a means to synthesize heteroarm core cross-linked star (CCS) polymers consisting of PLA and PS arms (PLA(n)PS(n)). Because of the strong alternating tendency of maleimide and styrenic double bonds, copolymerization of BMI with an excess of S depleted BMI in the early stage of polymerization forming a cross-linked core. The remaining S was successively polymerized to grow PS arms from the core, completing PLA(n)PSn via "in-out" mechanism. Use of a stoichiometric amount of S produced PLA(n), which could be used as a macro-CTA for the synthesis of more well-defined PLA(n)PSn. Compared with divinylbenzene, copolymerization of BMI with S was much more effective for core formation suggesting the importance of the alternating character of the copolymerization. While PLA(n)PSn existed as stable nanoparticles in a neutral solvent in contrast to linear PLA-b-PS, it also self-assembled to form microphase-separated structures in a selective solvent and in bulk indicating that PLA and PS arms can be intramolecularly segregated.
机译:我们探讨了苯乙烯大规模转移剂(PLA-CTA)存在于苯乙烯的苯乙烯作为合成异质的手段的苯乙烯(S)与苯乙烯的可逆附加 - 碎片链转移(BMI)共聚合由PLA和PS臂组成的核心交联星(CCS)聚合物(PLA(n)ps(n))。由于马来酰亚胺和苯乙烯类双键的强交替倾向,BMI的共聚在聚合的早期具有过量的S贫化BMI形成交联芯。剩余的S连续聚合以使PS臂从核心生长,通过“外出”机制完成PLA(N)PSN。使用化学计量的S产生的PLA(n),其可以用作合成更明确的PLA(n)PSN的宏CTA。与二乙烯基苯相比,BMI的共聚合对于核心形成更有效,表明共聚特征的重要性。虽然PLA(n)psn存在于与线性PLA-BS相反的中性溶剂中的稳定纳米颗粒,但它也自组装以在选择性溶剂中形成微相分离的结构,并在块状中表明PLA和PS臂可以是可以的分子分子间隔。

著录项

  • 来源
    《RSC Advances》 |2016年第53期|共8页
  • 作者

    Ahn Nam Young; Seo Myungeun;

  • 作者单位

    Korea Adv Inst Sci &

    Technol Grad Sch Nanosci &

    Technol Daejeon 34141 South Korea;

    Korea Adv Inst Sci &

    Technol Grad Sch Nanosci &

    Technol Daejeon 34141 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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