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首页> 外文期刊>Journal of the American Chemical Society >Polyurethanes and Polyallophanates via Sequence-Selective Copolymerization of Epoxides and Isocyanates
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Polyurethanes and Polyallophanates via Sequence-Selective Copolymerization of Epoxides and Isocyanates

机译:通过环氧化物和异氰酸酯的序列选择共聚的聚氨酯和聚铝酸酯

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摘要

Aryl isocyanates are introduced as comonomers for ring-opening copolymerization (ROCOP) with epoxides. Informed by studies of reaction kinetics, we show that divergent sequence selectivity for AB- and ABB-type copolymers can be achieved with a single dimagnesium catalyst. The resulting materials respectively constitute a new class of polyurethanes (PUs) and a new class of materials featuring an unprecedented backbone structure, the polyallophanates (PAs). The successful use of isocyanate comonomers in this way marks a new direction for the field of ROCOP while providing distinct opportunities for expansion of PU structural diversity. Specifically, the methodology reported herein delivers PUs featuring fully substituted (tertiary) carbamyl nitrogen atoms, a structural motif that is almost inaccessible via extant polymerization strategies. Thus, in one step from commercially available comonomers, our methodology expands the scope of ROCOP and gives access to diverse materials featuring both privileged (PU) and unexplored (PA) microstructures.
机译:引入异氰酸芳基酯作为共聚单体,用于与环氧化物的开环共聚(ROCOP)。通过对反应动力学的研究得知,我们显示,使用单一的二镁催化剂可以实现AB型和ABB型共聚物的不同序列选择性。所得材料分别构成一类新的聚氨酯(PU)和一类具有前所未有的主链结构的新材料聚铝酸酯(PA)。以这种方式成功使用异氰酸酯共聚单体标志着ROCOP领域的新方向,同时为扩展PU结构多样性提供了独特的机会。具体地,本文报道的方法递送特征在于完全取代的(叔)氨基甲酰基氮原子的PU,其是通过现存的聚合策略几乎不可获得的结构基序。因此,从商业上可获得的共聚单体的一步,我们的方法扩展了ROCOP的范围,并提供了具有特权(PU)和未开发(PA)微结构特征的多种材料。

著录项

  • 来源
    《Journal of the American Chemical Society》 |2020年第18期|8136-8141|共6页
  • 作者单位

    GSK Carbon Neutral Laboratories for Sustainable Chemistry and School of Chemistry University of Nottingham Nottingham NG7 2TU U.K.;

    Faculty of Science Engineering and Computing Kingston University London KT1 2EE U.K;

    Joseph Banks Laboratories School of Chemistry University of Lincoln Lincoln LN6 7DL U.K.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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