Quasi-Living Copolymerization of Aryl Isocyanates and Epoxides,ACS Macro Letters

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Quasi-Living Copolymerization of Aryl Isocyanates and Epoxides
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-10-19 , DOI: 10.1021/acsmacrolett.0c00696
Lidao Song ₁ , Wei Wei ₁ , Muhammad Amjad Farooq ₁ , Huiming Xiong _{1,

2,

3}

Affiliation

Nontraditional polyurethane (PU) has been successfully synthesized by anionic copolymerization of some typical aryl isocyanates and epoxides with ammonium halide onium salt (Lewis base) as the initiator and triisobutylaluminum (Lewis acid) as the activator and the synergistic coordinator. In contrast to the traditional step-growth approach, this chain-growth copolymerization can maintain the anionic propagation site and exhibit some living features with a high activity, by which the copolymers synthesized have narrow molecular weight distributions and discrete end groups. The copolymer is primarily constituted by a urethane linkage, and the byproducts of isocyanurate trimer and oxazolidinone can be effectively suppressed as the polymerization proceeds. Density functional theory (DFT) calculations were also performed to support the proposed reaction mechanism.

中文翻译：

芳基异氰酸酯与环氧化物的准活性共聚

以卤化铵鎓盐（路易斯碱）为引发剂，三异丁基铝（路易斯酸）为活化剂和协同配位剂，通过阴离子共聚一些典型的芳基异氰酸酯和环氧化物，成功合成了非传统聚氨酯（PU）。与传统的逐步增长方法相比，这种链增长共聚可以保持阴离子增长位点并表现出一些具有高活性的活性特征，由此合成的共聚物具有窄的分子量分布和离散的端基。该共聚物主要由氨基甲酸酯键构成，随着聚合的进行，可以有效抑制异氰脲酸酯三聚体和恶唑烷酮的副产物。

更新日期：2020-11-17

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