Metal‐Free Route to Precise Synthesis of Poly(propylene oxide) and Its Blocks with High Activity,ChemSusChem

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Metal‐Free Route to Precise Synthesis of Poly(propylene oxide) and Its Blocks with High Activity
ChemSusChem ( IF 7.5 ) Pub Date : 2018-11-19 , DOI: 10.1002/cssc.201802258
Cheng‐Jian Zhang ₁ , Han‐Yi Duan ₁ , Lan‐Fang Hu ₁ , Cheng‐Hui Zhang ₁ , Xing‐Hong Zhang ₁

Affiliation

The fast and living ring‐opening polymerization (ROP) of propylene oxide (PO) by metal‐free catalysis is reported. By using triethyl borane (TEB) and organic Lewis bases (LBs, e.g.: phosphazene base, amidine and guanidine) as the catalysts, various alkyl alcohols can effectively initiate the ROP of PO, yielding tailor‐made poly(propylene oxide)s (PPOs) with high regioregularity, predictable molecular weights, and narrow dispersity approaching Poisson distribution. The TEB/LB catalysts present unprecedentedly high activity (turnover frequency of up to 7500 h⁻¹) and a truly living character for the polymerization, as evidenced by kinetic studies that showed fast initiation and growth, unobserved chain‐transfer to PO, chain extension reactions, and the synthesis of various PPO‐based block copolymers with narrow dispersities (Đ<1.1).

中文翻译：

精确合成高活性聚环氧丙烷及其嵌段的无金属途径

据报道，通过无金属催化的环氧丙烷（PO）快速且活泼的开环聚合（ROP）。通过使用三乙基硼烷（TEB）和有机路易斯碱（LB，例如：磷腈碱，am和胍）作为催化剂，各种烷基醇可以有效地引发PO的ROP，从而产生量身定制的聚环氧丙烷（PPO）），具有较高的区域规则性，可预测的分子量和接近Poisson分布的窄分散性。TEB / LB催化剂具有前所未有的高活性（周转频率高达7500 h ^-1）和聚合反应的真实活性，动力学研究表明其快速引发和生长，未观察到的向PO的链转移，扩链反应以及各种具有窄分散性的PPO基嵌段共聚物的合成（Đ <1.1 ）。

更新日期：2018-11-19

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