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Metal-Free Route to Precise Synthesis of Poly(propylene oxide) and Its Blocks with High Activity  
Metal-Free Route to Precise Synthesis of Poly(propylene oxide) and Its Blocks with High Activity
資料類型: PDF文件
關鍵詞: Metal-Free  propylene  oxide  High  Activity  
資料大?。?/td> 1160k
所屬學科: 高分子化學
來源: 來源網絡
簡介:
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 (W<1.1).
上傳人: xhzhang
上傳時間: 2019-04-01 16:57:10
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