Metal-Free Access to Precise Synthesis of Poly(propylene oxide) and Its Blocks with High Activity.
Authors of this article are:
Zhang C, Duan H, Hu L, Zhang C, Zhang X.
A summary of the article is shown below:
The fast and living ring-opening polymerization (ROP) of propylene oxide (PO) via metal-free catalysis is reported. Using triethyl borane (TEB) and organic Lewis bases (LBs, e.g.: phosphazene base, amidine and guanidine) as the catalysts, various alkanols can effectively initiate the ROP of PO, yielding tailor-made 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 the kinetic results of fast initiation and growth, unobserved chain-transfer to PO, chain extension reactions and the synthesis of various PPO-based block copolymers with narrow Đs (< 1.1).
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poly(propylene oxide) organocatalysts precise synthesis low dispersity
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