4.8 Article

A recyclable metal-free catalytic system for the cationic ring-opening polymerization of glycidol under ambient conditions

期刊

GREEN CHEMISTRY
卷 24, 期 1, 页码 251-258

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1gc03063a

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资金

  1. Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program [20011123]
  2. National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1C1C1005569]
  3. Korea Research Institute of Chemical Technology (KRICT) [KS2041-00]
  4. NRF [NRF-2021R1A2C3004978]
  5. Korea Evaluation Institute of Industrial Technology (KEIT) [20011123] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  6. National Research Foundation of Korea [2020R1C1C1005569] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study successfully conducted metal-free cationic ring-opening polymerization using tris(pentafluorophenyl)borane (BCF) as a catalyst, resulting in well-controlled branched cyclic polyglycidol (BC-PGD) structure. By operating in nonpolar solvents and achieving a recycling polymerization process under ambient conditions with unpurified reagents, a phase separation of PGD with uniform molecular weight distribution was achieved.
A recyclable catalytic system for ionic polymerization under ambient conditions is still undoubtedly a challenging issue that needs to be addressed for industrial production. In this study, a metal-free cationic ring-opening polymerization of glycidol (GD) using tris(pentafluorophenyl)borane (B(C6F5)(3), BCF) as a catalyst affords a well-controlled branched cyclic polyglycidol (BC-PGD) structure and a recycling polymerization process was achieved using unpurified reagents and ambient conditions. Although homogeneous catalysts cannot usually be readily recycled during polymerization, the growing PGD chains in nonpolar solvents induces self-precipitation in catalyst solutions with increasing molecular weight and hydrophilicity, causing a phase separation of PGD with a uniform molecular weight distribution. Specifically, the recycling polymerization process is successfully performed by repeating the simple sequence of decantation and addition of the unpurified monomer. The unique structure of the obtained PGDs was confirmed by H-1 NMR, inverse-gated C-13 NMR analyses, SEC, and MALDI-ToF-MS. Based on the green and recyclable BCF-catalyzed cationic ring-opening polymerization, more intriguing examples with simple and well-reproducible polymerization techniques are anticipated for challenging industrial applications.

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