Facile, simple, and inexpensive ionic liquid, 1-phenyl-3-methylimidazole diphenyl phosphate, as an efficient phosphorus-based ligand for copper-catalyzed reverse atom transfer radical polymerization of methyl methacrylate

作者：Liu, Xiao-hui^*; Zhu, Qian; Zhang, Yan-guang; Zhang, Qiu-yan; Ding, Chen; Li, Jun

来源：RSC Advances, 2017, 7(71): 45022-45028.

DOI：10.1039/c7ra09154k

• ACTIVATOR REGENERATION
• ATRP PROCESS
• AGET ATRP
• CU-II
• ACRYLONITRILE

Ligands play a vital role in atom transfer radical polymerization (ATRP) in solubilizing the transition-metal salt and adjusting the redox potential of the metal center. In general, nitrogen ligands work particularly well for copper-mediated ATRP, while phosphorus-based ligands are rarely used due to less effectiveness. Therefore, this work aims to explore for the first time a facile, simple, and inexpensive ionic liquid (IL), 1-phenyl-3-methylimidazole diphenyl phosphate ([Phmim][Ph2PO4]), as an efficient phosphorus ligand for CuBr2-mediated reverse ATRP. The key to success is ascribed to stronger complexation of the IL ligand with the catalyst and higher solubility of the resulting complex. The polymerizations proceeded in a controlled/"living" fashion, as evidenced by first-order kinetics, linear evolution of molecular weights with monomer conversion, and narrow molecular weight distributions. Effects of various experimental parameters-solvent, reaction temperature, IL, and molar ratio of CuBr2/[Phmim][Ph2PO4]-on the polymerization were investigated in detail. Furthermore, H-1 NMR analysis confirmed the halogencontaining chain-end functionality of the resultant polymer.

• 出版日期2017
• 单位天津工业大学