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Immobilization of copper(II)‐poly( N ‐vinylimidazole) complex on magnetic nanoparticles and its catalysis of oxidative polymerization of 2,6‐dimethylphenol in water
Author(s) -
Wang Huan,
Zhang Wenli,
Shentu Baoqing,
Gu Cheng,
Weng Zhixue
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36484
Subject(s) - catalysis , polymerization , copper , polymer chemistry , chemistry , nuclear chemistry , stoichiometry , gravimetric analysis , organic chemistry , polymer
Poly( N ‐vinylimidazole) (PVI) was grafted onto magnetic Fe 3 O 4 nanoparticles through siloxane bonds to produce PVI‐grafted Fe 3 O 4 nanoparticles (shortened as Fe 3 O 4 ‐ g ‐PVI). The amount of imidazolyl groups in Fe 3 O 4 ‐ g ‐PVI was estimated to be 1.16 mmol/g by elemental analysis and thermal gravimetric analysis. The Fe 3 O 4 ‐ g ‐PVI coordinated with Cu(II) to form the immobilized Cu(II)‐PVI complex. The stoichiometric ratio between imidazolyl groups in Fe 3 O 4 ‐ g ‐PVI and Cu(II) was found to be 4 and the complex formation constant ( K ) was calculated to be 5.6 × 10 14 mol −4 L 4 . The immobilized Cu(II)‐PVI complex was employed to catalyze the oxidative polymerization of 2,6‐dimethylphenol (DMP) in water and showed excellent CO/CC selectivity to form PPO. After polymerization, the immobilized Cu(II)‐PVI complex catalyst was collected by an external magnetic field and reused in the next run with additional immobilized catalyst and copper ions. After three runs of oxidative polymerization of DMP, the recovery rate of the immobilized Cu(II)‐PVI catalyst was above 95% and the yield of PPO maintained as high as 79.2% with the addition of supplementary catalysts. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012