N-[2-(8-heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethyl]-2-bromoisobutyramide as initiator for atom transfer radical polymerization (ATRP) and surface-initiated ATRP of methyl methacrylate on iron |
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Authors: | Gang Lu Yi-Min Li Chun-Hua Lu Zhong-Zi Xu Hua Zhang |
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Affiliation: | (1) School of Material Science and Engineering, Nanjing University of Technology, 210009 Nanjing, People’s Republic of China |
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Abstract: | N-2-(8-heptadecenyl)-4,5-dihydro-1H-imidazole-1-ethyl]-2-bromoisobutyramide (IEB) was synthesized and characterized by elemental
analysis, FT-IR, and 1H NMR. It had been successfully used as a bidentate initiator for the ATRP of methyl methacrylate with CuBr/2,2′-bipyridine
as the catalyst, and N,N-dimethylformamide as the solvent at 70 °C. The kinetics was first order in monomer and the number-average molecular weight
of the polymer increased linearly with the monomer conversion, indicating the ‘living’/controlled nature of the polymerization.
The polymerization reached high conversions producing polymers with a low molecular weight distribution (
M
w/M
n = 1.319). The obtained poly(methylmethacrylate) (PMMA) functionalized with 2-(8-heptadecenyl)-4,5-dihydro-1H-imidazoleyl
and ω-Br as the end groups were characterized by FT-IR spectroscopy. They can be used as macroinitiators for chain extension
reaction. Then, PMMA coatings were grafted from iron substrates by surface-initiated ATRP from a surface-bound IEB initiator.
The EIS measurements confirmed the successful grafting of the polymer coatings. Greatly improved short-term anticorrosive
properties for PMMA-modified electrodes were demonstrated by substantially increased resistance of the film for a period of
24 h as compared to bare iron. |
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Keywords: | |
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