Abstract
Initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) of acrylonitrile was first conducted at various ambient temperatures (30–45 °C). The key to success is ascribed to the usage of an appropriate low temperature radical initiator (2,2′-azobis(2,4-dimethylvaleronitrile)) and a high reactivity catalytic system (CuBr2/Me6TREN). The molar ratio of Cu catalyst to AN as low as 1:20000 was used to prepare well-defined polyacrylonitrile with controlled molecular weight and a narrow polydispersity index range of 1.08–1.30, while the monomer conversion was up to ca. 98%. The apparent activation energy of the polymerization was calculated to be 128.45 kJ/mol, suggesting that the polymerization strongly depended on reaction temperature. The very high chain-end functionality of the resultant polymer was confirmed by 1H-NMR and GPC analyses as well as chain extension reaction.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 21074127 and 20804044) and the Key Project of Chinese Ministry of Education (No. 212003).
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Zhang, Fj., Liu, Xh. ICAR ATRP of acrylonitrile utilizing a moderate temperature radical initiator. Chin J Polym Sci 31, 1613–1622 (2013). https://doi.org/10.1007/s10118-013-1348-y
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DOI: https://doi.org/10.1007/s10118-013-1348-y