期刊
POLYMER
卷 53, 期 22, 页码 5010-5015出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.08.057
关键词
Polymerization; Depolymerization; Vinyl monomer
资金
- National Natural Science Foundation of China [20974044, 90923006]
- National Basic Research Program of China [2011CB935801]
A low temperature strategy for the aqueous polymerization of N-isopropylacrylamide (NIPAM) has been developed. The radical polymerization system is featured with the exclusive use of CuCl and tris(2-dimethylaminoethyl)amine (Me6TREN), devoid of any externally added organic atom transfer radical polymerization (ATRP) initiator. The polymerization reaction is tolerant of variation on the N-substitution pattern, as demonstrated by the synthesis of a homopolymer of acrylamide (AM) and a copolymer of NIPAM and N,N-dimethylacrylamide (DMAA). Importantly, an intriguing phenomenon of depolymerization has been observed at 0 degrees C with the addition of either 2,2,6,6-tetramethylpiperidinooxy (TEMPO) or 1,4-benzoquinone (BQ) to the polymerization system. A control experiment carried out with conventional 2,2'-azobisisobutyronitrile (AIBN) radical system indicates that copper is required in the depolymerization process. The depolymerization reaction is therefore proposed to proceed through beta-alkyl elimination from Cu-II coordination center. These observations provide a likely starting point for the establishment of new synthetic paradigms for the precision recycling of vinyl monomers under mild and benign conditions. (C) 2012 Elsevier Ltd. All rights reserved.
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