Citation: Li-bin Bai, Kun Zhao, Yong-gang Wu, Wen-liang Li, Su-juan Wang, Hai-jun Wang, Xin-wu Ba, Hong-chi Zhao. A New Method for Synthesizing Hyperbranched Polymers with Reductive Groups Using Redox/RAFT/SCVP[J]. Chinese Journal of Polymer Science, ;2014, 32(4): 385-394. doi: 10.1007/s10118-014-1418-9 shu

A New Method for Synthesizing Hyperbranched Polymers with Reductive Groups Using Redox/RAFT/SCVP

Received Date: 22 July 2013
Revised Date: 4 December 2013

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 20904008 and 21274037) and College of Science and Technology Foundation of Hebei Education Department (2010015, B2010000214).

The novel hyperbranced polymers containing reductive groups were successfully prepared and characterized using redox/reversible addition fragmentation chain transfer (RAFT)/self-condensing vinyl polymerization (SCVP) method. Several redox initiating chemicals such as Cu(Ⅲ)/―CONH2, Ce(Ⅳ)/―CONH2 and Ce(Ⅳ)/―OH were chosen to increase the free radical generating rate, and the chain transfer agent (CTA) was used to reduce the molecular chain propagating rate, in order to obtain polymers with high degree of branching. Detailed analyses based on the molecular weight, value and the degree of branching of polymers (DB) obtained from 1H-NMR spectra and multi detector size exclusion chromatography (MDSEC) suggested the acquiring of hyperbranced polyacrylamides with Cu(Ⅲ)/―CONH2 and Ce(Ⅳ)/―CONH2 as initiator in the presence of the CTA. Meanwhile, the as-prepared poly(N-hydroxymethyl acrylamide) (PNHAM) with higher DB value (0.48) proved that using Ce(Ⅳ)/―OH as the initiator could increase the free radical generating rate and diminish the gap between the propagating rate and the initiation rate during the reaction procedure. In addition, the effect of oxidant concentration on the Mark-Houwink index () value and the DB was also studied.
- Hyperbranched polymers,
- Redox,
- RAFT,
- SCVP,
- Free radical polymerization
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