4.7 Article

Preparation of star polymers based on polystyrene or polystyrene-b-N-isopropyl acrylamide) and divinylbenzene via reversible addition-fragmentation chain transfer polymerization

Journal

POLYMER
Volume 46, Issue 8, Pages 2802-2810

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2005.01.071

Keywords

star-shaped polymers; RAFT polymerization; cross-linked polymerization

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Star polymers based on styrene/divinyl benzene (St/DVB) and PSt-b-poly(N-isopropyl acrylamide) (NIPAAM)/DVB have been successively prepared by 'arm-first' method via reversible addition-fragmentation chain transfer (RAFT) polymerization. The linear macro RAFT agent PSt-SC(S)Ph was prepared by RAFT polymerization of St using benzyl dithiobenzoate and AIBN as RAFT agent and initiator. Successive RAFT polymerization of NIPAAM with PSt-SC(S)Ph as macro RAFT agent to afford diblock copolymer, PSt-b-PNIPAAM-SC(S)Ph. The coupling reactions of PSt-SC(S)Ph or PSt-b-PNIPAAM-SC(S)Ph in the presence of DVB produced the star copolymers, C(PSt)(n) or C(PSt-b-PNIPAAM)(n). The molar ratio of DVB/PSt-SC(S)Ph and polymerization time influenced the yields, molecular weight and distribution of the star-shaped polymers, which was characterized by H-1 NMR and IR spectra, GPC measurements as well as DLS. (c) 2005 Elsevier Ltd. All rights reserved.

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