期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 317, 期 1-3, 页码 496-503出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2007.11.033
关键词
thermoresponsive block copolymer; RAFT polymerization; ring-opening polymerization; xanthate-type agent; water-soluble gold nanoparticles
The amphiphilic block copolymers were synthesized by reversible addition fragmentation chain transfer (RAFT) radical polymerization of N-isopropylacrylamide (NiPAM) using poly(ethylene oxide) (PEO)-based xanthate-type of RAFT agent and 2,2'-azobisisobutyronitrile (AIBN) in aqueous media at 85 degrees C for 12 h. The PEO-based RAFT agent could be easily synthesized by the reaction of terminally brominated PEO with o-ethylxantic acid potassium salt. The yield was over 95 mol% on the basis of incipient amount of polymeric alkoxide obtained from a ring opening polymerization of ethylene oxide. The different molecular weights of the poly(N-isopropylacrylamide) (PNiPAM) fragments of poly(ethylene oxide-b-N-isopropylacrylamide) played an important role to exhibit different thermoresponsive behaviors. The resulting block copolymers were successfully used as polymeric stabilizers to prepare water-soluble nano-sized gold particles. All the materials were characterized by the combination of H-1 NMR, SEC, TEM, and XRD analyses. (C) 2007 Elsevier B.V. All rights reserved.
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