Synthesis of poly(ethylene oxide)-based thermoresponsive block copolymers by RAFT radical polymerization and their uses for preparation of gold nanoparticles
- Authors
- Jeon, Hee Jung; Go, Da Hyeon; Choi, Song-Yee; Kim, Kyung Min; Lee, Jae Yeol; Choo, Dong Joon; Yoo, Hyun-Oh; Kim, Jong Man; Kim, Jungahn
- Issue Date
- Mar-2008
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- thermoresponsive block copolymer; RAFT polymerization; ring-opening polymerization; xanthate-type agent; water-soluble gold nanoparticles
- Citation
- COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, v.317, no.1-3, pp.496 - 503
- Indexed
- SCIE
SCOPUS
- Journal Title
- COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
- Volume
- 317
- Number
- 1-3
- Start Page
- 496
- End Page
- 503
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/172130
- DOI
- 10.1016/j.colsurfa.2007.11.033
- ISSN
- 0927-7757
- Abstract
- 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.
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