Preparation of thermosensitive PNIPAm-Grafted mesoporous silica particles
- Authors
- Park, Jun Hwan; Lee, Young Ho; Oh, Seong Geun
- Issue Date
- Nov-2007
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- emulsion-gel method; PNIPAm; radical polymerization; silicas; thermoresponsive
- Citation
- MACROMOLECULAR CHEMISTRY AND PHYSICS, v.208, no.22, pp.2419 - 2427
- Indexed
- SCIE
SCOPUS
- Journal Title
- MACROMOLECULAR CHEMISTRY AND PHYSICS
- Volume
- 208
- Number
- 22
- Start Page
- 2419
- End Page
- 2427
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/179413
- DOI
- 10.1002/macp.200700247
- ISSN
- 1022-1352
- Abstract
- In this study, the composites of thermoresponsive poly(N-isopropylacrylamide) (PNIPAm) and mesoporous silica particles were synthesized. 3-(Trimethoxysilyl)propyl methacrylate (MOP) was used to introduce double bonds on silica particles. First, MOP-modified spherical silica particles were prepared by the sequential addition of tetraethyl orthosilicate (TEOS) and MOP into W/O (water-in-oil) emulsion. Second, PNIPAm-grafted silica microparticles were synthesized by the radical copolymerization of MOP-modified silica particles and N-isopropylacrylamide (NIPAm) monomers in the ethanol/water mixture. Polymerization was carried out with the variation of reaction temperature, concentration of crosslinking agent, and weight ratio of MOP-modified silica particles to NIPArn monomers. The formations of MOP-functionalized silica microspheres and PNIPAm-grafted silica microparticles were characterized by FE-SEM, TEM, FTIR, TGA, and BET. The lower critical solution temperature (LCST) of the PNIPAm-grafted silica particles was investigated by DSC.
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