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Preparation and Characterization of Micrometer-sized Poly(N-isopropylacrylamide) Hydrogel Particles: Effect of Initiator Concentration
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- SHIMIZU Hidenobu
- Department of Applied Bioscience, Faculty of Applied Bioscience, Kanagawa Institute of Technology
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- WADA Risei
- Department of Applied Bioscience, Faculty of Applied Bioscience, Kanagawa Institute of Technology
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- OKABE Masaru
- Department of Applied Bioscience, Faculty of Applied Bioscience, Kanagawa Institute of Technology
Bibliographic Information
- Other Title
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- ミクロンサイズのポリ（Ｎ－イソプロピルアクリルアミド）ヒドロゲル粒子の作製：開始剤の濃度と種類の影響
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Description
Aqueous precipitation polymerization of N-isopropylacrylamide (NIPAM) with N,N′-methylenebisacrylamide in water at 70°C provides thermosensitive hydrogel particles. In the present study, the effect of initiator concentration on the particle size was investigated. 2,2′-Azobis(2-amidinopropane)dihydrochloride (V-50) and 2,2′-azobis[2-methyl-N-(2-hydroxyethyl)propionamide] (VA-086) were used as a cationic and a nonionic initiator, respectively. Samples were investigated by electron microscopy, and we found that the particle size increased with increasing initiator concentration irrespective of initiator type. PNIPAM particles with a diameter above 1 μm were synthesized. Dynamic light scattering data showed that micrometer-sized PNIPAM particles swelled to about 50-fold volume after decreasing the temperature below the phase transition temperature. On the other hand, the volume of smaller, submicrometer-sized PNIPAM particles increased only to about 8-fold volume. These results indicate that PNIPAM hydrogel particles with a diameter above 1 μm and high swelling capacity can be obtained by precipitation polymerization of NIPAM at higher initiator concentrations.<br>
Journal
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- KOBUNSHI RONBUNSHU
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KOBUNSHI RONBUNSHU 65 (12), 751-755, 2008
The Society of Polymer Science, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282681503433344
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- NII Article ID
- 130004489141
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- ISSN
- 18815685
- 03862186
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed