Critical behavior and volume phase transition of hydrogels in a micro-space
| Project/Area Number |
25620171
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Polymer/Textile materials
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| Research Institution | Shinshu University |
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Principal Investigator |
SATO Takaaki 信州大学, 学術研究院繊維学系, 准教授 (20373029)
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| Co-Investigator(Renkei-kenkyūsha) |
SUZUKI Daisuke 信州大学, 学術研究院繊維学系, 准教授 (90547019)
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| Research Collaborator |
YANASE Keiichi 信州大学, 理工学系研究科
AMANO Kenshi 信州大学, 理工学系研究科
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 温度応答高分子 / ゲル微粒子 / 小角広角X線散乱法 / 相関長 / 臨界現象 / フラクタル / 誘電分光 / 疎水性相互作用 / 感温性高分子 / 小角広角X線散乱 / ポリイソプロピルアクリルアミド / 臨界挙動 / 誘電分散 |
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| Outline of Final Research Achievements |
This study aimed at establishing a renovated technique for observation and quantitative evaluation of critical phenomena and volume phase transition that thermos-responsive hydrogels exhibit in an extreme micro-space. We targeted better understanding of their critical behavior, involving universality, its breakage, and the underlying molecular mechanisms. We used small- and wide-angle X-ray scattering, dynamic light scattering, and dielectric relaxation spectroscopy. First, we focused on a coil-to-globule transition of poly N-isopropylacrylamide (pNIPAm) in aqueous media, and gained deeper insights into microscopic correlation between the main chains, solvent deuterium isotope effects, and dehydration behavior. Then, we synthesized a series of microgel particles by crosslinking the thermo-responsive polymers. Using the static and dynamic scattering techniques, we succeeded in grasping the gist of their critical behavior, which was quantitatively different from those of bulk gels.
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Report
(3 results)
Research Products
(10 results)
