Novel polymer gels based on phase structure of aqueous dispersion of polymer microgels

基于聚合物微凝胶水分散体相结构的新型聚合物凝胶

• 批准号: 21550204
• 负责人: TAKESHITA Hiroki
• 金额: $ 3.16万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21550204/
• 关键词: ガラス化; コロイド結晶化; ポリ(N-イソプロピルアクリルアミド)ゲル; 光散乱; 高分子マイクロゲル

Phase transition of aqueous dispersions of monodisperse poly(N-isopropylacrylamide) microgels was investigated. From the phase diagram drawn on the basis of the diffracted light from the dispersions, it was found that the critical crystallization volume fraction was independent of temperature, which indicates that phase transition in this colloidal system was dominated by repulsive inter-particle interaction. The relaxation dynamics of the concentrated dispersions was investigated by a dynamic light scattering technique. In liquid phase above the melting temperature, usual translational diffusion of the particles was observed. In contrast, the diffusion coefficient in crystalline and glassy states increased with decreasing temperature despite the increasing size of the microgels. Gels synthesized by the subsequent polymerization in the presence of the microgels had a good extension strength compared to the conventional ones without the microgels.

研究了单分散聚（N-异丙丙烯酰胺）微凝胶的水分散体的相变。从分散体的衍射光基础上绘制的相图，发现临界结晶体积分数与温度无关，这表明该胶体系统中的相位转变以排斥性颗粒间相互作用为主。通过动态光散射技术研究了浓缩分散体的松弛动力学。在高于熔化温度的液相中，观察到颗粒的通常翻译扩散。相反，尽管微凝胶尺寸增加，但晶体和玻璃状态的扩散系数随温度降低而增加。与没有微凝胶的常规凝胶相比，在微凝胶存在下通过随后的聚合合成的凝胶具有良好的延伸强度。

项目成果

ポリNIPAマイクロゲルの相挙動

PolyNIPA 微凝胶的相行为

• 发表时间: 2009
• 作者: 寥榕強;石橋三希;武藤高明;松川真吾;竹下宏樹
• 通讯作者: 竹下宏樹

Colloidal crystallization of poly (N-isopropylacrylamide) microgels

聚（N-异丙基丙烯酰胺）微凝胶的胶体结晶

• 发表时间: 2011
• 作者: Hiroki Takeshita;Shouta Nakano;Masamitsu Miya;Katsuhiko Takenaka;Tomoo Shiomi
• 通讯作者: Tomoo Shiomi

ポリNIPAマイクロゲルのコロイド結晶化挙動

聚NIPA微凝胶的胶体结晶行为

• 发表时间: 2010
• 作者: 中野将太;竹下宏樹;宮正光;竹中克彦;塩見友雄
• 通讯作者: 塩見友雄

Fast shrinking kinetics of poly(N-isopropylacrylamide) hydrogels containing a nonionic surfactant

• DOI: 10.1007/s00396-009-2069-1
• 发表时间: 2009-06
• 期刊: Colloid and Polymer Science
• 影响因子: 2.4
• 作者: Hiroki Takeshita;Midori Sano;Kotaro Wada;Keita Tamura;M. Miya;K. Takenaka;T. Shiomi

Colloidal crystallization of poly(N-isopropylacrylamide) microgels

聚(N-异丙基丙烯酰胺)微凝胶的胶体结晶

• 发表时间: 2011
• 作者: Hiroki Takeshita;Shouta Nakano;Masamitsu Miya;Katsuhiko Takenaka and Tomoo Shiomi
• 通讯作者: Katsuhiko Takenaka and Tomoo Shiomi