Synthesis and characterization of multi-sensitive microgel-based polyampholyte hydrogels with high mechanical strength

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• 作者：Haiwei Wang ; Pengchong Li ; Kun Xu ; Ying Tan ; Cuige Lu…
• 关键词：Microgel ; based ; Polyampholyte hydrogels ; High mechanical strength ; Multi ; sensitive
• 刊名：Colloid & Polymer Science
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：294
• 期：2
• 页码：367-380
• 全文大小：4,405 KB
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• 作者单位：Haiwei Wang (1) (2)
  Pengchong Li (1) (2)
  Kun Xu (1)
  Ying Tan (1)
  Cuige Lu (1)
  Yangling Li (1) (2)
  Xuechen Liang (1) (2)
  Pixin Wang (1)
  
  1. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, People’s Republic of China
  2. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

In this study, multi-sensitive hydrogels with high mechanical strength were successfully prepared by in situ free-radical polymerization of acrylamide, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride monomers in the presence of microgels in aqueous media. Microgels with amine groups on the surface were used as polyfunctional initiating and cross-linking centers to fabricate a network. The microgel-based hydrogels synthesized did not fracture upon loading up to 30 MPa and a strain above 99 % when the water content was about 84 wt%. As for the swelling behaviors of the microgel-based hydrogels, they were susceptible to pH and salt concentration. Meanwhile, deswelling tests indicated that the microgel-based hydrogels had thermo-sensitive properties and under high temperature exhibited a faster shrinking rate, which could be attributed to the solvent channels caused by the shrinkage of microgels due to their thermo-sensitive core. And microgel-based hydrogels with various deswelling rates can be determined by regulating the content and species of microgel. Furthermore, the low extensibility of microgel-based polyampholyte hydrogels could be improved by creating a hybrid network with microgels and a small amount of N,N’-methylenebisacrylamide served as the chemical cross-linkers. The hybrid hydrogels possessed superior compressive strength and simultaneously showed abnormal elongation of up to 1000 %. Keywords Microgel-based Polyampholyte hydrogels High mechanical strength Multi-sensitive