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A high strength hydrogel with quadruple-shape memory under the ambient condition

Authors
  • Li, Xin1
  • Xu, Shuangfeng1
  • Wang, Yaling1
  • Hu, Zai-Yin1, 2
  • Wang, Ru1
  • 1 Sichuan University, Department of Applied Chemistry, College of Chemical Engineering, No. 1 Loop, Chengdu, Sichuan, 610041, China , Chengdu (China)
  • 2 Sichuan University, School of Chemical Engineering, Chengdu, 610065, China , Chengdu (China)
Type
Published Article
Journal
Colloid & Polymer Science
Publisher
Springer-Verlag
Publication Date
Feb 06, 2019
Volume
297
Issue
4
Pages
503–512
Identifiers
DOI: 10.1007/s00396-019-04475-9
Source
Springer Nature
Keywords
License
Yellow

Abstract

It is worth looking forward to manufacturing a shape memory hydrogel (SMH) with good mechanical properties for practical applications in a simple and rapid manner. In this study, the one-pot method has been proposed to prepare a quadruple shape memory hydrogel (PAA-CS, poly(acrylic acid)-chitosan). The PAA-CS hydrogel obtained by mixing acrylic acid (AA), chitosan (CS), initiator, and cross-linker at 60 °C shows excellent function of shape memory and recovery less than 20 s. Moreover, its maximum deformation can reach to 100%. Scanning electron microscopy (SEM) showed that PAA-CS hydrogels would form new cross-linked networks in NaOH, NaCl, and FeCl3, and these new networks can trigger quadruple shape memory. In addition, the tensile and compressive strength tests showed the PAA-CS hydrogel possesses outstanding mechanical properties. Its excellent property has enormous potential in applications where multi-shape changes responding to different stimuli are required.

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