Citation: Ping Li, Yi Liu, Ziang Wang, Xuemei Xiao, Guozhe Meng, Xiaolin Wang, Hong-Lei Guo, Hui Guo. Dry-regulated hydrogels with anisotropic mechanical performance and ionic conductivity[J]. Chinese Chemical Letters, ;2022, 33(2): 871-876. doi: 10.1016/j.cclet.2021.08.010 shu

Dry-regulated hydrogels with anisotropic mechanical performance and ionic conductivity

Ping Li ^a ,
Yi Liu ^a ,
Ziang Wang ^a ,
Xuemei Xiao ^a ,
Guozhe Meng ^a ,
Xiaolin Wang ^{b, *,} ,
Hong-Lei Guo ^a, ,
Hui Guo ^{a, *,}

a.
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
b.
School of Pharmacy and State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macao, China

xilwang@must.edu.mo

guohonglei@mail.sysu.edu.cn

guoh37@mail.sysu.edu.cn

Received Date: 14 May 2021
Revised Date: 4 August 2021
Accepted Date: 5 August 2021
Available Online: 10 August 2021

Figures(6)

Nature consists of various soft tissues with well-ordered hierarchical anisotropic structures, which play essential roles in biological systems to exhibit particular functions. Mimicking bio-tissues, synthetic hydrogels with anisotropic structures have received considerable attention in recent years. However, existing approaches to fabricate anisotropic hydrogels often require complicated procedures, which are time-consuming and labor-demanding. Inspired by the dry-induced crystallization phenomenon, we report a simple yet effective prestretching-drying-swelling method to afford anisotropic crystalline polyvinyl alcohol hydrogels. Owing to the distinct anisotropic microstructure, the hydrogels demonstrate excellent mechanical properties with noticeable directional distinction. It is revealed that both the enhancing of pre-orientation strain and the extending of heating time make the hydrogels with better mechanical properties and more remarkable anisotropicity. Owing to the anisotropically aligned structure, the hydrogels exhibit remarkably differential ionic conductivity: the difference between the parallel and vertical conductivity of the same sample can reach as high as 6.6 times, making the materials possible candidates as nano-conductive materials. We anticipate that this simple yet effective approach may become highly useful for fabricating oriented hydrogels and endow the materials with more promising application prospects in the future.
- Crystalline hydrogels,
- Anisotropicity,
- Dry process,
- Mechanical performance,
- Differential conductivity
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