Rigid and Strong Thermoresponsive Shape Memory Hydrogels Transformed from Poly(vinylpyrrolidone- co-acryloxy acetophenone) Organogels

ACS Applied Materials & Interfaces
Chen JiaoHuiliang Wang

Abstract

Shape memory hydrogels (SMHs) have a wide range of potential practical applications. However, the mechanically weak and soft nature of most SMHs strongly impedes their applications. Here, we report a novel kind of thermal-responsive SMH with high tensile strength and high elastic moduli. Organogels are first prepared by the copolymerization of a hydrophilic monomer N-vinylpyrrolidone (NVP) and a hydrophobic monomer acryloxy acetophenone (AAP) in N, N'-dimethylformamide (DMF) solutions, and then, poly(vinylpyrrolidone- co-acryloxy acetophenone) [poly(NVP- co-AAP)] hydrogels are obtained by solvent exchange with water. Because of the strong and reversible hydrophobic association and π-π stacking of acetophenone groups, the poly(NVP- co-AAP) hydrogels exhibit tensile strengths up to 8.41 ± 0.83 MPa and Young's moduli up to 94.2 ± 1.3 MPa, which are more than 1 or 3 orders of magnitude higher than those of the organogels, respectively. The poly(NVP- co-AAP) hydrogels exhibit good shape memory behaviors, with a complete fixation ratio and a recovery ratio of 74-89%, as well as very fast shape-fixing and recovering rates (in seconds). These rigid and strong hydrogels are demonstrated to be an ideal shape memory material for surgical ...Continue Reading

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Citations

Dec 1, 2019·Nature Communications·Luai R Khoury, Ionel Popa
Jun 5, 2020·Science Advances·Luai R KhouryIonel Popa
Jul 12, 2019·Macromolecular Rapid Communications·Shurui YangZhen Tong
Dec 28, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Tianqi LiuHuiliang Wang
Oct 24, 2020·Chemical Communications : Chem Comm·Xiaohu ZhouXuechang Zhou
Apr 21, 2021·Chemical Communications : Chem Comm·Chuang DongDaisaku Kaneko
Oct 28, 2019·ACS Applied Materials & Interfaces·Ruixue LiangKaleem-Ur-Rahman Naveed
Oct 31, 2019·ACS Applied Materials & Interfaces·Chen Fei DaiQiang Zheng
Sep 23, 2020·ACS Applied Materials & Interfaces·Shurui YangZhen Tong
Jun 18, 2019·ACS Macro Letters·A Kristen Means, Melissa A Grunlan

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