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Transparency Change Mechanochromism Based on a Robust PDMS‐Hydrogel Bilayer Structure
Author(s) -
Xu Yonghang,
Zeng Songshan,
Xian Weikang,
Lin Limiao,
Ding Hao,
Liu Jingjing,
Xiao Min,
Wang Shuanjin,
Li Ying,
Meng Yuezhong,
Sun Luyi
Publication year - 2021
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000446
Subject(s) - materials science , bilayer , self healing hydrogels , polydimethylsiloxane , covalent bond , polymer , polymer chemistry , copolymer , chemical engineering , monomer , nanotechnology , composite material , chemistry , organic chemistry , membrane , biochemistry , engineering
Hydrogels and polydimethylsiloxane (PDMS) are complementary to each other, since the hydrophobic PDMS provides a more stable and rigid substrate, while the water‐rich hydrogel possesses remarkable hydrophilicity, biocompatibility, and similarity to biological tissues. Herein a transparent and stretchable covalently bonded PDMS‐hydrogel bilayer (PHB) structure is prepared via in situ free radical copolymerization of acrylamide and allylamine‐exfoliated‐ZrP (AA‐e‐ZrP) on a functionalized PDMS surface. The AA‐e‐ZrP serves as cross‐linking nano‐patches in the polymer gel network. The covalently bonded structure is constructed through the addition reaction of vinyl groups of PDMS surface and monomers, obtaining a strong interfacial adhesion between the PDMS and the hydrogel. A mechanical‐responsive wrinkle surface, which exhibs transparency change mechanochromism, is created via introducing a cross‐linked polyvinyl alcohol film atop the PHB structure. A finite element model is implemented to simulate the wrinkle formation process. The implication of the present finding for the interfacial design of the PHB and PDMS‐hydrogel‐PVA trilayer (PHPT) structures is discussed.