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Smart Hydrogel Actuators Assembled
增强出版via Dynamic Boronic Ester Bonds- Acta Polymerica Sinica Vol. 50, Issue 5, Pages: 496-504(2019)
- 作者机构：
1.中国科学院宁波材料科学与技术研究所 宁波 315201
2.上海大学材料科学与工程学院 上海 200444
- 作者简介：
- 基金信息：
DOI：10.11777/j.issn1000-3304.2019.18281
CLC：Published：2019-5，
Published Online：25 February 2019，
Received：29 December 2018，
Revised：18 January 2019，
扫 描 看 全 文
Bao-yi Wu, Ya-wen Xu, Xiao-xia Le, Yu-kun Jian, Wei Lu, Jia-wei Zhang, Tao Chen. Smart Hydrogel Actuators Assembled
via Dynamic Boronic Ester Bonds. [J]. Acta Polymerica Sinica 50(5):496-504(2019)Bao-yi Wu, Ya-wen Xu, Xiao-xia Le, Yu-kun Jian, Wei Lu, Jia-wei Zhang, Tao Chen. Smart Hydrogel Actuators Assembled
via Dynamic Boronic Ester Bonds. [J]. Acta Polymerica Sinica 50(5):496-504(2019) DOI： 10.11777/j.issn1000-3304.2019.18281.
摘要
将苯硼酸基团引入水凝胶网络中，以聚乙烯醇(PVA)为胶水，在碱性条件下通过水凝胶表面与PVA形成动态硼酸酯键，实现了含有苯硼酸基团的水凝胶的模块化组装. 通过显微红外表征，证明了在2块水凝胶界面形成了硼酸酯键，并且组装后的水凝胶黏合强度大于水凝胶本体. 随后引入聚阳离子单体甲基丙烯酰氧乙基三甲基氯化铵(METAC)以及
N
-异丙基丙烯酰胺(NIPAm)实现了双层水凝胶的离子与温度双重刺激响应，并且通过胶水黏合位置的选择，实现了二维与三维复杂形变. 最后通过刺激响应的双重正向叠加制备了抓取力可调的软机械夹具.
Abstract
The reversible mechanical deformations of smart hydrogel actuators
such as swelling/shrinking and bending
under various external stimuli have earned them mounting attention in the application arenas of biomimetic actuators
soft robots
etc
. Hydrogel actuators were initailly designed with isotropic structures for a simple swelling/shrinking triggered by external stimuli
while the research progress afterwards focuses more on the design of anisotropic structures that aims at complex shape deformation. However
the determined structure of traditional anisotropic hydrogel actuators typically led to fixed shape deformation direction and degree
which limited them from meeting the actual needs. To this end
we got inspired by the assembly of building blocks and integrated boronic acid groups into the hydrogel bulks. Poly(vinyl alcohol) (PVA) promoted the binding process of newly introduced groups by forming PBA-diol ester bonds with them under alkaline conditions
which was further confirmed by microscopic infrared spectroscopy. The dynamic covalent bonds between two hydrogel sheets were so strong that they were adhered firmly with each other without breaking during the tensile test. Then
two kinds of cationic monomers
methacryloxyethyltrimethyl ammonium chloride (METAC) and
N
-isopropyl acrylamide (NIPAM)
were introduced into the hydrogel system
respectively
to afford two types of stimuli-responsive hydrogels
and the smart hydrogel actuators that dually responded to temeperature and ionic strength were successfully fabricated by the sheet combination
via
PBA-diol ester bonds. Both 2D and 3D architectures could be achieved at elaborate selection of bonding positions. For instance
bonding of a 2D octopus-shaped hydrogel to another planar hydrogel could transfrom the 2D structure into a 3D type along with the swelling of octopus-shaped hydrogel. Finally
integration of METAC and NIPAM into one system could afford a soft gripper with tunable grasping force and dual responsiveness to ion strength and temperature. Our research has provided a new perspective for the design and fabrication of novel hydrogel actuators with complex deformations.
关键词
动态硼酸酯键模块化组装水凝胶驱动器离子强度响应温度响应
Keywords
Dynamic boronic ester bondsBuilding block assemblyHydrogel actuatorIonic strength-responsivenessThermo-responsiveness
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