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Download filePressure-Sensitive Adhesive with Enhanced and Phototunable Underwater Adhesion
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posted on 2021-10-15, 17:11 authored by Yongsen Zhou, Chao Zhang, Shouwei Gao, Wanbo Li, Ji-jung Kai, Zuankai WangPressure-sensitive
adhesives (PSAs) are extensively used in diverse
applications such as semiconductor manufacturing, labeling, and healthcare
because of their quick and viscoelasticity-driven physical adhesion
to dry surfaces. However, most of the existing PSAs normally fail
to maintain or even establish adhesion under harsh conditions, particularly
underwater, due to the lack of robust chemical functionalities for
chemistry-based adhesion. Meanwhile, these PSAs are incapable of altering
the adhesion in response to external stimuli, limiting their employment
in applications requiring dynamic adhesion. Here, we develop a chemically
functionalized PSA (f-PSA) with enhanced and phototunable underwater
adhesion by incorporating an underwater adhesion enhancer (i.e., mussel-inspired
catechol) and a photoresponsive functionality (i.e., anthracene) into
a standard acrylic PSA matrix. The synergistic coupling of viscoelasticity-driven
physical adhesion originating from the matrix with catechol-enabled
chemical adhesion secures sufficient interfacial molecular interactions
and leads to enhanced underwater adhesion. The efficient dimerization
of anthracene via light-triggered cycloaddition facilely mediates
the viscoelastic property of f-PSA, rendering the phototunable adhesion.
We envision that this f-PSA can open up more opportunities for applications
such as underwater manipulation, transfer printing, and
medical adhesives.
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robust chemical functionalitiese ., mussele ., anthraceneanthracene via lighteven establish adhesiondriven physical adhesionunderwater adhesion enhancerchemically functionalized psaphototunable underwater adhesionenhanced underwater adhesionphototunable adhesionunderwater manipulationparticularly underwaterbased adhesionviscoelastic propertytransfer printingsynergistic couplingsensitive adhesivessensitive adhesivesemiconductor manufacturingphotoresponsive functionalitymedical adhesivesharsh conditionsexternal stimuliextensively usedefficient dimerizationdry surfaces