Mechanochemical strengthening of a synthetic polymer in response to typically destructive shear forces
Ashley L. Black Ramirez,Zachary S. Kean,Joshua A. Orlicki,Mangesh Champhekar,Sarah M. Elsakr,Wendy E. Krause,Stephen L. Craig +6 more
TLDR
It is demonstrated here that such mechanochemical reactions can be used to strengthen a polymer subjected to otherwise destructive shear forces, and their implications for the design of materials that actively remodel locally as a function of their physical environment.Abstract:
High shear stresses are known to trigger destructive bond-scission reactions in polymers. Recent work has shown that the same shear forces can be used to accelerate non-destructive reactions in mechanophores along polymer backbones, and it is demonstrated here that such mechanochemical reactions can be used to strengthen a polymer subjected to otherwise destructive shear forces. Polybutadiene was functionalized with dibromocyclopropane mechanophores, whose mechanical activation generates allylic bromides that are crosslinked in situ by nucleophilic substitution reactions with carboxylates. The crosslinking is activated efficiently by shear forces both in solvated systems and in bulk materials, and the resulting covalent polymer networks possess moduli that are orders-of-magnitude greater than those of the unactivated polymers. These molecular-level responses and their impact on polymer properties have implications for the design of materials that, like biological materials, actively remodel locally as a function of their physical environment.read more
Citations
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Intrinsically stretchable and healable semiconducting polymer for organic transistors
Jin Young Oh,Simon Rondeau-Gagné,Simon Rondeau-Gagné,Yu-Cheng Chiu,Yu-Cheng Chiu,Alex Chortos,Franziska Lissel,Ging-Ji Nathan Wang,Bob C. Schroeder,Bob C. Schroeder,Tadanori Kurosawa,Jeffrey Lopez,Toru Katsumata,Toru Katsumata,Jie Xu,Chenxin Zhu,Xiaodan Gu,Xiaodan Gu,Won-Gyu Bae,Yeongin Kim,Lihua Jin,Jong Won Chung,Jong Won Chung,Jeffrey B.-H. Tok,Zhenan Bao +24 more
TL;DR: A design concept for stretchable semiconducting polymers, which involves introducing chemical moieties to promote dynamic non-covalent crosslinking of the conjugated polymers that is able to undergo an energy dissipation mechanism through breakage of bonds when strain is applied, while retaining high charge transport abilities is presented.
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Mechanoresponsive self-growing hydrogels inspired by muscle training
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Biomimetic Self-Healing
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Mechanochemical Activation of Covalent Bonds in Polymers with Full and Repeatable Macroscopic Shape Recovery
Gregory R. Gossweiler,Gihan B. Hewage,Gerardo Soriano,Qiming Wang,Garrett W. Welshofer,Xuanhe Zhao,Stephen L. Craig +6 more
TL;DR: Embedding mechanophores into an elastomeric poly(dimethylsiloxane) (PDMS) network allows for covalent bond activation under macroscopically reversible deformations, and it is shown that bond activation can be repeated over multiple cycles of tensile elongation with full shape recovery.
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Polymers with autonomous life-cycle control
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