Reconfigurable surface patterns on covalent adaptive network polymers using nanoimprint lithography |
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Authors: | Lewis M. Cox Zhengwei Li Nancy Sowan Devatha Nair Jianliang Xiao Christopher N. Bowman Yifu Ding |
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Affiliation: | 1. Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0427, USA;2. Material Science and Engineering Program, University of Colorado, Boulder, CO 80309-0596, USA;3. Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309-0596, USA;4. Department of Ophthalmology, School of Medicine, University of Colorado, Denver, CO 80045, USA |
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Abstract: | Covalent adaptable networks (CANs) are cross-linked polymers capable of relieving internal stresses by reconfiguring their network topology. Specifically, reversible addition-fragmentation chain transfer (RAFT) is a mechanism by which covalent bonds are exchanged to relieve internal stresses. While stress relaxation in such systems has been studied in bulk materials, here, we characterize the ability of RAFT-based CANs to undergo direct mechano-patterning of sub-micron surface topologies via nanoimprint lithography. The effects that different imprinting parameters and material properties have on the achievable surface pattern geometries are investigated, and we provide the first demonstration of permanent sub-micron surface reconfiguration on crosslinked polymers, which exhibit features orders of magnitude smaller than any previously published. |
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Keywords: | Covalent adaptive network Reconfigurable surface pattern Nanoimprint lithography |
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