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Thermally Healable and Reprocessable Bis(hindered amino)disulfide-Cross-Linked Polymethacrylate Networks
journal contribution
posted on 2017-11-01, 14:18 authored by Akira Takahashi, Raita Goseki, Kohzo Ito, Hideyuki OtsukaA facile
approach to polymethacrylate networks that contain thermally
exchangeable bis(2,2,6,6-tetramethylpiperidin-1-yl)disulfide (BiTEMPS)
cross-linkers is reported, and the easily inducible healability and
reprocessability of the obtained networks are discussed. The free
radical polymerization of BiTEMPS cross-linkers and hexyl methacrylate
(HMA) monomers afforded insoluble and colorless networks of poly(hexyl
methacrylate) (PHMA) films, whose structures were characterized after
de-cross-linking via thermal BiTEMPS exchange reactions with added
low-molecular-weight BiTEMPS. Swelling experiments and stress-relaxation
measurements at elevated temperatures revealed the contribution of
BiTEMPS as a polymer chain exchanger both in the gels and in the bulk.
The BiTEMPS-cross-linked PHMA networks showed damage healability and
repeatable reprocessability in the bulk by simple hot pressing at
120 °C under mild pressure (∼70 kPa). These results should
grant facile access to various vinyl polymer networks with on-demand
malleability.
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damage healabilityBiTEMPS-cross-linked PHMA networkspolymethacrylate networkson-demand malleabilitypolymer chain exchangerhexyl methacrylateThermally Healablelow-molecular-weight BiTEMPSstress-relaxation measurementsbulkrepeatable reprocessabilitySwelling experimentsvinyl polymer networksBiTEMPS exchange reactionsBiTEMPS cross-linkersinducible healability
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