Reisinger, David published the artcileIntroduction of Photolatent Bases for Locally Controlling Dynamic Exchange Reactions in Thermo-Activated Vitrimers, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is photolatent base dynamic exchange thermoactivated vitrimer epoxy crosslinking; photoactivation vitrimer transesterification catalyst epoxy thiol; materials science; photochemistry; photolatent base; polymers; vitrimer.
Vitrimers exhibit a covalently crosslinked network structure, as is characteristic of classic thermosetting polymers. However, they are capable of rearranging their network topol. by thermo-activated associative exchange reactions when the topol. freezing transition temperature (Tv) is exceeded. Despite the vast number of developed vitrimers, there is a serious lack of methods that enable a (spatially) controlled onset of these rearrangement reactions above Tv. Herein, we highlight the localized release of the efficient transesterification catalyst 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) by the UV-induced cleavage of a photolatent base within a covalently crosslinked thiol-epoxy network. Demonstrated with stress relaxation measurements conducted well above the network’s Tv, only the controlled release of TBD facilitates the immediate onset of transesterification in terms of a viscoelastic flow. Moreover, the spatially resolved UV-mediated photoactivation of vitrimeric properties is confirmed by permanent shape changes induced locally in the material.
Angewandte Chemie, International Edition published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).
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