Reisinger, David published the artcileStreamlined concept towards spatially resolved photoactivation of dynamic transesterification in vitrimeric polymers by applying thermally stable photolatent bases, Formula: C17H28O8S4, the main research area is photoactivation dynamic transesterification vitrimeric polymer thermally stable photolatent base.
Through a well-targeted design, vitrimers are able to reorganise their three-dimensional covalently crosslinked network structure by associative exchange reactions when the so-called topol. freezing transition temperature (Tv) is exceeded. Although in the past decade a vast number of vitrimers have been developed, there is only a very limited number of elaborate strategies for enabling a controlled and spatially resolved onset of the exchange reactions above Tv. Herein, we describe a convenient approach for a locally controllable photoactivation of vitrimeric properties in a covalently crosslinked thiol-epoxy network by the UV-mediated release of a strong amidine base acting as an efficient transesterification catalyst. In contrast to previous work, the applied photolatent catalysts benefit from superior solubility properties, adequate curing characteristics in the non-activated state (the addition of a supplementary catalyst is not required) and an excellent thermal stability. The spatially controlled activation of vitrimeric properties in terms of dynamic transesterification, macroscopically visible as a viscoelastic flow, is demonstrated by stress relaxation studies and a reshaping experiment Moreover, we confirm that an undesired purely thermally induced catalyst release can be entirely excluded.
Polymer Chemistry published new progress about Glass transition temperature. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Formula: C17H28O8S4.
Referemce:
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