Van Lijsebetten, Filip; De Bruycker, Kevin; Spiesschaert, Yann; Winne, Johan M.; Du Prez, Filip E. published the artcile< Suppressing Creep and Promoting Fast Reprocessing of Vitrimers with Reversibly Trapped Amines>, Related Products of 112-63-0, the main research area is vitrimer amine polymer network creep; Creep-Resistance; Recyclable Thermoset; Transamination; Vinylogous Urethane; Vitrimers.
We report a straightforward chem. strategy to tackle current challenges of irreversible deformation in low Tg vitrimers at operating temperature In particular, vinylogous urethane (VU) vitrimers were prepared where reactive free amines, necessary for material flow, were temporarily shielded inside the network backbone, by adding a small amount of dibasic ester to the curing mixture The amines could be released as reactive chain ends from the resulting dicarboxamide bonds via thermally reversible cyclisation to an imide moiety. Indeed, (re)generation of the required nucleophilic amines as network defects ensured reprocessing and rapid material flow at higher temperature, where exchange dynamics are (re)activated. As a result, VU vitrimers were obtained with limited creep at service temperature, yet with good reprocessability at elevated temperatures Thus, by exerting strong control on the mol. level over the availability of exchangeable functional groups, a remarkable improvement of VU properties was obtained.
Angewandte Chemie, International Edition published new progress about Activation energy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics