Delahaye, Maarten; Tanini, Flaminia; Holloway, Joshua O.; Winne, Johan M.; Du Prez, Filip E. published the artcile< Double neighbouring group participation for ultrafast exchange in phthalate monoester networks>, Electric Literature of 112-63-0, the main research area is phthalate monoester network ultrafast exchange thermal mech rheol property.
Phthalate monoesters (PMEs) were recently introduced as a simple dynamic covalent bond for implementation in covalent adaptable networks (CANs), which undergo rapid transesterifications in the absence of catalysts, due to the neighboring group participation (NGP) of a carboxylic acid moiety. In this work, it is shown that the PME transesterification can be very significantly accelerated by the presence of another neighboring group on the reactive alc. moieties. The kinetic effects are demonstrated using a short model study of PMEs with different substituents at the β-carbon position, showing a remarkable acceleration for alcs. containing tertiary amines on the β-carbon. Following the model study, materials were synthesized by a (partial) replacement of the conventionally used diol with a β-amino-diol, leading to the formation of networks with an increased Tg and Young’s-modulus, which is rationalized as a result of the formation of an ionic network (COO- and NHR3+). Stress relaxation experiments show a decrease in relaxation times by a factor of 500, compared to similar networks derived from non-amine-substituted hydroxyl monomers. This ultrafast relaxation, enabled by a double NGP, resulted in CANs that show potential to be processed through extrusion while maintaining their overall network connectivity.
Polymer Chemistry published new progress about Creep. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics