Epoxy vitrimers catalyzed by chemically bonded tertiary amines

HOPPE, CRISTINA E.; ALTUNA, FACUNDO I.; WILLIAMS, ROBERTO J.J.

Mar del Plata

Simposio; XVI SIMPOSIO LATINOAMERICANO DE POLÍMEROS Y XIV CONGRESO IBEROAMERICANO DE POLÍMEROS; 2018

INTEMA (CONICET-UNMdP)

Vitrimers are polymer networks, where some of thecrosslinking points are formed by dynamic covalentbonds that can undergo exchange reactions whensubjected to the proper external stimulus. The firstepoxy vitrimers were developed by Leibler et al., usingpoly carboxylic acids as crosslinker and Zn+2 ascatalysts.1 The thermally activated transesterificationsbetween the 2-hydroxyesters obtained through theepoxy-carboxylic acid reaction allow the crack healing,reprocessing and recycling of these materials . Othercatalysts such as guanidines,2 triphenylphosphine,2 1-methylimidazole3 and stannous octoate4 have alsobeen used for epoxy vitrimers. In this work we presentepoxy vitrimers catalyzed by covalently bonded tertiaryamines, generated through the reaction of the epoxyresin with primary or secondary amines. The relationsbetween the network structure, the amine substituentsand the vitrimer properties were analyzed.