Autor segons l'article: Roig, Adria; Petrauskaite, Aina; Ramis, Xavier; De la Flor, Silvia; Serra, Angels
Departament: Enginyeria Mecànica Química Analítica i Química Orgànica
Autor/s de la URV: De la Flor Lopez, Silvia / Roig De Arespacochaga, Anna / Serra Albet, Maria Angels
Paraules clau: Shape-memory Polymers Hydrogels Exchange Epoxy Dynamers
Resum: New acylhydrazone vitrimeric-type materials have been studied. These materials can be efficiently relaxed, without the addition of an external catalyst, through an exchange process that has been confirmed as imine metathesis, which differs from the previously reported transimination process in linear polymers. This is the first article that develops vitrimers with high T-g and fast relaxation based on poly(acylhydrazone)s. These materials have been prepared by condensing stoichiometric amounts of glycidyl vanillin and aliphatic dihydrazides of different chain lengths. The curing reaction takes advantage of the different reactivity of formyl and glycidyl groups and proceeds in two sequential steps: a first condensation of the formyl group of vanillin with dihydrazide monomers at low temperature followed by reaction of the remaining hydrazides with the epoxide, which requires temperatures above 150 degrees C. The complete disappearance of the initial reactive groups has been confirmed by FTIR spectroscopy. The thermomechanical characteristics have been evaluated by DMTA, obtaining T(g)s above 100 degrees C for the materials prepared, which present excellent vitrimeric features with very short relaxation times. Using model compounds, we were able to demonstrate that imine metathesis is responsible for the exchange process. The thermal stability of these materials has been rated by TGA. Poly(acylhydrazone) materials showed good recycling and self-healing abilities and could be hydrolyzed in an acidic medium.
Àrees temàtiques: Química Polymers and plastics Polymer science Organic chemistry Engenharias ii Biomedical engineering Bioengineering Biochemistry
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
Adreça de correu electrònic de l'autor: angels.serra@urv.cat silvia.delaflor@urv.cat
Identificador de l'autor: 0000-0003-1387-0358 0000-0002-6851-1371
Data d'alta del registre: 2024-11-02
Versió de l'article dipositat: info:eu-repo/semantics/submittedVersion
Enllaç font original: https://pubs.rsc.org/en/content/articlelanding/2022/py/d1py01694f
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Polymer Chemistry. 13 (11): 1510-1519
Referència de l'ítem segons les normes APA: Roig, Adria; Petrauskaite, Aina; Ramis, Xavier; De la Flor, Silvia; Serra, Angels (2022). Synthesis and characterization of new bio-based poly(acylhydrazone) vanillin vitrimers. Polymer Chemistry, 13(11), 1510-1519. DOI: 10.1039/d1py01694f
DOI de l'article: 10.1039/d1py01694f
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2022
Tipus de publicació: Journal Publications