resumo
In this study we report a series of partially biobased new (hetero)aromatic copolyesters, namely poly(ethylene-bis(ethyl 2-furoate)-co-ethylene 5-nitroisophthalate)s synthesised via the two-step melt polycondensation process, by combining commercially available dimethyl 5-nitroisophthalate and a biobased bisfuranic diester derivative (DEF), and ethylene glycol. Their expected molecular structure was confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. All copolyesters display excellent thermal stability and a glass transition temperature (T-g) up to 72 degrees C, decreasing slightly with the increasing amount of the nitro derivative content. Furthermore, these copolyesters revealed to be essentially amorphous materials. The hydrolytic degradation was investigated for all copolyesters at 37 degrees C and the oxidative degradation only for the copolyester containing theoretically equimolar amount c.a. PEBF50NI50.The oxidative degradation shows well weight loss up to 56wt.% after 15 days of incubation, confirmed by H-1 NMR analysis.
palavras-chave
POLY(ETHYLENE-TEREPHTHALATE) COPOLYMERS; HYDROLYTIC DEGRADATION; FURANIC UNITS; POLYESTERS
categoria
Polymer Science
autores
Bougarech, A; Zaidi, S; Sousa, AF; Abid, S; Silvestre, AJD; Abid, M
nossos autores
Andreia Fernandes de Sousa
Investigador Auxiliar
Armando Jorge Domingues Silvestre
Professor Catedráticoagradecimentos
The authors acknowledge the financial support of the Ministry of Higher Education and Scientific Research in Tunisia.