resumo
Polyesters made from 2,5-furandicarboxylic acid (FDCA) have been in the spotlight due to their renewable origins, together with the promising thermal, mechanical, and/or barrier properties. Following the same trend, (nano) composite materials based on FDCA could also generate similar interest, especially because novel materials with enhanced or refined properties could be obtained. This paper presents a case study on the use of furanoate-based polyesters and bacterial cellulose to prepare nanocomposites, namely acetylated bacterial cellulose/poly(butylene 2,5-furandicarboxylate) and acetylated bacterial cellulose/poly(butylene 2,5-furandicarboxylate)-co-(butylene diglycolate)s. The balance between flexibility, prompted by the furanoate-diglycolate polymeric matrix; and the high strength prompted by the bacterial cellulose fibres, enabled the preparation of a wide range of new nanocomposite materials. The new nanocomposites had a glass transition between 25-46 degrees C and a melting temperature of 61-174 degrees C; and they were thermally stable up to 239-324 degrees C. Furthermore, these materials were highly reinforced materials with an enhanced Young's modulus (up to 1239 MPa) compared to their neat copolyester counterparts. This was associated with both the reinforcing action of the cellulose fibres and the degree of crystallinity of the nanocomposites. In terms of elongation at break, the nanocomposites prepared from copolyesters with higher amounts of diglycolate moieties displayed higher elongations due to the soft nature of these segments.
palavras-chave
POLY(ETHYLENE 2,5-FURANDICARBOXYLATE) PEF; PHYSICAL-PROPERTIES; CRYSTALLIZATION BEHAVIOR; MECHANICAL-PROPERTIES; RENEWABLE RESOURCES; COPOLYESTERS; POLYESTERS; DICARBOXYLATE); SUBSTITUTION; MEMBRANES
categoria
Polymer Science
autores
Matos, M; Sousa, AF; Silva, NHCS; Freire, CSR; Andrade, M; Mendes, A; Silvestre, AJD
nossos autores
Andreia Fernandes de Sousa
Investigador Auxiliar
Armando Jorge Domingues Silvestre
Professor Catedrático
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
Marina Matos
Investigador Júnior
Nuno Helder da Cruz Simões Silva
Investigadoragradecimentos
FCT and POPH/FSE are gratefully acknowledged for funding a doctoral grant to M.M. (PD/BD/52501 /2014), post-doctoral grant to A.F.S. (SFRH/BPD/73383/2010) and a Researcher Contract to C.F. (IF)/01407/2012). M.A. is thankful to POCI-01-0145-FEDER-006939 (Laboratory for Process Engineering, Environment, Biotechnology and Energy UID/EQU/00511 /2013) funded by the European Regional Development Fund (ERDF), through COMPETE2020 Programa Operacional Competitividade e Internacionalizacao (POCI), and by national funds, through FCT Fundacao para a Ciencia e a Tecnologia and NORTE-01-0145-FEDER-000005 LEPABE-2-ECO-INNOVATION, supported by the North Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) for the fellowship grant. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.