resumo
The main purpose of this study was to investigate the potential of suberin (a naturally occurring aromatic-aliphatic polyester ubiquitous to the vegetable realm) as a renewable source of chemicals and, in particular, to assess their physical properties. A comparison between cork and birch suberin fragments obtained by conventional depolymerisation processes (hydrolysis or methanolysis) is provided, focusing essentially on their thermal and crystallinity properties. It was found that suberin fragments obtained by the hydrolysis depolymerisation of birch had a high degree of crystallinity, as indicated by their thermal analysis and corroborated by the corresponding XRD diffractions, as opposed to hydrolysis-depolymerised cork suberin counterparts, which were essentially amorphous. (C) 2016 Elsevier B.V. All rights reserved.
palavras-chave
IONIC LIQUIDS; CORK; BIOPOLYESTERS; POLYURETHANES; METHANOLYSIS; URETHANES; CHEMICALS; PLANTS; WAXES
categoria
Biochemistry & Molecular Biology; Chemistry; Polymer Science
autores
Sousa, AF; Gandini, A; Caetano, A; Maria, TMR; Freire, CSR; Neto, CP; Silvestre, AJD
nossos autores
Ana Caetano
Estudante de doutoramento
Andreia Fernandes de Sousa
Investigador Auxiliar
Armando Jorge Domingues Silvestre
Professor Catedrático
Carlos Pascoal Neto
Diretor do Raiz
Carmen Sofia da Rocha Freire Barros
Investigador Coordenadoragradecimentos
The authors are grateful to Professor M. E. S. Eusebio of University of Coimbra, Portugal, for valuable assistance in the polarised-light thermal microscopy analysis studies. FCT (Fundacao para a Ciencia e Tecnologia) and POPH/FSE are also acknowledge for the postdoctoral grants to AFS (SFRH/BPD/73383/2010); and research grant to CSRF (IF/01407/2012) under the program Investigador FCT 2012'. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and, when appropriate, co-financed by FEDER under the PT2020 Partnership Agreement.