resumo
A rapid and ecofriendly microwave assisted p-dodecylbenzenesulfonic acid (DBSA) emulsion polycondensation of long-chain suberin model comonomers was successfully carried out for the first time. Microwave irradiation reduced drastically the reaction time to only 15 min, compared with the DBSA/water polycondensation under conventional heating. Bulk polycondensation using CALB lipase or Bi(OTf)(3) were also carried out with isolation yields up to 93% and number-average molecular weights up to around 7300.
palavras-chave
DEHYDRATION REACTIONS; DICARBOXYLIC-ACIDS; MOLECULAR-WEIGHT; CARBOXYLIC-ACIDS; DIOLS; POLYCONDENSATIONS; WATER; BIOPOLYESTERS; MONOMERS; SOLVENT
categoria
Polymer Science
autores
Sousa, AF; Silvestre, AJD; Gandini, A; Neto, CP
nossos autores
Alessandro Gandini
Investigador
Andreia Fernandes de Sousa
Investigador Auxiliar
Armando Jorge Domingues Silvestre
Professor Catedrático
Carlos Pascoal Neto
Diretor do RaizProjectos
Laboratório de Análises Térmicas (REEQ/515/CTM/2005)
Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2011-2012) (PEst-C/CTM/LA0011/2011)
agradecimentos
The authors acknowledge FCT for a post-doctoral grant to A. F. S. [SFRH/BPD/73383/2010]. We thank Professor Diana C. G. A. Pinto for her indispensable help in the microwave reactions. We thank PNRC of FCT for analytical instrumentation support [POCI 2010, FEDER, REEQ/515/CTM/2005 POCI]. The authors wish to thank to 7th Framework Programme FP7/2007-2013, for funding project AFORE: Forest biorefineries: Added-value from chemicals and polymers by new integrated separation, fractionation and upgrading technologies (CP-IP 228589-2). We also thank CICECO for funding project Pest-C/CTM/LA0011/2011.