resumo
CaCO3/cellulose nanocomposite materials were prepared by the controlled reaction of CaCl2 with dimethylcarbonate ((CH3)(2)CO3) in alkaline medium in the presence of cellulose fibers. The effect of several reaction parameters, such as reaction time, temperature, fiber mass fraction and extent of cellulose modification (carboxymethylation), on the final properties of the nanocomposites was investigated by ICP-AES, FT-IR, XRD, SEM, TGA, ToF-SIMS and XPS. The results showed that the hydrolysis conditions strongly influenced the quantity and morphology of CaCO3 particles deposited at the surface of cellulosic fibers. Under specific experimental conditions, the substrate promoted the selective control growth of CaCO3 at the surface of the fibers. The use of these CaCO3/cellulose nanocomposites as reinforcing materials in polyethylene (PE) based composites was also tested. Preliminary DMA studies showed a much higher mechanical performance for the composites with the CaCO3/cellulose fibers nanocomposites as compared to cellulose fibers. (c) 2009 Elsevier Ltd. All rights reserved.
palavras-chave
CALCIUM-CARBONATE POLYMORPHS; CELLULOSE FIBERS; TOF-SIMS; XPS; BIOMINERALIZATION; CRYSTALLIZATION; PARTICLES; SURFACES; FILLERS; GROWTH
categoria
Chemistry; Polymer Science
autores
Vilela, C; Freire, CSR; Marques, PAAP; Trindade, T; Neto, CP; Fardim, P
nossos autores
Carla Vilela
Professor Auxiliar
Carlos Pascoal Neto
Diretor do Raiz
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
Tito Trindade
Professor Catedráticoagradecimentos
The authors wish to thank the European Commission (SUSTAIN-PACK IP-500311-2) and Fundacao para a Ciencia e a Tecnologia (POCI 2010 and REEQ/515/CTM/2005) for the financial support of this work.