Organophilic bentonites based on Argentinean and Brazilian bentonites: part 2: potential evaluation to obtain nanocomposites

AUTOR(ES)

Paiva, L. B., Morales, A. R., Branciforti, M. C., Bretas, R. E. S.

FONTE

Braz. J. Chem. Eng.

DATA DE PUBLICAÇÃO

2012-12

RESUMO

This work describes the preparation of composites of polypropylene and organophilic bentonites based on Brazilian and Argentinean bentonites. During the processing of the samples in a twin screw microextruder, torque and pressures of the extruder were accompanied and the viscosity values were calculated. No significant changes in the torque, pressure and viscosity were found for composites prepared with different bentonites. The samples were characterized by XRD and TEM to evaluate the structure and dispersion of the organophilic bentonites. Composites with exfoliated, partially exfoliated and intercalated structures were obtained and correlations between the intrinsic properties of the sodium clays and organophilic bentonites and their influence on the composites were studied. The cation exchange capacity of the sodium bentonites and the swelling capacity of the organophilic bentonites were the most important properties to obtain exfoliated structures in composites. All bentonites showed the potential to obtain polymer nanocomposites, but the ones from Argentina displayed the best results.

Documentos Relacionados

• Organophilic bentonites based on argentinean and Brazilian bentonites: Part 1: influence of intrinsic properties of sodium bentonites on the final properties of organophilic bentonites prepared by solid-liquid and semisolid reactions
• Hybrids membranes with potential for fuel cells – Part 3: extruded films of nanocomposites based on sepiolite and PC/sulfonated PC blends
• Study of the potencial of national and argentinean bentonites to obtasin organophilic bentonites in aqueous dispersion and semi-solid medium to be applied in polymer nanocomposite
• Handbook of Studies on Schizophrenia. Part 1: Epidemiology, Aetiology and Clinical Features. Part 2: Management and Research
• Sports dermatology part 2: swimming and other aquatic sports