Resumo

ABALOS, R.; ERDMANN, E.  e  DESTEFANIS, H.A.. Surface modifications of volcanic glasses (perlites) by water vapor. Lat. Am. appl. res. [online]. 2003, vol.33, n.1, pp.59-62. ISSN 0327-0793.

Hydrothermal treatments on expanded volcanic glasses (perlites) were studied. The main objective of this paper is to obtain an activated surface able to interact with specific chemical substances. The above mentioned treatment consists on exposing the glass surface to water vapor at temperatures over 250°C at the correspondent vapor pressure during different periods of time and for different size of particles. The glass surface modifications were studied by IR, DTA-TG and adsorption techniques. The grade of surface activation was tested by studying the chemical interaction with polysiloxane polymers.

Palavras-chave : glasses; surface modifications; perlite.

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