VITREOUS STATE DECOMPOSITION STUDY IN SOME AQUEOUS POLYALCOHOLS SOLUTIONSReportar como inadecuado




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Abstract : The aim of this work is to present an experimental study of the stability of vitreous state obtained after quenching at 77 K in the case of both aqueous glycerol and 1,2-propanediol solutions. This study has been performed by means of internal friction measurements and X ray observations, i.e., X ray diffraction and small angle X ray scattering. By means of annealing treatments, it has been possible to point out two mechanisms for the decomposition of vitreous state : - first, involving ice crystallization with three temperature domains corresponding to i nucleation ii nucleation and growth where cubic to hexagonal ice transformation occurs iii Ostwald ripening mechanisms are evidenced. - second, involving a vitreous state being decomposed into two vitreous phases having a different water concentration.





Autor: R. Vassoille G. Vigier A. El Hachadi G. Thollet J. Perez

Fuente: https://hal.archives-ouvertes.fr/



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