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Structure-property behavior during aging of sol-gel-derived silica modified with Si–H and Si–CH3 groups

Published online by Cambridge University Press:  31 January 2011

Vincenzo M. Sglavo ,
Sandra Diré  and
Maurizio Ferrari
Vincenzo M. Sglavo
Affiliation:
Dipartimento di Ingeneria dei Materiali, Università di Trento, Via Mesiano 77, I-38050 Trento, Italy
Sandra Diré
Affiliation:
Dipartimento di Ingeneria dei Materiali, Università di Trento, Via Mesiano 77, I-38050 Trento, Italy
Maurizio Ferrari
Affiliation:
CNR–CeFSA, Centro Fisica Stati Aggregati, Via Sommarive 14, I-38050 Povo (TN), Italy
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Abstract

Unsupported films and thin rods were prepared by the sol-gel method from solutions of triethoxysilane and methyldiethoxysilane. Measurements of elastic modulus, density, glass transition temperature, and refractive index were performed at different aging times. Results showed a large increase of the elastic modulus with aging time, which was related to the progressive condensation taking place in the xerogel network, as shown by solid-state nuclear magnetic resonance (NMR). The stiffness increase was shown to correspond to higher glass transition temperature and larger density and refractive index. Different increasing rates of the physical and mechanical characteristics were observed for films and rods during aging. This behavior was related to the different loss rate of the pore liquid, which affects the network evolution in the wet gel.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 2100 - 2106
Copyright
Copyright © Materials Research Society 1999

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