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Synthesis and Characterisation of Polyvinyl alcohol (PVA)/Silica Hybrid Composites Derived Through the Sol-Gel Method in Aqueous Medium: Effect of Acid Content, Silica Content and Viscosity of PVA on the Dispersion Characteristics of Silica and the Physical Properties of the Composites

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Abstract

A cheap and environment friendly route towards the synthesis of Polyvinyl alcohol/silica hybrid composites is presented. Polyvinyl alcohol/silicate hybrid materials were synthesised in aqueous medium by the sol-gel method using dil HCl (0.5 N) as catalyst and a cost-effective silica source sodium silicate. The synthesis method was aimed at enhancing the rate of co-condensation of silica within the polyvinyl alcohol matrix. Transparent and flexible hybrid films of homogenous thickness were obtained after gelation at 45°C for 24 h and extended drying for another 48 h. The hybrid composites were characterised by fourier transform infrared spectroscopy (FTIR), scanning electron microscopoy (SEM), thermogravimeric analysis (TGA), tensile strength, elongation at break and water uptake measurements. SEM micrographs revealed that silica was dispersed in the PVA matrix without the large aggregation of particles for a molar composition of 0.0004 PVA:0.048 Sodium silicate: 0.004 HCl.

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  1. Department of Chemical Sciences, Tezpur University, Assam, India, 784028

    Tapasi Kotoky & S.K. Dolui

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  1. Tapasi Kotoky
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  2. S.K. Dolui
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Kotoky, T., Dolui, S. Synthesis and Characterisation of Polyvinyl alcohol (PVA)/Silica Hybrid Composites Derived Through the Sol-Gel Method in Aqueous Medium: Effect of Acid Content, Silica Content and Viscosity of PVA on the Dispersion Characteristics of Silica and the Physical Properties of the Composites. Journal of Sol-Gel Science and Technology 29, 107–114 (2004). https://doi.org/10.1023/B:JSST.0000023011.15323.45

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  • DOI: https://doi.org/10.1023/B:JSST.0000023011.15323.45

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