Resumo

THIRE, Rossana M. S. M. et al. Reduction of hydrophilicity of biodegradable starch-based films by plasma polymerization. Polímeros [online]. 2004, vol.14, n.1, pp.57-62. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14282004000100015.

Due to low cost and excellent biodegradability, the use of starch as a raw material for bioplastic production is growing in interest. However, the properties of starch-based materials are affected by relative humidity during their use and storage due to their hydrophilic character. In this work, thermoplastic cornstarch films were coated by cold plasma technology with a protective thin layer in order to reduce water sensitivity. 1-Butene and 1,3-butadiene were used as monomers for plasma polymerization. Coated films presented a reduction of water absorption up to 80% an increase in contact angle related to water. These results indicated that the coating process reduced significantly the hydrophilic nature of the starch-based materials.

Palavras-chave : Thermoplastic starch; plasma polymerization; atomic force microscopy; hydrophilicity.

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