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  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
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Hybrid starch/silica films with improved mechanical properties

Journal of Sol-Gel Science and Technology volume 95, pages 52–65 (2020)Cite this article

Abstract

Environmental concern has increased the research in development of biodegradable packaging. Although there are many reports about starch films, their physicochemical properties need to be improved, and the introduction of an inorganic compound is an alternative to be applied. However, there are few reports about the development of biodegradable hybrid organic–inorganic films for food packaging. Therefore, the preparation of biodegradable films was proposed by using sol–gel and casting techniques, based on starch and glycerol as plasticizers, with the incorporation of an alkoxide precursor containing silicon, TEOS (tetraethyl orthosilicate) in different concentrations. Morphological, thermal, optical, and mechanical properties, water solubility, swelling, and water vapor permeability were evaluated. The addition of TEOS was more efficient when it underwent pre-hydrolysis before incorporation into the film-forming solution, significantly interfering with the results of mechanical, optical, and barrier properties. The silica phase was uniformly incorporated into the polymer, presenting micrometric domains. The hybrid films produced have satisfactory properties for application as biodegradable packaging.

Highlights

  • The addition of silica moiety increased by up to 109% the tensile strength of hybrid films.

  • Other properties of the hybrid films were also improved with the addition of silica microdomains.

  • Better biodegradable film properties will open new possibilities for use like rigid package.

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Acknowledgements

This research was financially supported by Brazilian agencies Fundação de Amparo à Pesquisa do Estado do RS (FAPERGS), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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Authors and Affiliations

  1. Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal do Rio Grande do Sul, UFRGS, Porto Alegre, RS, 91501-970, Brazil

    Camila Horst & Tania Maria Haas Costa

  2. Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS, Porto Alegre, RS, 91501-970, Brazil

    Camila Horst & Tania Maria Haas Costa

  3. Instituto de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul, UFRGS, Porto Alegre, RS, 91501-970, Brazil

    Carlos Henrique Pagno & Simone Hickmann Flores

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  1. Camila Horst
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  2. Carlos Henrique Pagno
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  3. Simone Hickmann Flores
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  4. Tania Maria Haas Costa
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Correspondence to Tania Maria Haas Costa.

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Horst, C., Pagno, C.H., Flores, S.H. et al. Hybrid starch/silica films with improved mechanical properties. J Sol-Gel Sci Technol 95, 52–65 (2020). https://doi.org/10.1007/s10971-020-05234-x

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  • DOI: https://doi.org/10.1007/s10971-020-05234-x

Keywords

  • Biodegradable films
  • Packaging
  • Mechanical properties
  • Organic–inorganic films