Contact
    Start Publications Hydrophilicity and physicochemical properties of chemically ...
    ←  Publication Finder
    Attension

    Hydrophilicity and physicochemical properties of chemically modified cassava starch films

    Year: 2017

    Journal: Ind. Crop. Prod., Volume 95, JAN, page 599–607

    Authors: Colivet, J.; Carvalho, R. A.

    Organizations: National Council for Scientific and Technological Development (CNPq) [307143/2013-9]; Organization of American States (OAS); Grupo Coimbra de Universidades Brasileiras (GCUB) in Brazil

    Keywords: Modified starch; Polymeric matrices; Wettability; Surface energy

    The surface properties and microstructure of films composed of chemically modified cassava starches (cross-linked, acetylated and doubly modified) were evaluated in this study. The films were produced using a casting technique with fixed concentrations of starch and sorbitol (4.0 and 1.2 g/100 gin the filmogenic solution, respectively). The hydrophilicity and surface characteristics of the films were analyzed by determining the optical contact angle (theta). The films were also evaluated for surface properties (polarity and nonpolar and polar components), water solubility, and water vapor permeability. It was determined that films produced from cross-linked and acetylated cassava starch showed greater hydrophobicity and better mechanical properties than those prepared with native cassava starch. The films prepared with doubly modified and acetylated cassava starch had a lower surface energy than the film prepared with untreated and cross-linked starch. The results from scanning electron microscopy, infrared spectroscopy and X-ray diffraction demonstrated marked differences between the films, which were dependent on the type of starch. According to the results obtained in this study, the physicochemical properties of films are related to the chemical structure, microstructure and surface properties. (C) 2016 Elsevier B.V. All rights reserved.
    View publication