Departamento de Eng. Química e Eng. de Alimentos - Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil; Departamento de Ciência e Tecnologia de Alimentos - Universidade Estadual de Londrina, Londrina, Rod. Celso Garcia Cid (PR 445), Km 380, P.O. Box 6001, CEP 86051-990, Londrina, PR, Brazil.
Departamento de Eng. Química e Eng. de Alimentos - Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
Carbohydr Polym. 2012 Jun 20;89(2):504-10. doi: 10.1016/j.carbpol.2012.03.035. Epub 2012 Mar 22.
The aim of this study was to produce thermoplastic starch (TPS) films and to enhance their properties by reinforcing them with hydrophilic and hydrophobic nanoclays. TPS films were prepared by extrusion and thermopressing, and their crystallinity, water vapor permeability (WVP), and mechanical properties were studied. The hydrophilic nanoclay lowered the material WVP due to the formation of an intercalated composite. The hydrophobic nanoclays increased the rigidity of the films but did not alter the tensile strength. The blending of nanoclays with thermoplastic starch modifies the mechanical properties and WVP, and these changes are strongly associated with the dispersion of nanoclay in the polymer matrix. The dispersion, in turn, depends on the compatibility of the matrix and the nanoclay in terms of the hygroscopicity and the concentration in which the nanoclay is used. The addition of nanoclays to starch-based films is a promising way to enhance them for industrial manufacture.
本研究旨在制备热塑性淀粉（TPS）薄膜，并通过增强亲水性和疏水性纳米黏土来改善其性能。通过挤出和热压制备 TPS 薄膜，并研究其结晶度、水蒸气透过率（WVP）和力学性能。亲水性纳米黏土由于形成插层复合材料而降低了材料的 WVP。疏水性纳米黏土增加了薄膜的刚性，但没有改变拉伸强度。纳米黏土与热塑性淀粉共混可改变机械性能和 WVP，这些变化与纳米黏土在聚合物基质中的分散密切相关。而分散又取决于基质和纳米黏土在吸湿性和纳米黏土使用浓度方面的相容性。向淀粉基薄膜中添加纳米黏土是一种很有前途的方法，可以提高它们的工业制造性能。
