Effects of clays with various hydrophilicities on properties of starch-clay nanocomposites by film blowing

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• 作者：Wei Gao ; Haizhou Dong ; Hanxue Hou ; ^{houhanxue@yahoo.com.cn} ; ^{hhx@sdau.edu.cn} ; Hui Zhang
• 关键词：Clays ; Hydrophilicity ; Extrusion blowing ; Nanocomposite film ; Physical and mechanical properties ; Hydroxypropyl distarch phosphate
• 刊名：Carbohydrate Polymers
• 出版年：2012
• 出版时间：17 March, 2012
• 年：2012
• 卷：88
• 期：1
• 页码：321-328
• 全文大小：2205 K

文摘

Effects of clays with various hydrophilicities on the physical and mechanical properties of hydroxypropyl distarch phosphate-nanoclay composite films by extrusion blowing were investigated. Five kinds of organically modified clays with different hydrophilic properties were used in the preparation of starch nanocomposite films. X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed the formation of intercalated nanostructure to a certain extent. With the addition of clays, significantly greater tensile strength (TS, 2.51 MPa) and lower water vapor permeability (WVP, 3.69 ¡Á 10^?0 g m/(m² s Pa)) were obtained. Starch-clay composite films exhibited a lower glass transition temperature (T_g, ?3.8 ¡ãC) and better heat endurance with differential scanning calorimetry (DSC). The addition of clays to starch had a negative effect on the interaction between starch and plasticizer by FTIR spectra. Organically modified clays were helpful in the melting and fracturing of starch granules in the extrusion revealed by a scanning electronic microscope (SEM). The clay with medium hydrophilic property was more suitable for the production of hydroxypropyl distarch phosphate-clay nanocomposite films as an intensifier among the five clays.