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Open AccessArticle

Effects of Organic Modification of Montmorillonite on the Properties of Hydroxypropyl Di-Starch Phosphate Films Prepared by Extrusion Blowing

by Yang Qin 1,†, Wentao Wang 1,2,†, Hui Zhang 1,2, Yangyong Dai 1,2, Hanxue Hou 1,2,* and Haizhou Dong 1,2,*
1
Department of Food Science and Engineering, Shandong Agricultural University, 61 Daizong Street, Tai’an 271000, China
2
Engineering and Technology Center for Grain Processing of Shandong Province, Tai’an 271000, China
*
Authors to whom correspondence should be addressed.
Yang Qin and Wentao Wang contributed equally to this work and are co-first authors.
Materials 2018, 11(7), 1064; https://doi.org/10.3390/ma11071064
Received: 21 May 2018 / Revised: 17 June 2018 / Accepted: 20 June 2018 / Published: 23 June 2018
(This article belongs to the Special Issue Green Composites: Preparation, Properties, and Applications)
The knowledge gained from starch-nanocomposite-film research has not been fully applied commercially because of the lack of appropriate industrial processing techniques for nanofillers and starch films. Three organically modified montmorillonites (OMMTs) were prepared using a semidry kneading method. The effects of the OMMTs on the structures and properties of starch nanocomposite films, prepared by extrusion blowing, were investigated. The X-ray diffraction (XRD) analysis results revealed that the OMMTs with various quaternary ammonium salts possessed differing layer structures and d-space values. The results of the XRD and Fourier-transform infrared spectroscopy (FT-IR) showed that the starch–OMMT interaction resulted in a structural change, namely the starch–OMMT films possessed a balanced exfoliated and intercalated nanostructure, while the starch–MMT film possessed an exfoliated nanostructure with non-intercalated montmorillonite (MMT). The results of the solid-state nuclear magnetic resonance (NMR) analysis suggested that the starch-OMMT nanocomposite possessed comparatively large quantities of single-helix structures and micro-ordered amorphous regions. The starch–OMMT films exhibited good tensile strength (TS) (maximum of 6.09 MPa) and water barrier properties (minimum of 3.48 × 10−10 g·m·m−2·s−1·Pa−1). This study indicates that the addition of OMMTs is a promising strategy to improve the properties of starch films. View Full-Text
Keywords: hydroxypropyl di-starch phosphate; montmorillonite; nanocomposite; extrusion blowing hydroxypropyl di-starch phosphate; montmorillonite; nanocomposite; extrusion blowing
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Qin, Y.; Wang, W.; Zhang, H.; Dai, Y.; Hou, H.; Dong, H. Effects of Organic Modification of Montmorillonite on the Properties of Hydroxypropyl Di-Starch Phosphate Films Prepared by Extrusion Blowing. Materials 2018, 11, 1064.

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