Effects of organic modification of montmorillonite on the performance of starch-based nanocomposite films

• Published in: Applied clay science Vol. 99; pp. 201 - 206
• Main Authors: Gao, Yuling, Dai, Yangyong, Zhang, Hui, Diao, Enjie, Hou, Hanxue, Dong, Haizhou
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01.09.2014; Elsevier
• Subjects: Earth sciences; Earth, ocean, space; Exact sciences and technology; Mineralogy; Modification; Montmorillonite; Nanocomposites; Oxidized and acetylated corn starch; Quaternary ammonium salts; Silicates; Oxidized and acetylated corn starch; Modification; Quaternary ammonium salts; Montmorillonite; Nanocomposites; tensile strength; permeability; chemical properties; ammonium; X-ray diffraction; sealing; exhibits; mechanical properties; smectite; montmorillonite; spectroscopy; water vapor; temperature; clay minerals; sheet silicates; silicates; performances
• ISSN: 0169-1317; 1872-9053
• DOI: 10.1016/j.clay.2014.06.033

The objective of this article is to study the effects of six quaternary ammonium salts (QASs) with various chain lengths and head groups on the physico-chemical properties of organically modified montmorillonites (OMts) and their starch nanocomposite films. X-ray diffraction，FT-IR spectroscopy and TGA analysis of the OMts were performed. Mechanical properties, water vapor permeability (WVP) and glass transition temperature (Tg) of the nanocomposite films were determined. A perfect intercalation structure was formed between the QASs and the natural montmorillonite. The QASs with high molecular weight were beneficial to increasing the d-spacing and loaded more mass in the interlayer space. The highest and lowest d-spacing were 3.56nm for D1821Mt and 1.81nm for 1231Mt, respectively. With the increase in the molecular size of the QASs, the starch/OMt composite films exhibited greater tensile strength (TS, 6.16MPa), lower water vapor permeability (WVP, 1.80×10−10g·m / m2·s·Pa), lower glass transition temperature (Tg, 17.1 °C) and better heat-sealing performance. The QASs with large molecular size were more suitable for the production of starch/OMt nanocomposite films. •The d-spacing of OMts was significantly affected by the chain length of modifiers.•The performance of starch films was significantly improved with the addition of OMts.•OMts and modified starches were well compatible.