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Sunday, 29 May 2016

Effects of various nanomaterials on the properties of starch/poly(vinyl alcohol) composite films formed by blow extrusion process

Published Date
, Volume 24, Issue 8, pp 687-696
First online: 

Title 

Effects of various nanomaterials on the properties of starch/poly(vinyl alcohol) composite films formed by blow extrusion process

  • Author 
  • Wentao Wang
  • , Hui Zhang
  • , Yangyong Dai
  • , Hanxue Hou
  • , Haizhou Dong

    Cover Date
    2015-08

    DOI
    10.1007/s13726-015-0359-7

    Print ISSN
    1026-1265

    Online ISSN
    1735-5265

    Publisher
    Springer Berlin Heidelberg

    Author Affiliations
  • 1. Department of Food Science and Engineering, Shandong Agricultural University, Tai’an, 271018, People’s Republic of China


Abstract

Effects of various nanomaterials on the physical and mechanical properties of hydroxypropyl distarch phosphate/poly(vinyl alcohol) (starch/PVA) composite films fabricated by blow extrusion were investigated. The starch/PVA nanocomposite films were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA/DTG), FTIR, and scanning electron microscope (SEM). The nanocomposite films containing nano-CaCO3 and organically modified montmorillonite (OMMT) showed the lowest and highest tensile strengths of 3.72 and 7.04 MPa, respectively. The film containing natural montmorillonite (MMT) exhibited the lowest elongation-at-break of 118.73 %. The film with OMMT exhibited the lowest water vapor permeability of 4.12 × 10−10 g m−1 s−1 Pa−1. Addition of nano-TiO2 to starch/PVA films resulted in a significant decrease in ∆E*(increased clearness). Differential scanning calorimetry (DSC) indicated that the nanocomposite films exhibited higher glass transition temperatures (T g) and lower melting enthalpy compared to the control film. Adding MMT and OMMT to starch/PVA blends increased the thermal stabilities of the films according to the TGA/DTG analysis. Agglomeration of particles was observed in the starch/PVA composite films containing nano-CaCO3 and nano-TiO2while nano-SiO2 and MMT dispersed well in the matrix. On the whole, OMMT was more compatible with starch/PVA blends and served as a better nanomaterial to prepare starch/PVA nanocomposite films which was superior to that of the other four nanomaterials.

Keywords

Starch Poly(vinyl alcohol) Nanocomposite Film blowing Properties

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http://link.springer.com/article/10.1007%2Fs13726-015-0359-7
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