Citation: Li-xue Xiang, Chang-yu Tang, Jing Cao, Chao-yu Wang, Ke Wang, Qin Zhang, Qiang Fu. PREPARATION AND CHARACTERIZATION OF SOY PROTEIN ISOLATE (SPI)/ MONTMORILLONITE (MMT) BIONANOCOMPOSITES[J]. Chinese Journal of Polymer Science, ;2009, 27(6): 843-849. shu

PREPARATION AND CHARACTERIZATION OF SOY PROTEIN ISOLATE (SPI)/ MONTMORILLONITE (MMT) BIONANOCOMPOSITES

Received Date: 17 September 2008
Revised Date: 1 December 2008

The bionanocomposites of soy protein isolate (SPI)/montmorillonite (MMT) have been prepared successfully via simple melt mixing, in which MMT was used as nanofiller and glycerol was used as plasticizer. Their structures and properties were characterized with X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), thermogravimetric analysis and tensile testing. XRD、TEM and SEM results indicated that the MMT layers could be easily intercalated by the SPI matrix even by simple melt processing. The exfoliated MMT layers were randomly dispersed in the protein matrix as MMT content was low (less than 5 wt%), an incomplete exfoliation was evident from SEM results, and some primary particles were observed as the MMT content was high (from 5 wt% to 9 wt%). A significant improvement of the mechanical strength and thermal stability of SPI/MMT nanocomposites has been achieved. Our work suggests that simple melt processing is an efficient way to prepare SPI/MMT nanocomposites with exfoliated structure.
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