Dynamic shear rheological study of soy protein isolate/poly(vinyl alcohol) bionanocomposites reinforced with montmorillonite nanoparticles

Abstract

Conventional nonbiodegradable thermoplastic polymers are mainly utilized by industries for edible and nonedible packaging applications. Various polysaccharides such as soy protein isolate (SPI) were used as a biodegradable polymer on behalf of synthetic polymers. Polysaccharides have superior water vapor permeability properties as compared with other synthetic polymers. In the present study, rheological characterization of SPI/poly(vinyl alcohol) (SPI/PVA) based biocomposite and bionanocomposites were performed. Ecofriendly biocomposite and bionanocomposites were successfully prepared via solution casting technique. Montmorillonite (MMT) was used as a nanofiller to enhance the characteristics of the SPI/PVA matrix. The rheological tests have been carried out to evaluate the viscoelastic behavior of biocomposite and bionanocomposites. Scanning electron microscope (SEM) and polarizing optical microscope (POM) images were evaluated to define dispersion of SPI and MMT in the PVA matrix. The shear-thinning behavior of prepared samples was determined by measuring the viscosity of the polymeric solution. The frequency sweep test was done to govern the long term stability of SPI/PVA/ MMT bionanocomposites. SPI/PVA/MMT (0.7% NC) nanocomposite is more stable in contrary to other prepared biocomposite and bionanocomposites. An amplitude sweep test was conducted to define the linear viscoelastic region.The viscosity of synthesized biocomposite and bionanocomposites was decreased as the shear rate increased at room temperature. Low-cost biocomposite and bionanocomposites have been developed. It is a potential material that has been used as a coating material in the wood and paper industry.

Preparation and physicochemical properties of coenzyme Q10 loaded niosomal hydrogels based on carbomer and scleroglucan

“…The gels were freeze‐dried and observed by SEM. As shown in Figure 5, it can be found that the carbomer gel without SCL had irregular pore structure with a relatively smooth surface 28 . With the increase of SCL content, the pores in the composite gel tended to become more regular with smaller sizes, especially, CBM/SCL 5:4 and 5:5, where the composite gel displayed a highly dense spatial structure.…”

“…As shown in Figure 5, it can be found that the carbomer gel without SCL had irregular pore structure with a relatively smooth surface. 28 With the increase of SCL content, the pores in the composite gel tended to become more regular with smaller sizes, especially, CBM/SCL 5:4 and 5:5, where the composite gel displayed a highly dense spatial structure. This was because the cross-linking density between SCL and CBM increased with the addition of SCL, resulting in a more stable network gel structure.…”