Effects of silica on the morphology, structure, and properties of thermoplastic cassava starch/poly(vinyl alcohol) blends

Abstract

Thermoplastic cassava starch (TPS)/poly(vinyl alcohol) (PVA)/silica (SiO2) composites were prepared by a melt‐mixing method. The effects of the content and surface properties of SiO2 on the processing, mechanical properties, thermal stability, morphology, and structure of the TPS/PVA/SiO2 composites were investigated. With increasing SiO2 content, the plasticizing times of the TPS/PVA/SiO2 composites were shortened. After the SiO2 surface was treated with a silane coupling agent (KH550), the plasticizing times of the TPS/PVA/SiO2 composites decreased significantly. The tensile strength, elongation at break, and Young's modulus of the TPS/PVA/SiO2 composites increased. The mechanical properties of the TPS/PVA/SiO2 composites containing treated SiO2 were higher than those with untreated SiO2. The thermal decomposition temperatures of the TPS/PVA/SiO2 composites were improved with the addition of SiO2. The presence of inorganic fillers was beneficial to the improvement of the thermal stability of the polymers. The reaction between the treated SiO2 and the starch molecules was beneficial to the formation of more stable structures. The treated SiO2 indicated good interfacial adhesion and uniform dispersion in the matrix. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44020.

Study of the behavior of biodegradable starch/polyvinyl alcohol/rosin blends

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Effect of Sorbitol Plasticizer on the Structure and Properties of Melt Processed Polyvinyl Alcohol Films

“…Nowadays, the fabrication of PVA based films or sheets were mainly based on solution casting methods (Briddick and others ; Hu and Wang ), which would cause low production efficiency, high energy consumption and environmental pollution. Therefore, the thermal processing of PVA has attracted great efforts of researchers and industry (Liu and others ; Guo and others ; Liu and others ; Wang and others ).…”

Thermoplastic starch and glutaraldehyde modified thermoplastic starch foams prepared using supercritical carbon dioxide fluid as a blowing agent

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“…As reported by several investigators, the extremely high diffusivity and low viscosity of scCO 2 can lead to effective plasticization of the amorphous regions of starch granules and favor water and glycerol penetration into the amorphous and/or crystalline regions of starch . This creates additional free volume in the starch and increases the mobility of the starch molecules, which is beneficial to the enhancement of the gelatinization and nucleation of the cell structure during the scCO 2 ‐assisted foaming. Disruption of hydrogen bonds, particularly disruption of those linking adjacent double helices within the original starch, become much easier with the aid of scCO 2 in gelatinization and foaming processes.…”