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http://dx.doi.org/10.5762/KAIS.2018.19.6.21

Study on the rheological, thermal and mechanical properties of thermoplastic starch plasticized by glycerol  

Bui, Duc Nhat (Division of Advanced Materials Science and Engineering, College of Engineering, Kongju National University)
Son, Younggon (Division of Advanced Materials Science and Engineering, College of Engineering, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.6, 2018 , pp. 21-26 More about this Journal
Abstract
Thermoplastic starch (TPS) was prepared by mixing starch with glycerol as a plasticizer. The glycerol content ranged from 20 to 35 wt. % and TPS was prepared in a twin screw extruder. The shear viscosity, thermal and mechanical properties of the TPS were investigated. The viscosity of TPS exhibited typical shear thinning behavior: decreasing viscosity with increasing shear rate. The power index, n, increased with increasing glycerol content. This is because as the content of glycerol, a Newtonian fluid, increases, the viscosity behavior of the TPS becomes closer to that of a Newtonian fluid. The thermal behavior of TPS showed that starch and glycerol are miscible. In addition, when TPS was aged for more than one day at room temperature, TPS showed a partially miscible phase structure. The moisture absorbed into the TPS was assumed to change the phase behavior. The mechanical properties of TPS were found to be strongly dependent on the content of the plasticizer. Both the toughness and stiffness increased with increasing plasticizer content. DSC showed that this unusual result was due to the combined effect of humidity and the high amylose content in starch.
Keywords
thermoplastic starch; glycerol; viscosity; green materials; thermal processing;
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