IMPROVEMENT OF PRODUCTION TECHNOLOGY FOR THERMOPLASTIC COMPOUNDS INTENDED FOR THE PRODUCTION OF BIODEGRADABLE POLYMER MATERIALS
Ilya Vasilyev,
Ilona Chernaya,
Elena Orlova
Abstract: The article presents the preparation and study of the properties of thermoplastic compounds based on a new glycerol/monoglyceride plasticizing system instead of the traditionally used glycerol/sorbitol in mixtures with native starch (corn, pea, rice) to obtain biodegradable polymer compositions. By mixing starch/glycerin/monoglyceride and starch/glycerin/sorbitol alternately, they were processed in a Mash-Plast laboratory twin-screw extruder (Russia) and produced thermoplastic compounds in the form of round-section strands and granules. When using a new plasticizing system based on glycerin/monoglyceride instead of the traditionally used glycerin/sorbitol in the process of manufacturing thermoplastic compounds in mixtures with starch of various origins (corn, pea, rice) during extrusion, a more homogeneous monolithic structure is formed, which has an effect on increasing the strength properties by two times compared to the use of a glycerin/sorbitol plasticizing system, in which the formation of a more defective structure with a phase boundary between the starch-sorbitol components was observed. When determining the thermophysical properties and supramolecular structure of thermoplastic compounds, it was established that starch is characterized by different proportions of amylose and amylopectin, which affects the temperature of their processing with sorbitol and monoglyceride plasticizers. It has been shown that the conversion of native starch into a thermoplastic state using a new plasticizing system with monoglyceride, as in the case of sorbitol, is accompanied by a change in the phase state, resulting in the decrystallization of the initial starch, which affects the production of homogeneous composite melts with the possibility of their processing by extrusion.
Keywords: Starch, Glycerin, Sorbitol, Monoglyceride, Extrusion, Structure, Thermoplastic compounds, Thermoplastic starch
DOI: 10.24874/PES08.02B.006
Recieved: Revised: Accepted:
UDC:
Reads: 5 
