STRESS–STRAIN CHARACTERISTICS OF ISOTACTIC POLYPROPYLENE J-170T AND BLOCK - COPOLYMER PROPYLENE WITH JM-370 ETHYLENE, DEPENDING ON TEMPERATURE AND EXTRUSION NUMBER
Q. N. BerdinazarovUzbekistan Academy of Sciences, Institute of Polymer Chemistry and PhysicsN. F. NormurodovUzbekistan Academy of Sciences, Institute of Polymer Chemistry and PhysicsE. O. KhakberdievUzbekistan Academy of Sciences, Institute of Polymer Chemistry and PhysicsSh. G. SadykovUzbekistan Academy of Sciences, Institute of Polymer Chemistry and PhysicsN. R. AshurovUzbekistan Academy of Sciences, Institute of Polymer Chemistry and PhysicsA. A. RiskulovTashkent Institute for the Design, Construction and maintence of automobile Roads
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Аннотация
Polypropylene (PP), thanks to the physicist-mechanical and temperature characteristics, are widely used in mechanical engineering and the electrical industry. In the process of thermal exposure due to degradation of PP macromolecules, a loss of elastic strength characteristics is observed. It was shown that the influence of extrusion temperatures (170-200 0С) and extrusion numbers (up to 7 cycles) lead to a strengthening of a number of mechanical properties for isotactic PP (J-170T) and practically do not affect the block copolymer of propylene with ethylene. The data obtained are of interest for the selection of polypropylene recycling conditions.
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