The results of studying the effect of clinoptilolite concentration on the properties of nanocomposites based on of ethylene with butylene and of ethylene with hexene copolymer are presented. The effect of clinoptilolite particle size on ultimate tensile stress, elongation at break, flexural modulus, heat resistance, and melt flow index of composites was studied. It is shown that nanocomposites based on ethylene copolymers are characterized by higher values of physicomechanical properties. The additional use of ingredients such as alizarin and calcium stearate contributes to a significant improvement in the complex of properties of nanocomposites based on ethylene copolymers and clinoptilolite
The results of a study of the influence of temperature and shear stress on the rheological properties of ethylene/hexene copolymer and its clinoptilolite-filled nanocomposites are presented. Rheological measurements were carried out in the temperature range of 190-250 0 C. The dependence of shear rate on shear stress, effective melt viscosity on shear rate, and melt viscosity on temperature in Arrhenius coordinates is studied. Using the universal temperature-invariant viscosity characteristics of nanocomposites allows to make approximate calculations of effective viscosity close to the conditions of their processing by extrusion and injection molding by extrapolation to the region of high shear rates.
In the paper the results of the study of the influence of clinoptilolite concentration, shear stress and temperature on the effective viscosity, shear rate and activation energy of the viscous flow of nanocomposites based on linear low-density polyethylene were presented. It was shown that the in the composition of the natural mineral contains kaolinite or nanoclay. During the diffusion of macro chains into the interlayer space of nanoclays, the latter decays and the surfactant, exchanged cations or anions, stearates present there, as a result migrate into the polymer matrix and then, as lubricants, improve the flowability of the melt of the nanocomposite. For the first time it was shown that natural minerals of Azerbaijan belong to the number of bifunctional fillers, which contribute to the enhancement of polymer composites and, at the same time, improve the flowability of their melt. Rheological studies were carried out on the MELT FLOW TESTER, CEAST MF50 (INSTRON, Italy) capillary rheometer in the temperature range of 190-250 °C and the load of 2.16 -21.6 kg. The size of the nanoparticles of the composites was determined using the device model of STA PT1600 Linseiz, Germany, which varied from 14 to 110 nm. The nanoparticles of clinoptilolite were obtained in the analytical mill A-11 at the maximum rotor speed of 28,000 rpm. Flow curves of nanocomposites based on linear low density polyethylene and clinoptilolite were determined. It was established that introduction of 5% wt. clinoptilolite promotes an increase in shear rate 2.62 times. The results of the study of the influence of clinoptilolite concentration on the rheological and physico-mechanical characteristics of nanocomposites were presented. It was shown that when the concentration of clinoptilolite in the polymer matrix increases from 5 to 15 wt% the shear rate is somewhat reduced, but remains higher than that of the initial polyolefin.For citation:Kakhramanov N.T., Koseva N.S., Kurbanova R.V., Bayramova I.V., Arzumanova N.B., Ismailzade A.C. Rheological characteristics of nanocomposites based on clinoptilolite and linear polyethylene of low density. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 7. P. 105-112
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