Nanocomposites and nanomaterials

State equation and thermodynamic functions of polyvinylchloride filled with nanodispersed metals
Levchuk V.V.1, Kolupaev B.B.2, Kolupaev B.S.1, Maksymtsev Yu.R.1, Sidletskyi V.O.1, Lyashuk T.G.1
1 2Rivne State University of Humanities 31 Plastova ., Rivne 33028, Ukraine
E-mail: Levchuk_VV@ukr.net
2 Institute of Cybernetics of the Rivne International Economic and Humanitarian University named after Academician S. Demyanchuk, 4 S. Demianchuk, Rivne 33028, Ukraine

The results of studies on the viscoelastic properties of polyvinyl chloride (PVC) filled with nano-dispersed powder of copper (Cu), nickel (NiCr) together with data of calorimetric measurements were used to obtain the equation of state and thermodynamic functions of a composite. The main relations are the result of the dependence of the thermal capacity (Cp) of the PVC-systems on temperature (T) for a certain value of pressure (p0); density ()  (0, Т); isothermal compressibility () (р0, Т). The results of the behavior of composites for longitudinal (l, E, αl), volumetric (K) and displacement deformation (t, µ, αt) at a frequency of 0.4 MHz have allowed to find the value of  and to carry out the transition from adiabatic to isothermal conditions material handling at different types of deformation. The calculated values of the corresponding values at zero pressure and their first derivatives are calculated. From the condition that in the region of the glasses state  is a linear function of , φ we obtain the relations (with an accuracy of ≤ 1.0%) for changes in the value of the modulus of elasticity for p, which corresponds to  ½  (р, Т).
Investigation of the thermophysical properties of PVC + Cu (NiCr) systems was carried out in the range 298 K ≤ T 355 K, which showed that there is a quantitative relationship between , , і (і=l, t) and Cp,  (thermal conductivity coefficient) , and the internal pressure (pV) is determined by the volume density of the internal energy as a result of the inter- intra-molecular interaction forces. For each pair of parameters (p, V, T, S) the thermodynamic potentials change depending on the content of nanodispersed metals. The ratios used are used for the analysis of deformation of PVC systems in the ultrasonic frequency range. The results are compared with theoretical calculations and the area of practical use of composites is determined