مشخصات پژوهش

In this work, the MSB system and equation of state was used for calculating the thermodynamics parameters like, solubility and diffusivity of different gases in polymer matrices. For determining the specific volume of polymers with blowing agents, the Sanchez-Lacombe (SL) equation of state was used which the chemical potential gradient of any gas was found from numerical calculation using the SL equation [1]. Fick’s second diffusion law was used for determining the diffusion coefficients [2]. The effect of different conditions on the solubility and diffusivity of blowing agents in the samples was examined. The results show that the solubility was increased by saturation pressure increment. Also it was disscused that the thermodynamics parameters were affected by the temperature increment. The diffusivity was increased with increasing of the pressure and temperature. The solubility data was corrected with the SL eqution and the diffusivity value was determined by fitting the Fick law equation on experimental data.