EXPERIMENTAL AND THEORETICAL INVESTIGATION OF THE PORE FORMATION PROCESS IN GAS-FILLED POLYMERIC MATERIALS
DOI:
https://doi.org/10.15421/jchemtech.v29i2.222917Keywords:
gas-filled polymeric materials; porophore; bubbles; technological processing; pressure; temperature; mathematical model.Abstract
An analysis of experimental and theoretical studies of the process of pore formation in gas-filled polymeric materials has been carried out. Experimental studies by most authors have shown the dependences of the growth dynamics, morphology, and structure of bubbles in polymer melts, from which pores are formed in gas-filled polymer materials. It has been established that the process of bubble growth in polymer melts at a constant temperature proceeds almost indefinitely, which makes it possible to control the pore size in the resulting gas-filled polymer materials due to the time of their formation. It has been established that the size of bubbles in polymer melts increases with increasing temperature of melts, forming tools, and concentration of porophore and decreases with increasing pressure and melt viscosity. In theoretical studies, the main theories were reviewed to model and optimize the pore formation process in gas-filled polymer materials and to predict their properties, such as thermal conductivity and density. To analyze the behavior of bubbles in polymer melts (changes in the radius, bubble pressure), the optimal cylindrical coordinate system for this case was chosen. The Be Witte and Maxwell models were used to describe the process of pore formation in the gas-filled polymer materials. A mathematical model describing the dynamics of bubble growth in polymer melts for a two-layer system has been proposed.
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