gas-filled polymers, pore formers, phenylon, foam plastics, thermophysical and physico-mechanical properties


Heat-resistant gas-filled polymer-based composites with inorganic pore formers were developed in the work. Aromatic polyamide phenylon, which is one of the heat-resistant and strongest polymers, was chosen as the polymer base. To reduce the viscosity of its melt during processing, PMS-500 oligosiloxane liquid was introduced into the products. It was established that the optimal content of this modifier is 2 % by mass. At this content of oligosiloxane liquid, the lowest values of polymer composite melt viscosity are observed during processing into products. To create a gas-filled composition, the following pore formers were studied: ammonium chloride (NH4Cl), magnesium carbonate (MgCO3), and polyvinyl alcohol (PVA). As a result of their thermogravimetric analysis, it was established that the most suitable pore former for aromatic polyamide is MgCO3, the decomposition products of which are able not only to create pores in the polymer, but also to thermostabilize it, which is proven by the increase in the Vicat softening temperature values of the obtained polymer composite materials. А study of the thermophysical characteristics of the developed foams based on phenylon, namely the apparent density, heat capacity, and thermal conductivity. It was established that their values are at the level of the best analogues. Based on the fact that in values of strength (up to 6 MPa) and maximum operating temperature (up to 557 K), the developed foams based on phenylon significantly exceed the best analogues, they can be recommended for use as foams operating at a significant level of loads and temperatures.


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