Features of some Polymer Building Materials Behavior at Heating

Abstract

The problems of reducing combustibility and increasing fire resistance of some polymer building materials are considered. And the toxicity of the gaseous products of their thermal degradation was evaluated both individually and in various combinations with each other. The features of thermal degradation and the loss of mechanical properties under the influence of a flame of polymer building materials were studied. The following samples were used: water pipes based on polyethylene; Tarkett linoleum, Ondex roofing products, Rolvaplast PVC profile panels; structural panels of the company "Polygal"; facing tile based on phenol-formaldehyde oligomers. The processes occurring during pyrolysis and combustion are considered, the results of a study of the combustibility and mechanical properties of polymer building materials based on polyethylene, polyvinyl chloride, polycarbonate, phenol-formaldehyde and epoxy oligomers under the influence of a flame are presented. For the studied building polymer materials, the products of pyrolysis and combustion were studied; their ignition and self-ignition temperatures, and also the flame propagation velocity were measured. The data on the toxicity of the products of their combustion, both individually and under combined action, are summarized. Also, for the studied polymer building materials, the losses of heat resistance, toughness, and flexural strength under the influence of a flame were studied. Thermogravimetric analysis of Rolvaplast PVC panels and Poligal polycarbonate panels allowed us to determine the maximum temperatures and activation energies of the polymer decomposition process. It was concluded that if the material is recognized as non-combustible or slow-burning, it will not always be fire resistant, since its strength and thermal properties can sharply decrease already in the first seconds of flame exposure.

Influence of Nature of Pigments and Dyes on Coloring Properties of Polymeric Superconcentrates

“…To select the optimal composition used a generalized desirability function, which is a unique, unique and universal indicator of the quality of polymeric materials, which allows taking into account the degree of weight of a finished product and the requirements of consumer industries [16].…”

“…Data for soot brands P803 and N220 are shown in tables 4, 5 and figures 1-6. Tests of physical and mechanical properties were performed according to the method [16].…”

Computer Simulation Modeling of an Inhomogeneous Medium with Ellipse-Shaped Irregular Elements

“…The works [32] highlight the large-scale nature in the field of modelling. Spherical elements (balls) are mainly modelled for inhomogeneous media, which provides a narrow level of abstraction for numerical modelling using irregular and ellipsoid elements [33,34]. From the material described above, it follows that the development of a computer simulation model for the study of an inhomogeneous environment, as well as the process of simulating elements of ellipsoid and irregular shapes is an urgent task.…”

Investigation of the Main Stages in Modeling Spherical Particles of Inhomogeneous Materials

“…According to the structure of these materials they are very diverse [26], and the properties of these materials are different [27]. So, the approach to the problem of mathematical modeling of structure needs to differentiate each group of structurally heterogeneous materials based on their properties and basic methods of learning [28] which is a form of reflection of reality [29].…”