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The Influence of the Molecular Structure of Used Polyolefins on Selected Properties of Foams

The Master's thesis is composed of a literature review describing a formation of a porous structure, processing technologies of the foam production, materials suitable for a foam preparation and application possibilities of the foamed products. This study was focused, with the respect to the main motivation, on the preparation of foam structures with desired physical properties, by using environmental-friendly materials. Therefore, the influence of molecular structure of used polyolefins, on the selected properties of prepared foams was studied simultaneously with regard to gain proper characteristics determining required quality of final foams. An experimental part was performed in order to prepare foam samples of a low-density polyethylene with addition of linear low-density polyethylene of defined molecular structure in different ratios, whereas the properties have been kept in accordance to application in thermal insulation. Further, investigation of the properties and morphology of prepared foams was carried out by utilization of differential scanning calorimetry and scanning electron microscopy, which have proven profitability of linear low-density polyethylene addition, providing suitable structure for bubble formation, growth and stabilization. An attention was also given to important factor of viscoelastic behaviour of foams, determined by dynamic mechanical analysis.

This paper highlights application of the C-Therm TCi Thermal Conductivity Analyzer.

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