Abstract
Semicrystalline polymers are chemically/physically inhomogeneous, since they contain from as little as a fraction of a percent to even a few percent of non-polymeric substances (oligomers, antioxidants, processing agents) of different physicochemical properties, preferentially localized in non-crystalline regions. In this paper, the extraction process of non-polymeric substances with the use of supercritical CO2 for several semicrystalline polymers, such as polypropylene, high and low density polyethylene was performed. The quantitative/semi-qualitative analysis of extracted substances was performed and their thermal properties were determined. Then, their influence on the structure of amorphous phase-content and size of free volume pores were assessed. Finally, the influence of non-polymeric substances on thermal, thermo-mechanical and barrier properties of analyzed polymers and the course and intensity of the cavitation phenomenon during uniaxial stretching was determined.
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