Abstract
The complex issue of shear-induced nucleation and crystallization, especially in the composites or in presence of nucleating agents, is still not sufficiently understood. Due to growing interest of application of inorganic and organic hybrids in plastics technology and processing, analysis of that phenomenon seems reasonable. This work investigated the crystallization of isotactic polypropylene homopolymer in the presence of three modifiers: ZrO2∙SiO2, ZrO2 SiO2 modified with lanthanum and calcined ZrO2 ∙SiO2 modified with lanthanum. The investigations were performed using WAXS technique, DSC analysis and PLM observations. The PLM analysis were prepared with use of hot-shear stage Linkam CSS 450, allowing for in situ observations of crystals growth in the dynamic conditions. Results indicated that pristine, amorphous ZrO2 ∙SiO2 acts as a nucleating agent for isotactic polypropylene. Proposed explanation was based on the correlation between heteronucleation and surface properties. Moreover, the oriented flow of hybrid powders may induce the formation of row nuclei in appropriate conditions. The occurrence of row nuclei results in formation of fibrilar crystallites. Moreover, the shear flow affects not only on morphology, but also on the crystallization kinetics.
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The authors would like to thank Mr. Jacob Halajczak.
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This work was funded by the Polish Ministry of Education and Science.
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Bednarek, W.H., Ciesielczyk, F., Odalanowska, M. et al. Crystallization process in the isotactic polypropylene melts with ZrO2∙SiO2 hybrids in quiescent and dynamic conditions. J Polym Res 29, 171 (2022). https://doi.org/10.1007/s10965-022-03015-4
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DOI: https://doi.org/10.1007/s10965-022-03015-4