Polypropylene Filled with Silica Modified by Organosilanes with Different Lengths of Alkyl Chain

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F24%3A63579980" target="_blank" >RIV/70883521:28110/24:63579980 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Polypropylene Filled with Silica Modified by Organosilanes with Different Lengths of Alkyl Chain

Popis výsledku v původním jazyce

This study investigates the production, modification, and application of silica (SiO2) particles to enhance the properties of polypropylene (PP) composites. The modification of SiO2 was achieved using various organosilanes, specifically methyltriethoxysilane (C1), propyltriethoxysilane (C3), octyltriehoxysilane (C8), and octadecyltriethoxysilane (C18). The Stöber process facilitated the synthesis of silica particles, and subsequent modification with the alkoxysilanes was confirmed using thermogravimetric analysis (TGA). The PP-SiO2 composites were prepared by melt-mixing process of PP with 0.2 wt. % SiO2. Isothermal crystallization studies revealed that the presence of SiO2, particularly the unmodified variant, significantly influences the crystallization rate of PP. The shortest crystallization half-time (t0.5) was generally observed in PP-SiO2 across various crystallization temperatures, except for PP-SiO2-C1, which exhibited the slowest crystallization. The results suggested that the alkyl chain length of the organosilanes did not consistently affect t0.5. Melting analysis indicated negligible β-phase formation in neat PP and PP-SiO2, regardless of crystallization temperature. However, organophilized mixtures (PP-SiO2-C1, C3, C8, and C18) showed increased β-phase content with decreasing crystallization temperature. Above this threshold, the materials predominantly crystallized into the α-phase, similar to neat PP and PP-SiO2. The nucleation effect, and hence the β-phase formation, was attributed to the presence of organosilane-modified SiO2 particles. This study demonstrates that organophilized silica particles can induce β-phase formation in isotactic polypropylene, with the alkyl chain length of the organosilanes playing a critical role. The β-phase onset was observed at crystallization temperatures below 134 °C, highlighting the potential of organosilane-modified SiO2 in tailoring the crystallization behaviour and phase composition of polypropylene composites.

Název v anglickém jazyce

Polypropylene Filled with Silica Modified by Organosilanes with Different Lengths of Alkyl Chain

Popis výsledku anglicky

This study investigates the production, modification, and application of silica (SiO2) particles to enhance the properties of polypropylene (PP) composites. The modification of SiO2 was achieved using various organosilanes, specifically methyltriethoxysilane (C1), propyltriethoxysilane (C3), octyltriehoxysilane (C8), and octadecyltriethoxysilane (C18). The Stöber process facilitated the synthesis of silica particles, and subsequent modification with the alkoxysilanes was confirmed using thermogravimetric analysis (TGA). The PP-SiO2 composites were prepared by melt-mixing process of PP with 0.2 wt. % SiO2. Isothermal crystallization studies revealed that the presence of SiO2, particularly the unmodified variant, significantly influences the crystallization rate of PP. The shortest crystallization half-time (t0.5) was generally observed in PP-SiO2 across various crystallization temperatures, except for PP-SiO2-C1, which exhibited the slowest crystallization. The results suggested that the alkyl chain length of the organosilanes did not consistently affect t0.5. Melting analysis indicated negligible β-phase formation in neat PP and PP-SiO2, regardless of crystallization temperature. However, organophilized mixtures (PP-SiO2-C1, C3, C8, and C18) showed increased β-phase content with decreasing crystallization temperature. Above this threshold, the materials predominantly crystallized into the α-phase, similar to neat PP and PP-SiO2. The nucleation effect, and hence the β-phase formation, was attributed to the presence of organosilane-modified SiO2 particles. This study demonstrates that organophilized silica particles can induce β-phase formation in isotactic polypropylene, with the alkyl chain length of the organosilanes playing a critical role. The β-phase onset was observed at crystallization temperatures below 134 °C, highlighting the potential of organosilane-modified SiO2 in tailoring the crystallization behaviour and phase composition of polypropylene composites.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10404 - Polymer science

Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů