Crystallization and morphology development in polyethylene-octakis(n-octadecyldimethylsiloxy)octasilsesquioxane nancomposite blends.

Heeley, E. L.; Hughes, D. J.; Taylor, P. G. and Bassindale, A. R. (2015). Crystallization and morphology development in polyethylene-octakis(n-octadecyldimethylsiloxy)octasilsesquioxane nancomposite blends. RSC Advances, 5(44) pp. 34709–34719.

DOI: https://doi.org/10.1039/C5RA03267A

Abstract

The dispersion, morphology and crystallization kinetics of low density polyethylene (LDPE) - octakis(n-octadecyldimethylsiloxy)octasilsesquioxane (POSS) nanocomposite blends was investigated. Novel octakis(dimethylsiloxy)octasilsesquioxane (Q8M8H) molecules were octafunctionalised with octadecyl alkyl-chains (Q8C18) and blended with 0.25-10 wt% loadings into a commercial LDPE. Time-resolved Small- and Wide-Angle X-Ray scattering (SAXS/WAXS), thermal and microscopy techniques were used to elucidate the POSS dispersal, crystalline morphology and crystallization kinetics of the host polymer. POSS particles dispersed well in the host polymer up to 5% wt loading and acted as nucleating agents without disrupting the crystal lattice of PE. Above 5% wt loading the POSS aggregated, reduced the bulk crystallinity and hindered the crystallization process. The aggregation of POSS is attributed to increased POSS-POSS interactions whereby the POSS molecules self-assemble in an interdigitated manner. The results were compared with an analogous LDPE-T8C18 POSS cage blend at 10%wt loading. In complete contrast, the T8 POSS particles disperse well in the host polymer being effective nucleating agents and increased the bulk crystallinity. This may have important implications in the processing of polyolefins where the T8 system acts to accelerate crystallization whereas the Q8 system retards it.

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About

• Item ORO ID
• 42522
• Item Type
• Journal Item
• ISSN
• 2046-2069
• Keywords
• polyhedral oligomeric silsesquioxanes POSS; polymer nanocomposites; X-ray scattering; morphology; crystallization
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Research Group
• Chemistry and Materials Research Group
• Copyright Holders
• © 2015 The Royal Society of Chemistry
• Depositing User
• Ellen Heeley