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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.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1039/C5RA03267A
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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.

Item Type: Journal Item
Copyright Holders: 2015 The Royal Society of Chemistry
ISSN: 2046-2069
Keywords: polyhedral oligomeric silsesquioxanes POSS; polymer nanocomposites; X-ray scattering; morphology; crystallization
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Other Departments > Vice-Chancellor's Office
Other Departments
Interdisciplinary Research Centre: Biomedical Research Network (BRN)
Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 42522
Depositing User: Ellen Heeley
Date Deposited: 15 Apr 2015 09:27
Last Modified: 04 Sep 2017 09:11
URI: http://oro.open.ac.uk/id/eprint/42522
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