Issue 44, 2015

Crystallization and morphology development in polyethylene–octakis(n-octadecyldimethylsiloxy)octasilsesquioxane nanocomposite blends

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 the 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.

Graphical abstract: Crystallization and morphology development in polyethylene–octakis(n-octadecyldimethylsiloxy)octasilsesquioxane nanocomposite blends

Article information

Article type
Paper
Submitted
21 Feb 2015
Accepted
07 Apr 2015
First published
08 Apr 2015
This article is Open Access
Creative Commons BY license

RSC Adv., 2015,5, 34709-34719

Crystallization and morphology development in polyethylene–octakis(n-octadecyldimethylsiloxy)octasilsesquioxane nanocomposite blends

E. L. Heeley, D. J. Hughes, P. G. Taylor and A. R. Bassindale, RSC Adv., 2015, 5, 34709 DOI: 10.1039/C5RA03267A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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