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Linear long alkyl chain substituted POSS cages: the effect of alkyl chain length on the self-assembled packing morphology

Heeley, Ellen L.; Hughes, Darren J.; El Aziz, Youssef; Taylor, Peter and Bassindale, Alan R. (2013). Linear long alkyl chain substituted POSS cages: the effect of alkyl chain length on the self-assembled packing morphology. Macromolecules, 46(12) pp. 4944–4954.

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URL: http://pubs.acs.org/doi/abs/10.1021/ma400635e
DOI (Digital Object Identifier) Link: https://doi.org/10.1021/ma400635e
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Abstract

The self-assembled long-range ordering, packing morphology and thermal behavior of a series of polyhedral oligomeric silsesquioxanes (POSS) T8 cage systems with long n-alkyl chain pendant groups is presented. State-of-the-art time-resolved small- and wide-angle X-ray scattering (SAXS/WAXS), thermal and optical techniques were used to elucidate their morphology. X-ray scattering showed long-range crystalline ordering where the alkyl chains align in an axial disposition from the POSS core giving a “rod-like” self-assembled packing morphology with a length-scale correlating to the overall molecular dimensions. Phase transitions observed by thermal methods were comparable to those seen in the crystallization of bulk n-alkanes. Optical measurements and crystallization kinetics confirmed a lamellar macromorphology again being similar to the crystal structure of bulk n-alkanes. This study reveals for the first time, the direct effect that the alkyl chain length has on the self-assembled crystalline packing morphology of this novel and potentially commercially relevant, series of POSS systems.

Item Type: Journal Item
Copyright Holders: 2013 American Chemical Society
ISSN: 1520-5835
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
Item ID: 37805
Depositing User: Ellen Heeley
Date Deposited: 18 Jun 2013 08:20
Last Modified: 07 Dec 2018 11:59
URI: http://oro.open.ac.uk/id/eprint/37805
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