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Linear long alkyl chain substituted POSS cages : the effect of alkyl chain length on the self-assembled packing morphology
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Heeley, Ellen L., Hughes, Darren J., El Aziz, Youssef, Taylor, Peter G. 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, Volume 46 (Number 12). pp. 4944-4954. doi:10.1021/ma400635e ISSN 0024-9297 .
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Official URL: http://dx.doi.org/10.1021/ma400635e
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 Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Macromolecules | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0024-9297 | ||||
Official Date: | 25 June 2013 | ||||
Dates: |
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Volume: | Volume 46 | ||||
Number: | Number 12 | ||||
Page Range: | pp. 4944-4954 | ||||
DOI: | 10.1021/ma400635e | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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