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Linear Long Alkyl Chain Substituted POSS Cages: The Effect of Alkyl Chain Length on the Self-Assembled Packing Morphology

DOI: 10.1021/ma400635e DOI Help

Authors: Ellen Heeley (The Open University) , Darren Hughes (University of Warwick) , Youssef El Aziz (Open University) , Peter Taylor (Open University) , Alan R. Bassindale (Open University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Macromolecules

State: Published (Approved)
Published: June 2013
Diamond Proposal Number(s): 6719

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.

Subject Areas: Materials

Instruments: I22-Small angle scattering & Diffraction

Other Facilities: ESRF DUBBLE

Added On: 16/06/2013 09:36

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