Nanoscale thin film ordering produced by channel formation in the inclusion complex of α-cyclodextrin with a polyurethane composed of polyethylene oxide and hexamethylene

Hasan, Erol A., Cosgrove, Terence and Round, Andrew N. ORCID: https://orcid.org/0000-0001-9026-0620 (2008) Nanoscale thin film ordering produced by channel formation in the inclusion complex of α-cyclodextrin with a polyurethane composed of polyethylene oxide and hexamethylene. Macromolecules, 41 (4). pp. 1393-1400.

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Abstract

A polyurethane consisting of six blocks of polyethylene glycol and five blocks of hexamethylene diisocyanate was synthesized. The influence of the addition of a-cyclodextrin (a-CyD) on the lower critical solution temperature behavior of the polyurethane was investigated by “cloud point” measurements, and the dependence of the phase state (solution, suspension, and gel) of a-CyD/polyurethane mixtures on the concentration of the two components was determined. The results suggest that the polyurethane forms inclusion complexes with a-CyD and that close to the maximum number of a-CyDs was included. The associative constant of the a-CyD/polyurethane inclusion complex was determined by 1H NMR shift titration using a modified Benesi-Hildebrand equation, and the complex was characterized in the solid state by 13C cross polarization/magic angle spinning NMR and X-ray diffraction. These studies showed that the complexes adopted a channel-like structure. Finally, the morphology of a-CyD/polyurethane complexes in the solid state was visualized by scanning electron microscopy and atomic force microscopy (AFM). AFM images of the inclusion complexes spun-cast on to silicon reveal the existence of ordered domains with heights commensurate with the existence of tetra- and higher-order a-CyD channels. The height quanta of these well-ordered, discrete plateaus point to the dominating influence of the size of the polyethylene glycol blocks within the polyurethane and suggest a route to the production of controlled subnanometer structured surfaces.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Pharmacy (former - to 2024)
UEA Research Groups:	Faculty of Science > Research Groups > Drug Delivery and Pharmaceutical Materials (former - to 2017)
Depositing User:	Rachel Smith
Date Deposited:	05 Apr 2011 11:10
Last Modified:	24 Sep 2024 09:29
URI:	https://ueaeprints.uea.ac.uk/id/eprint/28046
DOI:	10.1021/ma071484n

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