Abstract
Polyrotaxane (PR), a typical example of topological supramolecular architecture,consists of multiple cyclic molecules threaded onto a linear polymer backboneand capped with bulky end-groups. The PR system of polyethylene glycol andα-cyclodextrin(α-CD) has been extensively studied for its facile synthesis, unique molecular structure,and possible applications for various smart materials. We have previouslydemonstrated the fabrication of PR-based fibers without chemical cross-links by wetspinning of PR solution. In this paper, we investigate the crystal structure ofα-CDs in PR fibers and the effect of drawing on it. Theα-CDs in PR fiber are found to form hexagonal channel-type structure.The drawing process promotes formation of the packing arrangement ofα-CDs in thec-axis because ofthe sliding of α-CD molecules along the polymer backbone. In addition, we demonstrate the preparation ofan elastomeric PR film having similar network structure to the fibers and ethylene glycololigomer as plasticizer.
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