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Physical Properties of Polymers Handbook · Polyrotaxanes

Abstract

This chapter discusses structures, properties and major applications of polyrotaxanes. The polyrotaxanes can be made by two different methods: statistical threading or via the template approach (enthalpically driven). A main chain polyrotaxane, a mechanically interlocked structure that can be considered as a string of pearls, in which the strand is the polymer backbone and the pearls are the cyclic species threaded onto the strand. Because of the formation of the mechanically interlocked structure, polyrotaxanes have different physical properties, such as solubility, thermostability, photoelectronic properties, viscosity, and phase behavior, compared with simple reference (nonpolyrotaxanated) polymers. Usually the solubilities of polyrotaxanes are very different from their components. Because of the hydrophilic, high polarity nature of the exterior of the cyclodextrins (CDs), many CD-based polypseudorotaxanes and polyrotaxanes are soluble in water and some polar solvents though their parent polymers are hydrophobic or nonpolar. Two polyrotaxane systems are presented: 1) polyurethane-based polyrotaxanes and 2) polyester-based polyrotaxanes. Polyurethane-based polyrotaxanes were investigated because polyurethanes are glassy polymers and incorporation of crystalline crown ethers allows for crystalline domains to form from the crown ethers upon annealing, similar to the block copolymers derived from glassy and crystalline components. Polyesters are highly crystalline and typically do not exhibit glass transitions; however, polyester-based polyrotaxanes show Tg's, dual melting transitions due to two crystalline phases, the polyester and the crown ether, and reduced melt viscosities when compared to control polyesters of similar molecular weights.

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About this content

Title
Physical Properties of Polymers Handbook · Polyrotaxanes
Book Title
Physical Properties of Polymers Handbook
Book DOI
10.1007/978-0-387-69002-5
Chapter DOI
10.1007/978-0-387-69002-5_43
Part of
Volume
Editors
  • James E. Mark Send Email (1)
  • Editor Affiliation
  • 1 Department of Chemistry, University of Cincinnati, Crosley Tower, Martin Luther King Drive, 45221-0172, Cincinnati, OH
  • Authors
  • Feihe Huang Send Email (2)
  • Adam M.-P. Pederson Send Email (3)
  • Harry W. Gibson Send Email (4)
  • Author Affiliation
  • 2 Department of Chemistry, Virginia Polytechnic & State University, 24061, Blacksburg, VA
  • 3 Department of Chemistry, Virginia Polytechnic & State University, 24061, Blacksburg, VA
  • 4 Department of Chemistry, Virginia Polytechnic & State University, 24061, Blacksburg, VA
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