Melt-crystallized nylon-6 nucleated by the constrained chains of its non-stoichiometric cyclodextrin inclusion compounds and the nylon-6 coalesced from them


Mohan A., Gurarslan A. , Joyner X., Child R., Tonelli A. E.

POLYMER, vol.52, no.4, pp.1055-1062, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 52 Issue: 4
  • Publication Date: 2011
  • Doi Number: 10.1016/j.polymer.2010.12.049
  • Title of Journal : POLYMER
  • Page Numbers: pp.1055-1062

Abstract

Non-covalently bonded crystalline inclusion compounds (ICs) have been formed by threading host cyclic starches, cyclodextrins (CDs), onto guest nylon-6 (N-6) chains. When excess N-6 is employed, non-stoichiometric (n-s)-N-6-CD-ICs, with partially uncovered and "dangling" N-6 chains, result. While the host crystalline CD lattice is stable to similar to 300 degrees C, the uncovered, yet constrained, portions of the N-6 chains emanating from the CD-IC surfaces may crystallize below, or be molten above 225 C, and confer upon them shape-memory. When heated between the T-m of N-6 and the decomposition temperature of the (n-s)-N-6-CD-IC, they may be deformed into a new shape, which is retained following a rapid quench below T-m. When this newly-shaped sample is heated above the T-m of the un-included and crystalline portions of N-6, it reverts back to its original shape in response to the constraining CD-IC crystals.