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, cilt.52, sa.4, ss.1055-1062, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 52 Sayı: 4
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.polymer.2010.12.049
  • Dergi Adı: POLYMER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1055-1062
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

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.