Brill transition of nylon-6 in electrospun nanofibers

详细信息    查看全文

• 作者：Chi Wang (1)
  Shih-Yung Tsou (1)
  Hsuan-Sheng Lin (1)
  
• 关键词：Electrospinning ; Nylon ; 6 ; Brill transition ; Melting
• 刊名：Colloid & Polymer Science
• 出版年：2012
• 出版时间：November 2012
• 年：2012
• 卷：290
• 期：17
• 页码：1799-1809
• 全文大小：801KB
• 参考文献：1. Murthy NS (2006) Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides. J Polym Sci Polym Phys 44:1763 CrossRef
  2. Liu X, Wu Q (2002) Phase transition in nylon 6/clay nanocomposites on annealing. Polymer 43:1933 CrossRef
  3. Ramesh C, Gowd EB (2001) High-temperature X-ray diffraction studies on the crystalline transitions in the alpha- and gamma-forms of nylon-6. Macromolecules 34:3308 CrossRef
  4. Murthy NS, Curran SA, Aharoni SM, Minor H (1991) Premelting crystalline relaxations and phase-transitions in nylon-6 and 6,6. Macromolecules 24:3215 CrossRef
  5. Vasanthan N, Murthy NS, Bray RG (1998) Investigation of Brill transition in nylon 6 and nylon 6,6 by infrared spectroscopy. Macromolecules 31:8433 CrossRef
  6. Fong H, Liu W, Wang CS, Vaia RA (2002) Generation of electrospun fibers of nylon 6 and nylon 6-montmorillonite nanocomposite. Polymer 43:775 CrossRef
  7. Dersch R, Liu T, Schaper AK, Greiner A, Wendoref JH (2003) Electrospun nanofibers: internal structure and intrinsic orientation. J Polym Sci Polym Chem 41:545 CrossRef
  8. Lee KH, Kim KW, Pesapane A, Kim HY, Rabolt JF (2008) Polarized FT-IR study of macroscopically oriented electrospun nylon-6 nanofibers. Macromolecules 41:1494 CrossRef
  9. Liu Y, Cui L, Guan F, Gao Y, Hedin NE, Zhu L, Fong H (2007) Crystalline morphology and polymorphic phase transitions in electrospun nylon-6 nanofibers. Macromolecules 40:6283 CrossRef
  10. Giller CB, Chase DB, Rabolt JF, Snively CM (2010) Effect of solvent evaporation rate on the crystalline state of electrospun nylon 6. Polymer 51:4225 CrossRef
  11. Tsou SY, Lin HS, Wang C (2011) Studies on the electrospun nylon 6 nanofibers from polyelectrolyte solutions: 1. Effects of solution concentration and temperature. Polymer 52:3127 CrossRef
  12. Todoki M, Kawaguchi T (1977) Melting of constrained drawn nylon-6 yarns. J Polym Sci Polym Phys 15:1507
  13. Kojima Y, Matsuoka T, Takahashi H, Kurauchi T (1994) Crystallization of nylon 6–clay hybrid by annealing under elevated pressures. J Appl Polym Sci 51:683 CrossRef
  14. Medellin-Rodriguez FJ, Burger C, Hsiao BS, Chu B, Vaia R, Phillips S (2001) Time-resolved shear behavior of end-tethered nylon 6–clay nanocomposites followed by non-isothermal crystallization. Polymer 42:9015 CrossRef
  15. Liu TX, Liu ZH, Ma KX, Shen L, Zeng KY, He CB (2003) Morphology, thermal and mechanical behavior of polyamide 6/layered-silicate nanocomposites. Compo Sci Technol 63:331 CrossRef
  16. Winberg P, Eldrup M, Pedersen NJ, van Es MA, Maurer FHJ (2005) Free volume sizes in intercalated polyamide 6/clay nanocomposites. Polymer 46:8239 CrossRef
  17. Yu J, Tonpheng B, Andersson O (2010) High-pressure-induced microstructural evolution and enhancement of thermal properties of nylon-6. Macromolecules 43:10512 CrossRef
  18. Jeng US, Su CH, Su CJ, Liao KF, Chuang WT, Lai YH, Chang JW, Chen UJ, Huang YS, Lee MT, Yu KL, Lin JM, Liu DG, Chang CF, Liu CY, Chang CH, Liang KS (2010) A small/wide-angle X-ray scattering instrument for structural characterization of air–liquid interfaces, thin films and bulk specimens. J Appl Cryst 43:110 CrossRef
  19. McKee MG, Wilkes GL, Colby RH, Long TE (2004) Correlations of solution rheology with electrospun fiber formation of linear and branched polyesters. Macromolecules 37:1760 CrossRef
  20. Shenoy SL, Bates WD, Frisch HL, Wnek GE (2005) Role of chain entanglements on fiber formation during electrospinning of polymer solutions: good solvent, non-specific polymer-polymer interaction limit. Polymer 46:3372 CrossRef
  21. McKee MG, Hunley MT, Layman JM, Long TE (2006) Solution rheological behavior and electrospinning of cationic polyelectrolytes. Macromolecules 39:575 CrossRef
  22. Wunderlich B (1973) Macromolecular physics, vol 1. Academic, New York, p 389
  23. Ibanes C, de Boissieu M, David L, Seguela R (2006) High temperature behaviour of the crystalline phases in unfilled and clay-filled nylon 6 fibers. Polymer 47:5071 CrossRef
  24. Murthy NS, Wang ZG, Hsiao BS (1999) Interactions between crystalline and amorphous domains in semicrystalline polymers: small-angle X-ray scattering studies of the Brill transition in nylon 6,6. Macromolecules 32:5594 CrossRef
  25. Ramesh C, Keller A, Eltink SJEA (1994) Studies on the crystallization and melting of nylon-6,6. 1. The dependence of the Brill transition on the crystallization temperature. Polymer 35:2483 CrossRef
  26. Yang X, Tan S, Li G, Zhou E (2001) Dependence of the Brill transition on the crystal size of nylon 10 10. Macromolecules 34:5936 CrossRef
  27. Tosaka M, Yamaguchi K, Tsuji M (2010) Latent orientation in the skin layer of electrospun isotactic polystyrene ultrafine fibers. Polymer 51:547 CrossRef
  28. Czaputa K, Brenn G, Meile W (2008) Concentration profiles in drying cylindrical filaments. Heat Mass Transf 45:227 CrossRef
  29. Sano Y (2001) Dry behavior of acetate filament in dry spinning. Drying Technol 19:1335 CrossRef
  30. Koombhongse S, Liu W, Reneker DH (2001) Flat polymer ribbons and other shapes by electrospinning. J Polym Sci Polym Phys 39:2598 CrossRef
  
• 作者单位：Chi Wang (1)
  Shih-Yung Tsou (1)
  Hsuan-Sheng Lin (1)
  
  1. Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan
  
• ISSN：1435-1536

文摘

Electrospun nylon-6 fibers were prepared from its polyelectrolyte solution in formic acid with different concentrtaions. In situ Fourier transform infrared (FTIR), wide-angle X-ray diffraction and small-angle X-ray scattering (SAXS) were performed on the nylon-6 fibers heated to various temperatures until melting. For comparison, stepwise annealing of the solution-cast film having exclusively the α-form was also carried out to elucidate the structural evolution. Our results showed that Brill transition in the electrospun fibers occurs at a lower temperature than that in the solution-cast film due to the crystal size difference. Differential scanning calorimetry heating traces on the as-spun fibers exhibited a unique crystalline phase with a melting temperature of ?35?°C, higher than the equilibrium melting temperature of nylon-6. The content of high melting temperature (HMT) phase increased with increasing nylon-6 concentration; a maximum of 30?% of the fiber crystallinity was reached for fibers obtained from the 22?wt.% solution regardless of the heating rates used. Based on the SAXS and FTIR results, we speculated that the HMT phase is associated with thick α-form crystals developed from the highly oriented nylon-6 chains that are preserved in the skin layer of the as-spun fibers. A plausible mechanism for the formation of the skin/core fiber morphology during electrospinning was proposed.