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Crystalline Morphology and Polymorphic Phase Transitions in Electrospun Nylon-6 Nanofibers
Open accessAbstract
Uniform nylon 6 nanofibers with diameters around 200 nm were prepared by electrospinning. Polymorphic phase transitions and crystal orientation of nylon 6 in unconfined (i.e., as-electrospun) and a high T(g) (340 degrees C) polyimide confined nanofibers were studied. Similar to melt-spun nylon 6 fibers, electrospun nylon 6 nanofibers also exhibited predominant, meta-stable gamma crystalline form, and the gamma-crystal (chain) axes preferentially oriented parallel to the fiber axis. Upon annealing above 150 degrees C, gamma-form crystals gradually melted and recrystallized into the thermodynamically stable alpha-form crystals, which ultimately melted at 220 degrees C. Release of surface tension accompanied this melt-recrystallization process, as revealed by differential scanning calorimetry. For confined nanofibers, both the melt-recrystallization and surface tension release processes were substantially depressed; gamma-form crystals did not melt and recrystallize into alpha-form crystals until 210 degrees C, only 10 degrees C below the T(m) at 220 degrees C. After complete melting of nano-confined crystals at 240 degrees C and recrystallization at 100 degrees C, only alpha-form crystals oriented perpendicular to the nanofiber axis were obtained. In the polyimide-confined nanofibers, the Brill transition (from the monoclinic alpha-form to a high temperature monoclinic form) was observed at 180-190 degrees C, which was at least 20 degrees C higher than that in unconfined nylon 6 at approximately 160 degrees C. This, again, was attributed to the confinement effect.
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Cited by
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Ghosal, K., Agatemor, C., Špitálsky, Z., Thomas, S., & Kny, E. (2019) · Chemical Engineering Journal · doi:10.1016/j.cej.2018.10.117 · Cited by 278
Polymorphic Behavior of Syndiotactic Polystyrene Crystallized in Cylindrical Nanopores
Wu, H., Wang, W., Huang, Y., Wang, C., & Su, Z. (2008) · Macromolecules · doi:10.1021/ma801498b · Cited by 52
Zhong, G., Wang, K., Zhang, L., Li, Z.-M., Fong, H., & Zhu, L. (2011) · Polymer · doi:10.1016/j.polymer.2011.09.045 · Cited by 50
Self-citationControllable micro cross-linking towards multifunctional flame-retardant aliphatic polyamide
Zhang, Q., Zhu, G.-R., Xiao, X.-X., Liu, Q.-S., Jiang, M., Guo, D.-M., Zhao, H.-B., Li, W.-D., Chen, L., Liu, B.-W., et al. (2023) · Chemical Engineering Journal · doi:10.1016/j.cej.2023.144983 · Cited by 37
Metadata
- Authors
- Liu, Y., Cui, L., Guan, F., Gao, Y., Hedin, N. E., Zhu, L., & Fong, H.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-07-27
- Volume
- 40
- Issue
- 17
- Pages
- 6283-6290
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2004327188
- Cited by
- 236
- References
- 0
- FWCI
- 9.01
- Type
- journal article
- Language
- en
- Open access
- green
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- Liu, Y., Cui, L., Guan, F., Gao, Y., Hedin, N. E., Zhu, L., & Fong, H. (2007). Crystalline Morphology and Polymorphic Phase Transitions in Electrospun Nylon-6 Nanofibers. Macromolecules. https://doi.org/10.1021/ma070039p
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