Effect of annealing on the crystallization and properties of electrospun polylatic acid and nylon 6 fibers

Ah Ra Cho; Dong Myeong Shin; Hyun Wook Jung; Jae Chun Hyun; Joo Sung Lee; Daehwan Cho; Yong Lak Joo

doi:10.1002/app.33262

Effect of annealing on the crystallization and properties of electrospun polylatic acid and nylon 6 fibers

Ah Ra Cho, Dong Myeong Shin, Hyun Wook Jung, Jae Chun Hyun, Joo Sung Lee, Daehwan Cho, Yong Lak Joo

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article

24 Citations (Scopus)

Abstract

Electrospinning experiments for solutions of two polymers with different crystallization rates, polylatic acid (PLA), and nylon 6 solutions have been carried out. Hexafluoroisopropanol (HFIP) was used as a common solvent to dissolve both PLA and nylon 6. Using the fact that nylon 6 has the faster crystallization rate than PLA, the effect of thermal annealing conditions on the crystal structures of two electrospun fibers has mainly been studied via thermal and mechanical analysis. First, optimal conditions for the formation of uniform nanofibers have been determined by observing their morphology and rheological properties. Thermal analysis revealed that PLA as-spun fiber exhibits cold crystallization due to insufficient crystal growth in spinline. Also, the effect of thermal annealing on the structural change of nylon 6 fibers including the degree of flow-induced crystallization is totally different from that of PLA fibers. Finally, tensile measurements of annealed fibers show that the ultimate tensile strength and Young's modulus gradually increases with increasing annealing time for both PLA and nylon 6 mats, resulting from the further growth of crystal structures.

Original language	English
Pages (from-to)	752-758
Number of pages	7
Journal	Journal of Applied Polymer Science
Volume	120
Issue number	2
DOIs	https://doi.org/10.1002/app.33262
Publication status	Published - 2011 Apr 15

Keywords

PLA
annealing
crystal structure
mechanical properties
nylon 6
solution electrospinning
thermal properties

ASJC Scopus subject areas

Chemistry(all)
Surfaces, Coatings and Films
Polymers and Plastics
Materials Chemistry

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Cho, A. R., Shin, D. M., Jung, H. W., Hyun, J. C., Lee, J. S., Cho, D., & Joo, Y. L. (2011). Effect of annealing on the crystallization and properties of electrospun polylatic acid and nylon 6 fibers. Journal of Applied Polymer Science, 120(2), 752-758. https://doi.org/10.1002/app.33262

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abstract = "Electrospinning experiments for solutions of two polymers with different crystallization rates, polylatic acid (PLA), and nylon 6 solutions have been carried out. Hexafluoroisopropanol (HFIP) was used as a common solvent to dissolve both PLA and nylon 6. Using the fact that nylon 6 has the faster crystallization rate than PLA, the effect of thermal annealing conditions on the crystal structures of two electrospun fibers has mainly been studied via thermal and mechanical analysis. First, optimal conditions for the formation of uniform nanofibers have been determined by observing their morphology and rheological properties. Thermal analysis revealed that PLA as-spun fiber exhibits cold crystallization due to insufficient crystal growth in spinline. Also, the effect of thermal annealing on the structural change of nylon 6 fibers including the degree of flow-induced crystallization is totally different from that of PLA fibers. Finally, tensile measurements of annealed fibers show that the ultimate tensile strength and Young's modulus gradually increases with increasing annealing time for both PLA and nylon 6 mats, resulting from the further growth of crystal structures.",

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AU - Cho, Ah Ra

AU - Shin, Dong Myeong

AU - Jung, Hyun Wook

AU - Hyun, Jae Chun

AU - Lee, Joo Sung

AU - Cho, Daehwan

AU - Joo, Yong Lak

PY - 2011/4/15

Y1 - 2011/4/15

N2 - Electrospinning experiments for solutions of two polymers with different crystallization rates, polylatic acid (PLA), and nylon 6 solutions have been carried out. Hexafluoroisopropanol (HFIP) was used as a common solvent to dissolve both PLA and nylon 6. Using the fact that nylon 6 has the faster crystallization rate than PLA, the effect of thermal annealing conditions on the crystal structures of two electrospun fibers has mainly been studied via thermal and mechanical analysis. First, optimal conditions for the formation of uniform nanofibers have been determined by observing their morphology and rheological properties. Thermal analysis revealed that PLA as-spun fiber exhibits cold crystallization due to insufficient crystal growth in spinline. Also, the effect of thermal annealing on the structural change of nylon 6 fibers including the degree of flow-induced crystallization is totally different from that of PLA fibers. Finally, tensile measurements of annealed fibers show that the ultimate tensile strength and Young's modulus gradually increases with increasing annealing time for both PLA and nylon 6 mats, resulting from the further growth of crystal structures.

AB - Electrospinning experiments for solutions of two polymers with different crystallization rates, polylatic acid (PLA), and nylon 6 solutions have been carried out. Hexafluoroisopropanol (HFIP) was used as a common solvent to dissolve both PLA and nylon 6. Using the fact that nylon 6 has the faster crystallization rate than PLA, the effect of thermal annealing conditions on the crystal structures of two electrospun fibers has mainly been studied via thermal and mechanical analysis. First, optimal conditions for the formation of uniform nanofibers have been determined by observing their morphology and rheological properties. Thermal analysis revealed that PLA as-spun fiber exhibits cold crystallization due to insufficient crystal growth in spinline. Also, the effect of thermal annealing on the structural change of nylon 6 fibers including the degree of flow-induced crystallization is totally different from that of PLA fibers. Finally, tensile measurements of annealed fibers show that the ultimate tensile strength and Young's modulus gradually increases with increasing annealing time for both PLA and nylon 6 mats, resulting from the further growth of crystal structures.

KW - PLA

KW - annealing

KW - crystal structure

KW - mechanical properties

KW - nylon 6

KW - solution electrospinning

KW - thermal properties

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