Study of the molecular orientation in crystalline and amorphous fractions of polyethylene terephthalate fibres

Novak, I. I.; Suchkov, V. A.; Zosin, L. P.

doi:10.1016/0032-3950(69)90286-x

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…At higher draw ratios (DR > 5), the amorphous tie chain orientation continues, while crystalline orientation has saturated and amorphous orientation kinetics are dominant. Similar results have been reported in studies of melt-spun fibers of PP, − PA-6, and another polyester, PET . Based on these results, a schematic representation of the semicrystalline arrangement developed throughout the uniaxial drawing process in our coextruded PCL fibers was developed (Figure ).…”

Section: Resultssupporting

confidence: 83%

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Toward a Tunable Fibrous Scaffold: Structural Development during Uniaxial Drawing of Coextruded Poly(ε-caprolactone) Fibers

Jordan

Korley

2015

Macromolecules

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A continuous fibrous composite tape of poly-(ethylene oxide) (PEO) and poly(ε-caprolactone) (PCL) was produced using novel multilayer coextrusion fiber manufacturing. A three-step washing process was utilized to remove the PEO matrix, resulting in a PCL fiber mat (>99 wt %). Synchrotron X-ray radiation was utilized to determine the optimized postprocessing uniaxial drawing conditions to achieve efficient crystalline orientation. An examination of small-/wide-angle X-ray scattering (SAXS/WAXS) revealed two regimes in the uniaxial drawing process; at DR < 5, crystalline orientation kinetics were dominant, while at DR > 5, amorphous chain alignment kinetics were dominant. Uniaxial drawing was shown to be an effective tool for tuning individual fiber size from 2.6 ± 0.6 μm by 1.6 ± 0.4 μm in the as-extruded state to 0.31 ± 0.05 μm by 0.13 ± 0.02 μm in the oriented state, while increasing specific surface area 3.5-fold. The elastic modulus and tensile strength of the PCL fiber mat were also increased by a factor of 30 and ∼10, respectively, through uniaxial drawing. Compared to electrospun PCL fiber systems produced with individual fiber dimensions similar to those of the asextruded and oriented PCL fiber mats, the melt-processed PCL fibers exhibit a 6-fold increase in specific surface area over the corresponding circular, electrospun PCL fibers while maintaining similar thermomechanical properties. The elastic modulus of the oriented, coextruded PCL fiber mat was increased by a factor of 50 compared to the corresponding electrospun PCL fiber mat, while exhibiting a 2.5-fold increase in specific surface area. The ability to melt-process and utilize uniaxial drawing to produce PCL fibers in high volume with a consistent, tunable range of properties that are similar or enhanced when compared to traditional electrospun fibers provides a unique advantage in the field of tissue engineering, surface modification, and drug delivery.

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Section: Resultssupporting

confidence: 83%

“…Similar results have been reported in studies of melt-spun fibers of PP, 66−68 PA-6, 69 and another polyester, PET. 70 Based on these results, a schematic representation of the semicrystalline arrangement developed throughout the uniaxial drawing process in our coextruded PCL fibers was developed (Figure 8).…”

Section: = + ×mentioning

confidence: 99%

Toward a Tunable Fibrous Scaffold: Structural Development during Uniaxial Drawing of Coextruded Poly(ε-caprolactone) Fibers

Jordan

Korley

2015

Macromolecules

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Determining the angles between moments of vibratory transitions and the axis of the elementary polyethylene terephthalate unit

Stas’kov¹,

Gusev²

1976

Polymer Science U.S.S.R.

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Study of the molecular orientation in crystalline and amorphous fractions of polyethylene terephthalate fibres

Cited by 2 publications

References 2 publications

Toward a Tunable Fibrous Scaffold: Structural Development during Uniaxial Drawing of Coextruded Poly(ε-caprolactone) Fibers

Toward a Tunable Fibrous Scaffold: Structural Development during Uniaxial Drawing of Coextruded Poly(ε-caprolactone) Fibers

Determining the angles between moments of vibratory transitions and the axis of the elementary polyethylene terephthalate unit

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