Superstructure and mechanical properties of poly(L-lactic acid) microfibers prepared by CO2 laser-thinning

Suzuki, Akihiro; Mizuochi, Daisuke; Hasegawa, Toshinori

doi:10.1016/j.polymer.2005.04.047

Cited by 13 publications

(7 citation statements)

References 26 publications

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“…It is difficult to draw and anneal only a microfiber obtained, since its diameter and its tensile strength are too small, but the microfibers in a bundle could be drawn and annealed by a zone‐heating. The microfiber bundle was made by winding on a spool without a traverse in the CO 2 laser‐thinning apparatus described previously 10. To zone‐draw and zone‐anneal the microfiber bundle, an apparatus was specially constructed as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

“…The CO 2 laser‐thinning method easily yields microfibers without using highly skilled techniques, and it is suitable for producing microfibers of various polymers at a small scale. The CO 2 laser‐thinning method was previously applied to poly(ethylene terephthalate) (PET),5, 6 nylon 6,7 nylon 66,8 isotactic polypropylene,9 and poly( L ‐lactic acid) (PLLA),10 and then their microfibers with a diameter of about 2 μm were obtained. SEM showed that the laser‐thinned (LT) microfibers had smooth surfaces not roughened by laser ablation, which were uniform in diameter.…”

Section: Introductionmentioning

confidence: 99%

“…Although the CO 2 laser‐thinning was characterized by the plastic flow accompanied by a molecular orientation and a strain‐induced crystallization, the mechanical properties of the obtained microfiber were insufficient because of the lack of the highly oriented amorphous chains and crystallites 5–10. Therefore, it was necessary to draw and anneal the microfiber obtained to improve its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO₂ laser‐thinning method

Suzuki

Mizuochi

2006

J of Applied Polymer Sci

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A zone-drawing and zone-annealing method was applied to the poly(l-lactic acid) (PLLA) microfiber obtained by using a carbon dioxide (CO 2 ) laser-thinning to develop its mechanical properties. The microfiber used for the zone-drawing and zone-annealing was prepared by winding at 800 m min Ϫ1 the microfiber that was obtained by irradiating the laser at 8.0 W cm Ϫ2 to an as-spun fiber supplied at a speed of 0.5 m min Ϫ1 and had a diameter of 1.5 m and a birefringence of 20.3 ϫ 10 Ϫ3 . The zone-drawing was carried out at a drawing temperature of 85°C under an applied tension of 150 MPa, and the zone-annealing at an annealing temperature of 110°C under 181 MPa. The zonedrawing and the zone-annealing were carried out at a treating speed of 0.1 m min Ϫ1 . The diameter of microfiber decreased, and its birefringence increased stepwise with processing. The zone-annealed microfiber finally obtained had a diameter of 1.2 m, a birefringence of 43.3 ϫ 10 Ϫ3 , a tensile modulus of 14.0 GPa, and a tensile strength of 1.5 GPa. The wide-angle X-ray diffraction pattern of the zone-annealed microfiber showed the existence of the highly oriented crystallites.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO₂ laser‐thinning method

Suzuki

Mizuochi

2006

J of Applied Polymer Sci

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“…It is obvious that a 4% PLLA solution allowed for a better crystalline index, which is clearly interesting for biomedical applications, as it has a significant impact on both degradation rate 37 and mechanical properties. 38 Table III presents DMA results. It can be noted that the storage modulus at 37 was slightly higher for the PLLA film than for the PLLA nanofiber mesh.…”

Section: Plla Nanofiber Deposition and Characterizationmentioning

confidence: 99%

Characterization of an air‐spun poly(L‐lactic acid) nanofiber mesh

et al. 2010

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It was previously showed that PLLA nanofiber mesh promoted good endothelial cell proliferation. A new technique was developed to produce nanofibers by air jet spinning inside the tubular shape of vascular prostheses and to characterize this nanofiber mesh. Polymer macromolecule stability was assessed by gel permeation chromatography. Thermal analyses were conducted with differential scanning calorimetry and dynamic mechanical analysis on PLLA nanofibers obtained with 4% and 7% solutions (w/v) in chloroform. Polyethylene terephthalate (PET) was also treated with atmospheric pressure dielectric barrier discharge under air or nitrogen atmosphere to optimize PLLA nanofiber adherence, assessed by peel tests. Air spinning induced a reduction of number-average molecular weight (M(n)) for the 7% PLLA solution but not for the 4% solution. The nanofibers were more crystalline and less sensible to viscoelastic relaxation as a function of aging in the 4% solution than in the 7% solution. Discharge treatment of the PET promoted identical surface modification on PET film and PET textile surfaces. Moreover, the best PLLA nanofibers adhesion results were obtained under nitrogen atmosphere. This study demonstrates that it is possible to coat the internal side of tubular vascular prostheses with PLLA nanofibers, and provides a better understanding of the air spinning process as well as optimizing nanofibers adhesion.

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“…A carbon dioxide (CO 2 ) laser‐thinning method developed by us could easily produce microfibers by irradiating a continuous‐wave CO 2 laser to fibers, such as poly(ethylene terephthalate) (PET),16 nylon 6,17 nylon 66,18 i‐polypropylene,19 poly( L ‐lactic acid) (PLLA),20, 21 and poly(ethylene ‐2,6‐ naphthalate) (PEN)22 fibers without highly skilled techniques. The microfiber obtained by winding on a spool in the winding speed range of 100–2500 m min −1 was monofilament microfiber with a uniform diameter.…”

Section: Introductionmentioning

confidence: 99%

Poly(ethylene‐2,6‐naphthalate) nanofiber prepared by carbon dioxide laser supersonic drawing

Suzuki

Yamada

2010

J of Applied Polymer Sci

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Poly(ethylene-2,6-naphthalate) (PEN) nanofiber was prepared by a carbon dioxide (CO 2 ) laser supersonic drawing. The CO 2 laser supersonic drawing was carried out by irradiating the laser to the as-spun PEN fiber in a low-temperature supersonic jet. The supersonic jet was generated by blowing off air into a vacuum chamber from a fiber supplying orifice. The flow velocity from the orifice can be estimated by applying Graham's theorem from the pressure difference between the atmospheric pressure and the pressure of the vacuum chamber. The fastest flow velocity estimated was 396 m s À1 (Mach 1.15) at a chamber pressure of 6 KPa. The nanofiber obtained at Mach 1.15 was the oriented nanofibers with an average diameter of 0.259 lm, and its draw ratio estimated from the diameters before and after the drawing reached 430,822 times. The CO 2 laser supersonic drawing is a new method to make nanofiber without using any solvent or removing the second component.

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Superstructure and mechanical properties of poly(L-lactic acid) microfibers prepared by CO2 laser-thinning

Cited by 13 publications

References 26 publications

Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO₂ laser‐thinning method

Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO₂ laser‐thinning method

Characterization of an air‐spun poly(L‐lactic acid) nanofiber mesh

Poly(ethylene‐2,6‐naphthalate) nanofiber prepared by carbon dioxide laser supersonic drawing

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Superstructure and mechanical properties of poly(L-lactic acid) microfibers prepared by CO2 laser-thinning

Cited by 13 publications

References 26 publications

Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO2 laser‐thinning method

Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO2 laser‐thinning method

Characterization of an air‐spun poly(L‐lactic acid) nanofiber mesh

Poly(ethylene‐2,6‐naphthalate) nanofiber prepared by carbon dioxide laser supersonic drawing

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Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO₂ laser‐thinning method

Zone‐drawing and zone‐annealing of poly(L‐lactic acid) microfiber prepared by CO₂ laser‐thinning method