Femtosecond laser ablation of polypropylene for breathable film

Sohn, Ik-Bu; Noh, Young‐Chul; Choi, Sungchul; Ko, Do‐Kyeong; Lee, Jongmin; Choi, Youngjin

doi:10.1016/j.apsusc.2008.01.166

Cited by 38 publications

(39 citation statements)

References 13 publications

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“…26 Recent application of femtolaser is in microfabrication of micro-electro-mechanical systems (MEMS) devices based on polymer, glass, 27 silicon wafer, 28 and dielectric materials such as soda-lime glass and fused quartz. 29 In tissue engineering application, femtosecond laser was reported in generating surface modification on polymer thin films such as poly(glycolic acid), 30 polypropylene, 31 and poly(ecaprolactone). 30,32 Creating microchannels directly on a biodegradable polymer scaffold using femtosecond laser has not been reported till date.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Topological Guidance for Cell Alignment via Direct Laser Writing on Biodegradable Polymer

Yeong

Lim

et al. 2010

Tissue Engineering Part C: Methods

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Direct laser writing on biodegradable polymer to create microchannels for aligning cells is presented here. This technique offers the advantages of ease-of-manufacturing, ease-of-design, high-speed single-step fabrication, and noncontacting to the material. In this work, microchannels of 100 microm width, 100 microm depth, and 50 microm intervals were created on a biodegradable polymer film directly using a Ti-sapphire femtosecond pulsed laser. Multiscale topological features were achieved as a result of the laser beam-material interaction. These topological features were used to guide cell alignment in the microchannels. We present results on the morphology of poly(L-lactide-co-epsilon-caprolactone) copolymer micromachined by femtosecond laser and demonstrate the attachment and alignment of C2C12 myoblast cells in the microchannels. C2C12 cells exhibited favorable attachment in the channels after 1 day of seeding. High degree of alignment was observed after 4 days as cells proliferated into a confluent patch inside the channels. This work demonstrated the potential of wavy surface features combined with appropriate channel size for high-density cell alignment using direct laser writing. This method also offers the opportunity to incorporate multiscale topological guidance on other biodegradable polymer implants, such as vascular scaffolds and stents, which require directed cell organization.

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Section: Introductionmentioning

confidence: 99%

Multiscale Topological Guidance for Cell Alignment via Direct Laser Writing on Biodegradable Polymer

Yeong

Lim

et al. 2010

Tissue Engineering Part C: Methods

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“…Microperforation is one of the techniques for increasing the gas transmission rate of packaging films. The O 2 , CO 2 , and ethylene gases can flow in and out of the packaging through the microholes, by which the undesirably low level of O 2 and high level of CO 2 in the package headspace can be avoided …”

Section: Introductionmentioning

confidence: 99%

Effect of biaxial‐simultaneous stretching conditions on OTR and CO₂ permeation of CO₂ laser perforated poly(lactic acid) film

et al. 2018

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The biaxially oriented poly(lactic acid) films prepared using simultaneous biaxial stretching were perforated by CO2 laser with the power of 60 W. The focal spot diameter was fixed at 103 μm. Pulse durations were varied from 1 to 30 μs, which corresponds to the fluence from 1.4 to 42.6 J/cm2. The perforated microhole size increased with increasing laser energy. The shape of microholes was circular for the films of equi‐biaxial stretching, whereas elliptical microholes were formed with its long and short axes corresponding to the directions of higher and lower stretch ratios, respectively. Comparing the laser perforation behavior of the as‐drawn films and annealed films, the opening of a microhole in the annealed films started at higher laser fluence, and at the same fluence the size of microhole was smaller. Gas transmission rates of the biaxially oriented poly(lactic acid) films with different thicknesses were examined. The oxygen transmission rates (OTR) of film improved with increased microhole diameter. The OTR of films containing 1 microhole/103 cm2 (hole diameter of ~110 μm) was 184, 150, and 98 cm3/d in comparison with the OTR for the original films without microhole of only 16, 10, and 8 cm3/d, respectively. Packaging films with OTR higher than 100 cm3/d (equivalent to the 9700 cm3/m2/d) are required to create a modified atmosphere inside the package of fresh produce for shelf‐life extension. Measured OTR and CO2TR values of the 3 different shapes of microhole were compared and discussed.

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“…[6] Recent applications of femtolaser are found in the microfabrication of microelectromechanical systems devices based on glass, [7] silicon wafers [8] and dielectric materials. [9] Femtosecond lasers have also been reported for use in surface ablation and surface modification of thin polymer films, [10][11][12] as well as carbon fiber polymer composites. [13] Tiaw et al utilized a femtolaser to drill holes of 25-80 mm diameter through ultrathin poly(e-caprolactone) (PCL) membranes of 10-15 mm thickness.…”

mentioning

confidence: 99%

“…In another thin film application, Sohn et al ablated polypropylene film of 30 mm thickness to fabricate precise microperforated packaging films. [11] They reported the dimension of perforation with respect to different pulse energy and pulse frequency. In another study, PCL and poly(glycolic acid) (PGA) were micro-patterned using a Ti-sapphire femtosecond pulsed laser.…”

mentioning

confidence: 99%

Annealing of Biodegradable Polymer Induced by Femtosecond Laser Micromachining

Yeong¹,

Lim²,

et al. 2010

Adv Eng Mater

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Femtosecond laser is a potential tool for net shape processing of biodegradable polymers. However, laser processing of polymeric material is still a challenge and the effects induced by laser ablation needs to be investigated. Poly(ε‐caprolactone) was micromachined at high fluence and the heat affected zone was characterized. Two different phases of microstructure, namely the annealed spherulite zone and the amorphous zone, are found.

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Femtosecond laser ablation of polypropylene for breathable film

Cited by 38 publications

References 13 publications

Multiscale Topological Guidance for Cell Alignment via Direct Laser Writing on Biodegradable Polymer

Multiscale Topological Guidance for Cell Alignment via Direct Laser Writing on Biodegradable Polymer

Effect of biaxial‐simultaneous stretching conditions on OTR and CO₂ permeation of CO₂ laser perforated poly(lactic acid) film

Annealing of Biodegradable Polymer Induced by Femtosecond Laser Micromachining

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Femtosecond laser ablation of polypropylene for breathable film

Cited by 38 publications

References 13 publications

Multiscale Topological Guidance for Cell Alignment via Direct Laser Writing on Biodegradable Polymer

Multiscale Topological Guidance for Cell Alignment via Direct Laser Writing on Biodegradable Polymer

Effect of biaxial‐simultaneous stretching conditions on OTR and CO2 permeation of CO2 laser perforated poly(lactic acid) film

Annealing of Biodegradable Polymer Induced by Femtosecond Laser Micromachining

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Effect of biaxial‐simultaneous stretching conditions on OTR and CO₂ permeation of CO₂ laser perforated poly(lactic acid) film