Degradation properties of PLA and PHBV films treated with CO2-plasma

Kim, Myung Chan; Masuoka, Toshio

doi:10.1016/j.reactfunctpolym.2009.01.013

Cited by 45 publications

(30 citation statements)

References 25 publications

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“…The surface of the front side of the fabric before treatment showed a slightly wrinkled texture (Figure 6a), with ripples that gave way to small pits after plasma treatment with a direct incidence of oxygen (Figure 6c). A similar result was observed by Kim and Masuoka (2009) 4 when they performed the plasma treatment of PLA, using CO 2 as the working gas, they attributed this phenomenon to several factors such as attack, the bombardment of ions, radicals or UV irradiation of the plasma. According to these authors, the presence of pits can increase the surface reactivity of the fibers, resulting in a higher rate of degradation of this polymer.…”

Section: Resultssupporting

confidence: 75%

“…The O/C ratio it was increased by the plasma treatment, where can be observed a tendency to follow the proportion of CH 4 :O 2 inserted in the reactor. It was observed, for instance, that after treatment in a proportion 2:3 the O/C changed from 0.15 to 0.60 on the side facing the O 2 inlet (front) and to 0.48 on the side facing CH 4 input (back).…”

Section: Measurement Of Water Absorption Ratementioning

confidence: 86%

“…Thus, the fluid penetrates into the fabric through the hydrophilic side being ejected from the hydrophobic side, causing the fabric to act as a pump. In addition, it was evaluated the influence of the proportion of gases CH 4 :O 2 , where three settings were applied, 3:2, 1:1 and 2:3.…”

Section: Methodsmentioning

confidence: 99%

“…The authors suggested that active species generated during the action of the plasma remained on the surface of the material and reacted with oxygen in the air after treatment, forming polar groups. Garcia et al (2008) 13 when studying plasma treatment of PP in an atmosphere of CH 4 :O 2 (8:2), also identified an increase in the O/C ratio, of 0.04 for 0.13 after 60 s treatment. According to these authors, the use of plasma containing an organic monomer such as methane is known as plasma polymerization, resulting in the deposition of organic material on the substrate.…”

Section: Measurement Of Water Absorption Ratementioning

confidence: 95%

“…For example, a PLA implant is degraded with a reduction in weight of 63.2% within 168 days and it is estimated that complete degradation occurs in one and a half year or more 2,3 . When PLA is used as suture threads, during the decomposition process will become more hydrophilic, increasing absorption of water, thus accelerating the degradation, despite this degradation time may take from days to years depending upon the formulation and the molecular weight 2,4 . Tissue engineering has also made use of this polymer as threedimensional porous structures, technically called "scaffold" which aims to allow the entry, adhesion and proliferation of regenerative cells.…”

Section: Introductionmentioning

confidence: 99%

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Controlling Wettability of the Each Side of the PLA Fabric through Orientation of the Working Gases (O2 and CH4) During Cold Plasma Treatment

et al. 2017

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This study aimed to obtain a bifunctional fabric from the point of view of hydrophilicity/ hydrophobicity for biomedical applications. To achieve this, both sides of a fabric of polylactic acid (PLA) were subjected to a plasma treatment. While in a side the oxygen was introduced to the other side, simultaneously, was added methane. The plasma treatment was performed at 100 W, 1.8 mbar, during 30 minutes. By Scanning Electron Microscopy (SEM) morphological analysis, it became evident that the fabric side facing the oxygen inlet showed micropittings, while the reverse side had smooth surfaces. Analysis by X-Ray photoelectron spectroscopy (XPS) revealed an increase in the amount of oxygen in the surface of the PLA on both sides of the fabric. The surface function was characterized by measurements of water absorption rate, where it was determined that one fabric side was more hydrophilic than the other side. The results indicated achievement of a bifunctional fabric through orientation of working gases during a plasma treatment.

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Section: Resultssupporting

confidence: 75%

Section: Measurement Of Water Absorption Ratementioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Measurement Of Water Absorption Ratementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Controlling Wettability of the Each Side of the PLA Fabric through Orientation of the Working Gases (O2 and CH4) During Cold Plasma Treatment

et al. 2017

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Surface modification of PHBV films with different functional groups: Thermal properties and in vitro degradation

Wang

et al. 2010

J of Applied Polymer Sci

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Polyacrylamide was photografted on solution-cast poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) films (amide-PHBV), on which amide groups were transformed into amine groups through Hofmann degradation reaction (amine-PHBV), followed by collagen coupling reaction to prepare collagen-modified PHBV (collagen-PHBV). Amide-, amine-, and collagen-PHBV had higher water absorption and d-spacing values than PHBV, and melting temperatures and enthalpies decreased in the order of collagen-PHBV < amine-PHBV < amide-PHBV < PHBV. Thermal decomposition kinetics of PHBV component in the films has been investigated by means of nonisothermal thermogravimetric and derivative thermogravimetric studies. Applying the Avrami-Erofeev equation with index of 2/5 as the probable kinetic function, the suitable activation energy was calculated by the Friedman method through linear fitting (correlation coefficient > 0.98). The activation energy of PHBV was lower than that of amide-PHBV but higher than that of amine-and collagen-PHBV. Being incubated in phosphate-buffered saline at 37 C, the modified PHBV films showed more weight loss than PHBV during 360 days; however, pH of degradation fluids was nearly neutral as the initial pH was recorded at 7.2. The modified PHBV films with different functional groups may provide an improved biodegradation rate for various cytocompatible biomaterials constructs.

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Plasma surface modification of porous PLLA films: Analysis of surface properties and in vitro hydrolytic degradation

Mattioli

Kenny

Armentano

2012

J of Applied Polymer Sci

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The aim of this research was to investigate the effects of plasma treatment on the surface and on the in vitro degradation behavior of poly(L‐lactide) (PLLA) films. Polymer films were prepared by solvent casting, and their surface was modified by radiofrequency plasma treatments by using oxygen and tetrafluorocarbon gas. Pristine and treated PLLA films were characterized by field emission and atomic force microscopy and by contact angle measurements. In vitro hydrolytic degradation studies were conducted by measurements of weight loss, water absorption, visual inspection, and thermal transitions as a function of the incubation time. As‐deposited PLLA films show a uniform distribution of ring‐like porous structures on the surface due to solvent evaporation. Plasma treatments produce a mass reduction following the etching of the polymer surface. Moreover, the morphology of the porous polymer is modified by the plasma, which induces different micro/nanometric topographic reliefs as a function of the different selected plasma processing parameters. The results indicate PLLA surface become hydrophilic and the surface roughness increased with treatment time in the case of oxygen, whereas a hydrophobic behavior was induced with tetrafluorocarbon plasma treatment. However, in vitro degradation studies show that plasma treatments do not affect the PLLA bulk and the hydrolytic degradation properties. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Degradation properties of PLA and PHBV films treated with CO2-plasma

Cited by 45 publications

References 25 publications

Controlling Wettability of the Each Side of the PLA Fabric through Orientation of the Working Gases (O2 and CH4) During Cold Plasma Treatment

Controlling Wettability of the Each Side of the PLA Fabric through Orientation of the Working Gases (O2 and CH4) During Cold Plasma Treatment

Surface modification of PHBV films with different functional groups: Thermal properties and in vitro degradation

Plasma surface modification of porous PLLA films: Analysis of surface properties and in vitro hydrolytic degradation

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