Surface Modification of Poly-ε-Caprolactone with an Atmospheric Pressure Plasma Jet

Sarani, Abdollah; Jacobs, Tinneke; Nikiforov, Anton; Desmet, Tim; Dubruel, Peter

doi:10.1007/s11090-012-9419-3

Cited by 36 publications

(17 citation statements)

References 40 publications

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“…A typical voltage and current waveform of the plasma jet is given in Figure . Based on the obtained voltage–current waveforms, the average power W of the discharge is calculated according to the following equation (T = period of the discharge):

W = \frac{1}{T} \int_{t}^{t + T} I false(t false) V false(t false) dt

…”

Section: Methodsmentioning

confidence: 99%

Local Analysis of Pet Surface Functionalization by an Atmospheric Pressure Plasma Jet

Onyshchenko

Nikiforov

Morent

2015

Plasma Processes & Polymers

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In this work, space-resolved analysis of polyethylene terephthalate surface functionalization induced by an atmospheric pressure argon plasma jet has been conducted. In particular, the plasma jet footprint has been determined by examining radial water contact angle profiles. For the first time, space-resolved X-ray photoelectron measurements have also been carried out and have been correlated with the results of the water contact angle profiles. Different plasma treatment conditions, like discharge power, exposure time, sample distance and gas flow, have been varied to observe their effect on the plasma jet radial profiles. From this investigation, it has become clear that variations in exposure time and sample distance can strongly influence the radial hydrophilic region, while changes in gas flow rate and discharge power only result in small differences. Figure 4. Optical emission spectra at different distances from the center of the plasma jet on PET surface. Treatment parameters: distance between the bottom of the grounded electrode and sample -22 mm, power -4.0 W, gas flow -1 slm.

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W = \frac{1}{T} \int_{t}^{t + T} I false(t false) V false(t false) dt

…”

Section: Methodsmentioning

confidence: 99%

Local Analysis of Pet Surface Functionalization by an Atmospheric Pressure Plasma Jet

Onyshchenko

Nikiforov

Morent

2015

Plasma Processes & Polymers

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“…Recently, it has been shown that an atmospheric pressure plasma can be a viable method to increase the electrospinnability of a polymer solution [17][18] . Atmospheric pressure plasmas have been widely used to modify the surface of polymer materials including electrospun nanofibers because of their numerous advantages over traditional chemical modification processes [19][20] . However, research on the use of atmospheric pressure plasmas for polymer solution treatment is rarely performed.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Pressure Plasma Jet Treatment of Poly-ε-caprolactone Polymer Solutions To Improve Electrospinning

Grande

Guyse

Nikiforov

et al. 2017

ACS Appl. Mater. Interfaces

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An atmospheric pressure plasma jet (APPJ) specifically designed for liquid treatment has been used in this work to improve the electrospinnability of a 5 w/v % solution of poly-ε-caprolactone (PCL) in a mixture of chloroform and N,N-dimethylformamide. Untreated PCL solutions were found to result in nonuniform fibers containing a large number of beads, whereas plasma-treated solutions (exposure time of 2-5 min) enabled the generation of beadless, uniform nanofibers with an average diameter of 450 nm. This enhanced electrospinnability was found to be mainly due to the highly increased conductivity of the plasma-modified PCL solutions. Consequently, more stretching of the polymer jet occurred during electrospinning, leading to the generation of bead-free fibers. Plasma treatment also results in an increased viscosity and decreased pH values. To explain these observed changes, optical emission spectroscopy (OES) has been used to examine the excited species present in the APPJ in contact with the PCL solution. This study revealed that the peaks attributed to H, CH, CH, and C species could be responsible for the degradation of solvent molecules and/or PCL structures during the plasma treatment. Size exclusion chromatography and X-ray photoelectron spectroscopy results showed that the molecular weight and the chemical composition of PCL were not significantly affected by the APPJ treatment. Plasma exposure mainly results in the degradation of the solvent molecules instead of modifying the PCL macromolecules, preserving the original polymer as much as possible. A hypothesis for the observed macroscopic changes in viscosity and pH values could be the generation of new chemical species such as HCl and/or HNO. These species are characterized by their high conductivity, low pH values, and strong polarity and could enhance the solvent quality for PCL, leading to the expansion of the polymer coil, which could in turn explain the observed enhanced viscosity after plasma modification.

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“…The atmospheric pressure plasma treatment has been mainly applied for the sterilization of viruses or bacteria [18,19]. It has also been utilized for surface modification of heat-sensitive materials such as polymers, plastic films, and textiles [20,21]. Surface modification of carbon nanomaterials is being actively investigated.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric pressure plasma treatment on graphene grown by chemical vapor deposition

Lee

Cho²,

Jeong

2015

Current Applied Physics

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Surface Modification of Poly-ε-Caprolactone with an Atmospheric Pressure Plasma Jet

Cited by 36 publications

References 40 publications

Local Analysis of Pet Surface Functionalization by an Atmospheric Pressure Plasma Jet

Local Analysis of Pet Surface Functionalization by an Atmospheric Pressure Plasma Jet

Atmospheric Pressure Plasma Jet Treatment of Poly-ε-caprolactone Polymer Solutions To Improve Electrospinning

Atmospheric pressure plasma treatment on graphene grown by chemical vapor deposition

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