Surface Modification of Polymeric Materials by Plasma Treatment

Vidaurre, Elza F. Castro; Achete, Carlos A.; Gallo, Flávia da Cruz; Garcia, Dian Souza; Simão, Renata Antoun; Habert, Alberto Cláudio

doi:10.1590/s1516-14392002000100006

Cited by 39 publications

(23 citation statements)

References 18 publications

(22 reference statements)

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“…These reactions can explain the low MV presented by the Ar-only treatments, where, without the oxygen active species, the bonds broken by charged species and photons can be re-established or diffuse to former ramified chains 20 . As demonstrated by Vidaurre et al 20 , it is possible that, via a higher plasma source power, the molecules carbon chains can be etched efficiently with Ar plasma.…”

Section: Resultsmentioning

confidence: 99%

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Influence of neutral and charged species on the plasma degradation of the stearic acid

et al. 2013

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In this work, stearic acid (SA) was degraded in an Ar-O 2 and Ar-H 2 post-discharge environment created by a plasma reactor with a microwave source and in an Ar, Ar-H 2 and Ar-O 2 DC (Direct Current) discharge environment created in a cathode-anode confined system. The afterglow region is useful for understanding the role of the chemically active species (O, O 2 , H and H 2 ). In contrast, the discharge region allows the observation of the effects of chemically active species, charged species (ions and electrons) and photons. The influence of these species on the grafting and etching of SA was evaluated by measuring the mass variation, mass variation rate and chemical composition. The results showed that when only chemically active oxygen species are present, the SA is preferentially grafted. However, when both photons and charged species are present, the SA is more efficiently etched. When the Ar-H 2 and Ar environments are utilized; the SA is not efficiently degraded.

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Section: Resultsmentioning

confidence: 99%

“…As demonstrated by Vidaurre et al 20 , it is possible that, via a higher plasma source power, the molecules carbon chains can be etched efficiently with Ar plasma. However, this possibility is not investigated in this study.…”

Section: Resultsmentioning

confidence: 99%

Influence of neutral and charged species on the plasma degradation of the stearic acid

et al. 2013

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“…It was shown [16] that for similar PSf membranes (not modified by air plasma) surface porosity is 0.4%. Composite PTMSP membranes on non-modified PSf supports have CO 2 permeance 96 GPU with 98.6% PTMSP layer in the support pores contribution in the overall mass transport resistance.…”

Section: Parametermentioning

confidence: 99%

“…For calculation previously published [16] CO 2 permeability coefficients for PTMSP were used; other calculation parameters were as follows: PTMSP selective layer thickness l1 = 4.5 µm; PTMSP penetrated into pores layer thickness 6.5 µm ( Figure 11); air plasma treated PSf support and the composite membrane CO 2 permeance as given in Tables 4 and 5. The calculated surface porosity value for hollow fiber lumen surface is 41%.…”

Section: Composite Membranes Fabricationmentioning

confidence: 99%

“…Low-temperature plasma treatment with non-polymer-forming gases has been used in recent years as a useful tool to modify the surface properties of different materials, including PSf porous membranes [9][10][11][12][13][14][15][16][17][18][19]. Plasma allows to improve adhesion or wettability, as it generates the active species, capable of activating the upper surface molecular layers without involving the polymer bulk.…”

Section: Introductionmentioning

confidence: 99%

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Development of Polysulfone Hollow Fiber Porous Supports for High Flux Composite Membranes: Air Plasma and Piranha Etching

Borisov

Ovcharova

Bakhtin

et al. 2017

Fibers

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For the development of high efficiency porous supports for composite membrane preparation, polysulfone (PSf) hollow fiber membranes (outer diameter 1.57 mm, inner diameter 1.12 mm) were modified by air plasma using the low temperature plasma treatment pilot plant which is easily scalable to industrial level and the Piranha etch (H 2 O 2 + H 2 SO 4 ). Chemical and plasma modification affected only surface layers and did not cause PSf chemical structure change. The modifications led to surface roughness decrease, which is of great importance for further thin film composite (TFC) membranes fabrication by dense selective layer coating, and also reduced water and ethylene glycol contact angle values for modified hollow fibers surface. Furthermore, the membranes surface energy increased two-fold. The Piranha mixture chemical modification did not change the membranes average pore size and gas permeance values, while air plasma treatment increased pore size 1.5-fold and also 2 order enhanced membranes surface porosity. Since membranes surface porosity increased due to air plasma treatment the modified membranes were used as efficient supports for preparation of high permeance TFC membranes by using poly[1-(trimethylsilyl)-1-propyne] as an example for selective layer fabrication.

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Asymmetric polysulfone gas separation membranes treated by low pressure DC glow discharge plasmas

Yuenyao

Tirawanichakul

Chittrakarn

2015

J of Applied Polymer Sci

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Asymmetric polysulfone (PSF) gas separation membranes were prepared at different conditions such as non‐solvent concentration, evaporation time (ET) and coagulation bath temperature (CBT). In addition, effects of low‐pressure DC glow discharge plasma on the characteristics of PSF membranes were investigated. PSF membranes both before and after plasma treatment were characterized by several techniques, including contact angle measurement, scanning electron microscope (SEM), dynamic mechanical thermal analysis (DMTA), and atomic force microscopy (AFM). Furthermore, the performance of membranes was evaluated in terms of permeability of CO2, CH4, O2, and N2 gases. The ideal selectivity of CO2/CH4 and O2/N2 and surface free energy was calculated. Results showed that the EtOH concentration, ET and CBT affect the morphology of PSF membranes. For membranes prepared from a casting solution consisting of PSF 26.0, NMP 28.0, THF 28.0, and EtOH 18.0 wt % and ET for 3 min, the maximum selectivity of untreated membrane is about 69.76 and 12.59 for CO2/CH4 and O2/N2, respectively. After plasma treatment, the ideal selectivity is receded; however, the CO2/CH4 is still higher than 40.41 at pressure of 5 bars. Finally, preparation conditions and DC glow discharge plasmas have significant effects on the characteristics of the PSF membranes and result in an increase of the gas permeation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42116.

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Surface Modification of Polymeric Materials by Plasma Treatment

Cited by 39 publications

References 18 publications

Influence of neutral and charged species on the plasma degradation of the stearic acid

Influence of neutral and charged species on the plasma degradation of the stearic acid

Development of Polysulfone Hollow Fiber Porous Supports for High Flux Composite Membranes: Air Plasma and Piranha Etching

Asymmetric polysulfone gas separation membranes treated by low pressure DC glow discharge plasmas

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