Surface and Electrochemical Properties of Plasma-Treated Polypropylene Track Membrane

Kravets, L. I.; Gilman, A. B.; Yablokov, M. Yu.; Елинсон, В. М.; Mitu, B.; Dinescu, G.

doi:10.1002/ppap.201200084

Cited by 17 publications

(11 citation statements)

References 40 publications

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“…As seen, the pores on the surface of modified membranes are larger compared to the control sample. According to our experimental results [38], the pore size increases in membranes etched in air and oxygen plasmas (by 13 and 42%, respectively) is larger compared to membranes etched in a nitrogen plasma. In addition, plasma treatment of track membranes, whose pores are cylinder-shaped channels, changes the shape of the pores to form asymmetric membranes [32][33][34][35].…”

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 83%

“…Exposure to an air and, especially, oxygen plasma essentially affects the morphology of the membrane surface. The R q value for a membrane modified by an air plasma is 78.6 ± 5.2 nm, whereas for a membrane modified by an oxygen plasma this value increases to 196 ± 12 nm [38]. Such structuring of the surface of membranes essentially improves their adhesion characteristics [30].…”

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 94%

“…The enhanced wettability of the surface of hydrophobic membranes favors better penetration of water into pores, which enhances the water permeability of plasma-treated membranes. Thus, we found [38] that the starting polypropylene track membrane is water impermeable at pressure differentials of up 10 5 Pa, whereas plasma-treated membranes containing polar groups in the surface layer become water-permeable.…”

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 96%

“…The wettability of membranes is therewith much enhanced. For example, if the contact angle (θ) of the starting polypropylene track membrane is 120°, then after treatment by nitrogen, air, and oxygen plasmas this angle decreases to 75°, 65°, and 60°, respectively [38]. The enhanced wettability of the surface of hydrophobic membranes favors better penetration of water into pores, which enhances the water permeability of plasma-treated membranes.…”

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 98%

“…Treatment of polymer membranes by RF (including pulsed) and microwave discharges in nonpolymerforming gases results in etching (physical sputtering or oxidation) of the polymer matrix , the rate of which depends on the nature of the plasma-forming gas. For example, the surface etching of membranes in inertgas or hydrogen plasmas by physical sputtering is inconsiderable [20,21], whereas in nitrogen, oxygen, or air plasmas the rate of etching (primarily oxidative) in analogous conditions is several times higher [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Surface etching of polymer membranes entails increased pore diameter [24][25][26][27][28][29][30].…”

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 99%

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Modification of polymer membrane properties by low-temperature plasma

2015

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The results of investigations into the use of low-temperature plasma for modification of polymer membranes are considered. The basic lines of research in this area are highlighted. It is shown that plasma treatment is quite an effective tool for both improving properties of existing polymer membranes and manufacturing new composite membranes with unique characteristics. Examples of successful use of plasmamodified membranes in various branches of industry and medicine are given.

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Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 83%

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 94%

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 96%

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 98%

Section: Treatment Of Polymer Membranes By Plasma Of Inorganic Gasesmentioning

confidence: 99%

See 3 more Smart Citations

Modification of polymer membrane properties by low-temperature plasma

2015

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Surface roughness and hydrophilicity enhancement of polyolefin-based membranes by three kinds of plasma methods

Yan

Yang

et al. 2015

Surf. Interface Anal.

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The introduction of antibacterial property, conductivity, wettability and antithrombogenicity into polyolefin‐based membranes has evoked much attention, which can be achieved by coating hydrophilic polymers. Therefore, it is necessary to modify the roughness and hydrophilicity of polyolefin‐based membranes to enhance the coating ability. In this paper, three kinds of plasma methods, including inductively coupled (ICP) plasma, radio frequency low pressure (RFP) plasma and atmospheric dielectric barrier discharge (DBD) plasma, were used to modify the surface of the polyethylene (PE), polypropylene (PP) and polyester‐polypropylene (PET–PP) membranes. The surface roughness of the plasma‐modified PE, PP and PET–PP films was investigated by scanning electron microscopy (SEM) and atomic force microscope (AFM). The polar functional groups of films were observed by energy dispersive spectrometer (EDX) and X‐ray photoelectron spectroscopy (XPS). Besides, the hydrophilicity of the plasma‐modified PE, PP and PET–PP films was evaluated by water contact angle measurement. It was found that the surface roughness and hydrophilicity of plasma‐modified PE, PP and PET–PP films increased with the generation of oxygen‐containing functional groups (i.e. C―O, and CO). The PET–PP membranes were treated by RFP plasma at different processing powers and times. These results indicated that plasma is an effective way to modify films, and the treatment time and power of plasma had a certain accumulation effect on the membranes' hydrophilicity. As for the roughness and hydrophilicity, the DBD plasma modifies the PE film, which is the optimum way to get the ideal roughness and hydrophilicity. Copyright © 2015 John Wiley & Sons, Ltd.

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Preparation and Comparison of Hydrolase-Coated Plastics

2016

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Polypropylene and polyethylene were coated with alpha-Chymotrypsin (a-CT) or subtilisin Carlsberg (SubC) or Burkholderia cepacia lipase (lipase BC) by different immobilization procedures, such as physical adsorption and covalent linking. This latter procedure was based on the chemical functionalization of the plastic surface by oxygen gas plasma treatment. Immobilization of the enzyme was carried out by using as cross-linking agent i) glutaraldehyde (GA) or ii) N'-diisopropylcarbodiimide (DIC) and N-hydroxysuccinimide (NHS). The effects of duration of the plasma treatment and the type of the immobilization procedure on the transesterification activity of the enzyme were investigated. In general polypropylene resulted a better support than polyethylene. Moreover, a-CT showed higher transesterification activity when immobilized with GA, while for SubC, DIC and NHS were better cross-linking agents than GA. No activity was observed with these enzymes when immobilization was carried out by physical adsorption. On the contrary, lipase BC immobilized by physical adsorption was even more active than the free enzyme. Concerning thermal stability, immobilized SubC was less stable than the free enzyme. Overall, these results show that plastics endowed with biocatalytic properties could be obtained by simple immobilization protocols and that optimal immobilization conditions depend on the type of starting plastic, plasma treatment, cross-linking method, and the nature of the enzyme.

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Surface and Electrochemical Properties of Plasma-Treated Polypropylene Track Membrane

Cited by 17 publications

References 40 publications

Modification of polymer membrane properties by low-temperature plasma

Modification of polymer membrane properties by low-temperature plasma

Surface roughness and hydrophilicity enhancement of polyolefin-based membranes by three kinds of plasma methods

Preparation and Comparison of Hydrolase-Coated Plastics

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