Study on Polylactic Acid (PLA) Non-Woven Materials Were Treated by Low Temperature Plasma under Different Treatment Time

2011 ◽  
Vol 332-334 ◽  
pp. 485-488
Author(s):  
Ning Chen ◽  
Ya Bin Li
Keyword(s):  
Contact Angle ◽  
Low Temperature ◽  
Polylactic Acid ◽  
High Efficiency ◽  
Treatment Time ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Wetting Contact Angle ◽  
Internal Structures ◽  
Ft Ir

The study focused on novel surface modification technology: low temperature plasma, which is characterized by clean, high efficiency and energy-saving. Polylactic acid (PLA) non-woven materials were treated by this means under different treatment time. The SEM and FT-IR were used to observe the surface properties and internal structures of samples. Whether the wetting contact angle and the biodegradable property of materials were modified by low temperature plasma was discussed. The results indicated that with the increase of treatment time, the etching effect of plasma and some functional groups especial hydrophilic groups increased significantly. When they were only treated 3 minutes the wetting contact angle declined from 113.86° to 85.49°. Additionally, the hygroscopicity and biodegradability of materials were improved by low temperature plasma treatment.

Effect of low-temperature plasma treatment and γ-irradiation on the surface properties of thin films based on polylactic acid

2020 ◽  
Vol 6 ◽  
pp. 40-55
Author(s):  
N.M. Ivanova ◽  
◽  
E.O. Filippova ◽  
A.N. Aleinik ◽  
V.F. Pichugin ◽  
...  
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Low Temperature ◽  
Polylactic Acid ◽  
Surface Properties ◽  
Polar Component ◽  
Low Temperature Plasma ◽  
Plasma Exposure ◽  
Γ Irradiation ◽  
Temperature Plasma

Effects of the low-temperature plasma exposure, γ-irradiation, and joint g-irradiation and plasma exposure on the structure and surface properties of thin films based on polylactic acid (PLA) have been investigated. Films were obtained by the method a solvent-casting. It has been shown that films based on polylactic acid have topographically different sides: a smoother inner side and embossed outer one. PLA films have properties close to those hydrophobic, with a contact angle in the range of 70°-73° regardless of the surface side and belong to a weakly polar materials. The combined effect of plasma and gamma radiation slightly changes the surface topography. The effect of low-temperature plasma on the surface of the films leads to a decrease in the contact angle by 13°-55° (9-11%) and an increase in surface energy due to the polar component. The results of in vivo experiments on rabbits are presented. Biomicroscopy, optical coherence tomography, morphological and electron microscopic examination of the cornea after implantation of initial and radiation and plasma treated films showed that implantation of the films in the anterior chamber is not accompanied by a pronounced inflammatory reaction and increased intraocular pressure, while maintaining the morphological structure of the cornea almost unchanged.

The effects of surface modification using O2 low temperature plasma on chrome tanning properties of natural leather

2018 ◽  
Vol 49 (4) ◽  
pp. 534-547 ◽  
Author(s):  
Yuanping Jiang ◽  
Jiaxun Li ◽  
Fangming Liu ◽  
Zongcai Zhang ◽  
Zhengjun Li ◽  
...  
Keyword(s):  
Surface Modification ◽  
Low Temperature ◽  
Plasma Treatment ◽  
High Efficiency ◽  
Treatment Time ◽  
Chemical Compositions ◽  
Low Temperature Plasma ◽  
Plasma Technology ◽  
Temperature Plasma ◽  
Chrome Tanning

Low temperature plasma technology has the characteristics of economy, pollution-free and high efficiency. The pioneering works were carried out by applying low temperature plasma to surface modification of natural leather and chrome tanning process, to reduce water pollution. The effects of oxygen low temperature plasma treatment on the micro-structure, chemical compositions and active groups of leather fiber were studied in this paper. The optimal low temperature plasma treatment time was 10 min, which had the maximal chrome exhausting value. The SEM results showed that the leather surface was etched rougher with time increasing. The contact angle measurements showed that the hydrophilic property of leather surface increased after low temperature plasma process. The XPS data showed that the O1s area ratios increased from 19.49% to 26.45%, the content of COOH roughly tripled after O2 low temperature plasma treatment for 10 min, and the surface chrome content increased from 1.09% to 1.31% after chrome tanning. Based on the above results, low temperature plasma technology may provide a new exploring method for high-exhaustion chrome tanning technology.

scholarly journals Low-Temperature Plasma Modification of Styrene–Butadiene Block Copolymer Surfaces for Improved Adhesion—A Kinetic Approach

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 935 ◽  
Author(s):  
Jacek Tyczkowski ◽  
Hanna Kierzkowska-Pawlak ◽  
Jan Sielski ◽  
Iwona Krawczyk-Kłys
Keyword(s):  
Block Copolymer ◽  
Low Temperature ◽  
Plasma Treatment ◽  
Treatment Time ◽  
Peel Strength ◽  
Cross Linking ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Plasma Treatment Time ◽  
Styrene Butadiene

This paper proposed a kinetic model that can describe the changes in the adhesion properties of styrene–butadiene (SBS) block copolymer surfaces under the influence of low-temperature plasma treatment. As a measure of these changes, the peel strength of joints formed between the copolymer surface and the polyurethane adhesive was chosen. Five types of low-temperature low-pressure RF plasma, two inert plasmas (Ar and He), and three reactive plasmas (O2, CO2, and CCl4) were tested. It was found that for all these types of plasma, the peel strength with the plasma treatment time first increases rapidly reaching a maximum value, and then there is a visible decrease in peel strength, after which the peel strength increases again. This dependence of the peel strength on the plasma treatment time is very well described by the proposed model, which considers three processes: (1) the generation of radical states followed by the creation of functional groups involved in the adhesive bonding process, (2) the surface cross-linking that decreases the concentration of these functional groups, and (3) the formation of nano-roughness. The model analysis revealed differences between the action of reactive and inert plasmas in the SBS surface cross-linking mechanism and preferential etching process, as well as differences in the generation of radical states between the O2 plasma (electron process) and other plasmas tested (ionic processes).

Effect of Low-Temperature Plasma Treatment on Surface Properties of LDPE Film

2014 ◽  
Vol 1015 ◽  
pp. 303-307
Author(s):  
Jiang Yan Meng ◽  
Yun Ying Wang
Keyword(s):  
Contact Angle ◽  
Low Temperature ◽  
Plasma Treatment ◽  
Testing Machine ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Ldpe Film ◽  
Static Contact ◽  
Before And After ◽  
Surface Contact Angle

Low-density polyethylene (LDPE) film was treated by low-temperature plasma. Scanning electronic microscope, electronic universal testing machine, contact angle/interfacial tension measuring instrument were used to analyze the surface morphology, surface contact angle, bonding strength and performance of LDPE film before and after they were treated by low-temperature plasma. The results show that air ambience is more appropriate than N2, CO2 for treatment. Specifically, plasma treatment in air ambience, under conditions of 44 W (power), 30 s (duration) and 60 Pa (vacuum degree), can decline static contact angle of LDPE film from 101° to 13.5°. The transiency of plasma-treated LDPE film is so obvious that storage time of longer than one hour will result in a contact angle up to 74° and loss of plasma treatment effect (timeliness). Therefore, the reversible plasma-treated LDPE film should be processed immediately.

Effect of low-temperature plasma barrier discharge on elemental composition and wettability of polylactic acid surface

2020 ◽  
Author(s):  
O. A. Laput ◽  
A. N. Ochered'ko ◽  
I. V. Vasenina ◽  
Ch. Yan ◽  
U. V. Goroshkina ◽  
...  
Keyword(s):  
Low Temperature ◽  
Elemental Composition ◽  
Polylactic Acid ◽  
Barrier Discharge ◽  
Low Temperature Plasma ◽  
Temperature Plasma

Measurement of Carboxyl Group Separated from a Thin Film Copolymerized by Low-Temperature Plasma at Atmospheric Pressure of C2H2 and CO2

2006 ◽  
Vol 321-323 ◽  
pp. 1332-1335 ◽  
Author(s):  
Hong Lae Sohn ◽  
Young Tae Cho ◽  
Bong Ju Lee
Keyword(s):  
Thin Film ◽  
Low Temperature ◽  
Atmospheric Pressure ◽  
Carboxyl Group ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Flow Rates ◽  
Co2 Gas ◽  
Plasma Generation ◽  
Ft Ir

We developed a device that makes possible the normal generation of low-temperature plasma under atmospheric pressure. For plasma generation, a radio frequency of rf (13.56 MHz) was used, for plasma gas, helium (He), and for material gases, acetylene (C2H2) and toluene (C6H5CH3) were used. As a result of measuring Fourier transform infrared (FT-IR) after adding the CO2 gas to the generated plasma, the absorption of C=O (carboxyl group) was observed around 1715 cm-1. When the flow rates of the added CO2 increased, the absorption peak increased at the same time, and we knew that this originated from the CO2 molecules.

Hydrophobic Modification of PVDF

2011 ◽  
Vol 687 ◽  
pp. 658-661 ◽  
Author(s):  
Xiao Xing Shen ◽  
Wen Fang Yang ◽  
Qing Fu Zhang
Keyword(s):  
Carbon Dioxide ◽  
Contact Angle ◽  
Low Temperature ◽  
Supercritical Carbon Dioxide ◽  
Time Pressure ◽  
Low Temperature Plasma ◽  
Hydrophobic Modification ◽  
Hydrophobic Property ◽  
Hydrophobic Properties ◽  
Temperature Plasma

For preparation of an architecture membrane with hydrophobic properties, a method combining supercritical carbon dioxide (scCO2 ) and low temperature plasma treatment was used. The effects of treating time, pressure and temperature in scCO2 fluid on surface hydrophobic property were studied. The results showed that the contact angle of the membrane that was firstly modified by low temperature plasma and then treated in scCO2 fluid was up to 141°from 80°. In addition, the optimal hydrophobic modification conditions in scCO2 were 100°C、25MPa and 6h, and the hydrophobic property of the membrane that treated by plasma improved, the most suitable time was 300s.

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