scholarly journals Exploiting Plasma Exposed, Natural Surface Nanostructures in Ramie Fibers for Polymer Composite Applications

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1631 ◽  
Author(s):  
Sameer F. Hamad ◽  
Nicola Stehling ◽  
Simon A. Hayes ◽  
Joel P. Foreman ◽  
C. Rodenburg
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Polymer Matrix ◽  
Fiber Surface ◽  
Surface Characteristics ◽  
Plant Fibers ◽  
Angle Measurements ◽  
Surface Nanostructures ◽  
Ramie Fibers ◽  
Mechanical Tensile

Nanoscale surface morphology of plant fibers has important implications for the interfacial bonding in fiber-polymer composites. In this study, we investigated and quantified the effect of plasma-surface modification on ramie plant fibers as a potential tool for simple and efficient surface modification. The extensive investigation of the effects of plasma treatment of the fiber surface nano-morphology and its effect on the fiber-polymer interface was performed by Low-Voltages Scanning Electron Microscopy (LV-SEM), infrared spectroscopy (FT-IR) analysis, fiber-resin angle measurements and mechanical (tensile) testing. The LV-SEM imaging of uncoated plasma treated fibers reveals nanostructures such as microfibrils and elementary fibrils and their importance for fiber mechanical properties, fiber wettability, and fiber-polymer matrix interlocking which all peak at short plasma treatment times. Thus, such treatment can be an effective in modifying the fiber surface characteristics and fiber-polymer matrix interlocking favorably for composite applications.

scholarly journals Effects of Plasma Treatment on Cooking and Physical Qualities of Pigmented Thai Rice

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Metanee Noppakun ◽  
◽  
Srisuwan Naruenartwongsakul ◽  
Pisit Srisuriyajan ◽  
Yuthana Pimolsiripol ◽  
...  
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Treatment Time ◽  
Surface Characteristics ◽  
Expansion Ratio ◽  
Contact Angles ◽  
Rice Grain ◽  
Rice Varieties ◽  
Plasma Production ◽  
Pigmented Rice

Plasma surface modification processes account for most of the commercial uses of surface modification because they are fast, efficient methods for improving the adhesion, wettability properties and other surface characteristics of a variety of materials. This research was aimed to investigate of surface modification of pigmented rice by plasma technique. Two rice varieties namely Kum Doi Saket and Hom Nil rice were used. The samples were subjected to plasma treatment with different gas types to determine suitable gas type. The types of gas for plasma treatment were argon, nitrogen and air. The output voltage of the plasma was 0.1428 W at the frequency of 110 Hz and treatment time of 40 min. It was found that plasma treatment with various gas types on the samples caused a reduction in cooking time and increase in water uptake ratio, length expansion ratio and volume expansion ratio, an increase in water absorption, a decrease in contact angles as compared to untreated sample. These results were related to etching of the bran layer of the rice grain which allowed better water transfer into the grain during cooking. It was also found that plasma production using plasma gas had more effect on texture of the rice grains, as compared to without plasma treatment.

Utilization of Plasma Treated Polymeric Macro-Fibers as Reinforcement in Concrete Constructions

2017 ◽  
Vol 1144 ◽  
pp. 70-75
Author(s):  
Jan Trejbal ◽  
Josef Fládr ◽  
Lubomír Kopecký
Keyword(s):  
Mechanical Properties ◽  
Plasma Treatment ◽  
Treatment Duration ◽  
Negative Impact ◽  
Fiber Surface ◽  
Cement Matrix ◽  
Bending Tests ◽  
Four Point Bending ◽  
Angle Measurements ◽  
Contact Angle Measurements

Polymeric macro fibers BeneSteel having diameter equal to 480 μm and length 55 mm were treated in low pressure oxygen plasma by different treatment duration from 5 to 480 s to attain the better interaction with cement matrix (focused on both, chemical and physical bond). An effect of realized treatment was examined through fiber surface water wettability observation by direct horizontal optical method enabling contact angle measurements. Next, the pertinent negative impact of plasma treatment on fibers mechanical properties was examined by several methods. It was shown that the most effective plasma treatment duration is up to 30 s. Thus treated fibers exhibited the better wettability by ca. 110 % in comparison with reference fibers, while its mechanical properties were not negatively affected. Finally, reference and 30 s plasma treated fibers were used as randomly dispersed reinforcement in concrete specimens. Mechanical properties of these composites were examined by four-point bending tests. Specimens containing treated fibers exhibited bigger fracture toughness by ca. 30 % beside the reference ones, while the first cracking strength stayed constant in all cases.

The Effect of Air Cold Plasma Treatment on UHMWPE Fiber Surface Modification

2014 ◽  
Vol 983 ◽  
pp. 280-283
Author(s):  
Xiao Xia Lin ◽  
Xin Huang ◽  
Yi Min Wang
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Fiber Surface ◽  
Processing Parameters ◽  
Air Plasma ◽  
Uhmwpe Fiber ◽  
Pull Out ◽  
Polyethylene Fiber ◽  
Ultra High Molecular Weight ◽  
Air Plasma Treatment

This paper adopted the air plasma treatment on ultra-high molecular weight polyethylene fiber surface modification. SEM, tensile test and fiber bundle pull out test were used to characterize the influence of processing time and voltage on the effect of fiber surface modification. The results showed that the optimum conditions of surface modification were obtained by the processing parameters of pressure 15Pa, time 5 minutes and voltage 15V. At this point, the bonding strength was increased by about 82.4%, and the breaking strengthreduced by 9.7%.

Study of Transcrystallization in Polymer Composites

1989 ◽  
Vol 170 ◽  
Author(s):  
Benjamin S. Hsiao ◽  
J. H. Eric
Keyword(s):  
Thermal Conductivity ◽  
Free Energy ◽  
Carbon Fiber ◽  
Plasma Treatment ◽  
Polymer Composites ◽  
High Performance ◽  
Interfacial Strength ◽  
Fiber Surface ◽  
Semicrystalline Polymers ◽  
First Case

AbstractTranscrystallization of semicrystalline polymers, such as PEEK, PEKK and PPS, in high performance composites has been investigated. It is found that PPDT aramid fiber and pitch-based carbon fiber induce a transcrystalline interphase in all three polymers, whereas in PAN-based carbon fiber and glass fiber systems, transcrystallization occurs only under specific circumstances. Epitaxy is used to explain the surface-induced transcrystalline interphase in the first case. In the latter case, transcrystallization is probably not due to epitaxy, but may be attributed to the thermal conductivity mismatch. Plasma treatment on the fiber surface showed a negligible effect on inducing transcrystallization, implying that surface-free energy was not important. A microdebonding test was adopted to evaluate the interfacial strength between the fiber and matrix. Our preliminary results did not reveal any effect on the fiber/matrix interfacial strength of transcrystallinity.

scholarly journals Chemical Modification as a Method of Improving Biocompatibility of Carbon Nonwovens

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3198
Author(s):  
Justyna Frączyk ◽  
Sylwia Magdziarz ◽  
Ewa Stodolak-Zych ◽  
Ewa Dzierzkowska ◽  
Dorota Puchowicz ◽  
...  
Keyword(s):  
Surface Modification ◽  
Cellular Response ◽  
Fiber Surface ◽  
Thermal Conversion ◽  
Cartilage Tissue ◽  
Polar Component ◽  
Nonwoven Fabrics ◽  
Biological Compatibility ◽  
Starting Point

It was shown that carbon nonwoven fabrics obtained from polyacrylonitrile fibers (PAN) by thermal conversion may be modified on the surface in order to improve their biological compatibility and cellular response, which is particularly important in the regeneration of bone or cartilage tissue. Surface functionalization of carbon nonwovens containing C–C double bonds was carried out using in situ generated diazonium salts derived from aromatic amines containing both electron-acceptor and electron-donor substituents. It was shown that the modification method characteristic for materials containing aromatic structures may be successfully applied to the functionalization of carbon materials. The effectiveness of the surface modification of carbon nonwoven fabrics was confirmed by the FTIR method using an ATR device. The proposed approach allows the incorporation of various functional groups on the nonwovens’ surface, which affects the morphology of fibers as well as their physicochemical properties (wettability). The introduction of a carboxyl group on the surface of nonwoven fabrics, in a reaction with 4-aminobenzoic acid, became a starting point for further modifications necessary for the attachment of RGD-type peptides facilitating cell adhesion to the surface of materials. The surface modification reduced the wettability (θ) of the carbon nonwoven by about 50%. The surface free energy (SFE) in the chemically modified and reference nonwovens remained similar, with the surface modification causing an increase in the polar component (ɣp). The modification of the fiber surface was heterogeneous in nature; however, it provided an attractive site of cell–materials interaction by contacting them to the fiber surface, which supports the adhesion process.

Effect of fiber surface modification on water absorption and hydrothermal aging behaviors of GF/pCBT composites

2015 ◽  
Vol 82 ◽  
pp. 84-91 ◽  
Author(s):  
Bin Yang ◽  
Jifeng Zhang ◽  
Limin Zhou ◽  
Mingkun Lu ◽  
Wenyan Liang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Water Absorption ◽  
Fiber Surface ◽  
Hydrothermal Aging

Valence variation of phase-pure M1 MoVNbTe oxide by plasma treatment for improved catalytic performance in oxidative dehydrogenation of ethane

RSC Advances ◽  
2015 ◽  
Vol 5 (111) ◽  
pp. 91295-91301 ◽  
Author(s):  
Xin Chen ◽  
Qianli Yang ◽  
Bozhao Chu ◽  
Hang An ◽  
Yi Cheng
Keyword(s):  
Surface Modification ◽  
Metal Oxide ◽  
Plasma Treatment ◽  
Oxidative Dehydrogenation ◽  
Oxidation State ◽  
Active Sites ◽  
Oxygen Plasma ◽  
Catalyst Surface ◽  
Catalytic Performance ◽  
Phase Pure

This work presents a new method of catalyst surface modification by using oxygen plasma to change the oxidation state of active sites in metal oxide catalysts.

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