scholarly journals Effects of Surface Modification of MWCNT on the Mechanical and Electrical Properties of Fluoro Elastomer/MWCNT Nanocomposites

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Tao Xu ◽  
Jinghui Yang
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Electrical Properties ◽  
Plasma Treatment ◽  
Polyvinylidene Fluoride ◽  
Composite Films ◽  
Mechanical Tests ◽  
Dielectric Behavior ◽  
Acid Oxidation ◽  
Multiwalled Carbon

Surface modification is a good way to improve the surface activity and interfacial strength of multiwalled carbon nanotubes (MWCNTs) when used as fillers in the polymer composites. Among the reported methods for nanotube modification, mixed acid oxidation and plasma treatment is often used by introducing polar groups to the sidewall of MWCNT successfully. The purpose of this study is to evaluate the effect of different surface modification of MWCNT on the mechanical property and electrical conductivity of Fluoro-elastomer (FE)/MWCNT nanocomposites. MWCNTs were surface modified by mixed oxidation and CF4plasma treatment and then used to reinforce the fluoro elastomer (FE, a copolymer of trifluorochloroethylene and polyvinylidene fluoride). FE/MWCNT composite films were prepared from mixture solutions of ethylacetate and butylacetate, using untreated CNTs (UCNTs), acid-modified CNTs (ACNTs), and CF4plasma-modified CNT (FCNTs). In each case, MWCNT content was 0.01 wt%, 0.05 wt%, 0.1 wt%, and 0.2 wt% with respect to the polymer. Morphology and mechanical properties were characterized by using scanning electron microscopy (SEM), Raman spectroscopy, as well as dynamic mechanical tests. The SEM results indicated that dispersion of ACNTs and especially FCNTs in FE was better than that of UCNTs. DMA indicated mechanical properties of FCNT composites were improved over ACNT and UCNT filled FE. The resulting electrical properties of the composites ranged from dielectric behavior to bulk conductivities of 10-2 Sm-1and were found to depend strongly on the surface modification methods of MWCNTs.

Mechanical Properties Of Polyaniline / Multi-walled Carbon Nanotube Composite Films

2003 ◽  
Vol 791 ◽  
Author(s):  
P. C. Ramamurthy ◽  
W. R. Harrell ◽  
R. V. Gregory ◽  
B. Sadanadan ◽  
A. M. Rao
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Films ◽  
Weight Percent ◽  
Organic Electronic Devices ◽  
Multiwalled Carbon ◽  
Multi Walled Carbon Nanotube ◽  
Contact Devices ◽  
Carbon Nanotube Composite

ABSTRACTHigh molecular weight polyaniline / multi-walled carbon nanotube composite films were fabricated using solution processing. Composite films with various weight percentages of multiwalled carbon nanotubes were fabricated. Physical properties of these composites were analyzed by thermogravimetric analysis, tensile testing, and scanning electron microscopy. These results indicate that the addition of multiwalled nanotubes to polyaniline significantly enhances the mechanical properties of the films. In addition, metal–semiconductor (composite) (MS) contact devices were fabricated, and it was observed that the current level in the films increased with increasing multiwalled nanotube content. Furthermore, it was observed that polyaniline containing one weight percent of carbon nanotubes appears to be the most promising composition for applications in organic electronic devices.

Surface Modification of Electrospun Polyvinylidene Fluoride Nanofiber Membrane by Plasma Treatment for Protein Detection

2013 ◽  
Vol 13 (1) ◽  
pp. 674-677 ◽  
Author(s):  
Eugene Cho ◽  
Chan Kim ◽  
Ju-Young Park ◽  
Cheol Ho Hwang ◽  
Jin Hee Kim ◽  
...  
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Polyvinylidene Fluoride ◽  
Protein Detection ◽  
Nanofiber Membrane

scholarly journals Reinforcement of Multiwalled Carbon Nanotube in Nitrile Rubber: In Comparison with Carbon Black, Conductive Carbon Black, and Precipitated Silica

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Atip Boonbumrung ◽  
Pongdhorn Sae-oui ◽  
Chakrit Sirisinha
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
Carbon Black ◽  
Nitrile Rubber ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Precipitated Silica ◽  
Conductive Carbon Black ◽  
Filler Network

The properties of nitrile rubber (NBR) reinforced by multiwalled carbon nanotube (MWCNT), conductive carbon black (CCB), carbon black (CB), and precipitated silica (PSi) were investigated via viscoelastic behavior, bound rubber content, electrical properties, cross-link density, and mechanical properties. The filler content was varied from 0 to 15 phr. MWCNT shows the greatest magnitude of reinforcement considered in terms of tensile strength, modulus, hardness, and abrasion resistance followed by CCB, CB, and PSi. The MWCNT filled system also exhibits extremely high levels of filler network and trapped rubber even at relatively low loading (5 phr) leading to high electrical properties and poor dynamic mechanical properties. Although CCB possesses the highest specific surface area, it gives lower level of filler network than MWCNT and also gives the highest elongation at break among all fillers. Both CB and PSi show comparable degree of reinforcement which is considerably lower than CCB and MWCNT.

The Effect of Surface Modification of TiO2 on Mechanical Properties of Polyethylene Composite Film

2010 ◽  
Vol 93-94 ◽  
pp. 300-303 ◽  
Author(s):  
N. Tangchantra ◽  
Jittiporn Kruenate ◽  
Chuanchom Aumnate ◽  
Thammarak Sooksomsong
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Composite Films ◽  
Titanium Isopropoxide ◽  
Nano Particles ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Polyethylene Composite ◽  
Silane Coupling ◽  
Measurement Surface

To achieve a proper dispersion of nano-particles polymer matrix and to yield a better compatibility between the nano-particles and polymeric material, the use of different coupling agents for surface modification of nano-particle is recommended. In this research, surface of TiO2 was modified by hydrolytic condensation of titanium isopropoxide with three different silane coupling agents, hexadecyl trimethoxysilane (HTMS), triethoxyvinylsilane (TEVS) and aminopropyl trimethoxysilane (APS). The grafting of silane coupling agents on the TiO2 nano-particles surface was characterized using TGA and FTIR techniques. Mechanical properties of polyethylene composite films were evaluated via tensile strength measurement. Surface morphology of the particle was studied by SEM and TEM. The result showed that surface treatment TiO2 nano-particles with TEVS could improve dispersibility of TiO2 and showed the optimum mechanical properties.

The “Aachen” keratoprosthesis: A New Approach towards Successful Keratoprosthesis-Surgery

1998 ◽  
Vol 21 (1) ◽  
pp. 52-57
Author(s):  
T. Von Fischern ◽  
S. Langefeld ◽  
L. Yuan ◽  
N. Völcker ◽  
M. Reim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Intraocular Pressure ◽  
Light Transmission ◽  
Pressure Rise ◽  
Mechanical Tests ◽  
Optical Quality ◽  
Membrane Formation ◽  
Scleral Fixation ◽  
Retroprosthetic Membrane

Background None of the keratoprostheses available today is absolutely successful in the long term, neither the problems of extrusion, retroprosthetic membrane formation and intraocular pressure rise are yet solved. A new type of keratoprosthesis is required which can show improved ingrowth characteristics and allow intraocular pressure measurements. In order to possibly meet the above mentioned requirements we developed a flexible silicone keratoprosthesis with scleral fixation and chemical surface modification. Methods The one-piece keratoprosthesis is made of silicone rubber. Its optical zone has a diameter of 11 mm and is 0.3 mm thick. The surface-modified haptic consists of a scleral rim and eight branches for scleral fixation. A ridge at the back of the keratoprosthesis fitting into the trephination hole shall avoid leakage and retroprosthetic membrane formation. Optical and mechanical qualities are characterised by tensile tests, spectrophotometry and topography. Results A method for keratoprosthesis-production was established. The optical quality of the device was improved by submicron lathing of the mould. Spectrophotometry showed high visible and ultraviolet light transmission of the silicone. Mechanical tests with silicone samples revealed high tensile strength and elongation at break. The mechanical properties were not impaired by surface modification. Conclusions The production of a flexible silicone keratoprosthesis with high optical and mechanical properties was established. Its use both for the treatment of permanently opacified corneas and as temporary keratoprosthesis seems to be possible.

scholarly journals A Study on the Effect of Plasma Treatment for Waste Wood Biocomposites

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
MiMi Kim ◽  
Heung Soo Kim ◽  
Joong Yeon Lim
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Plasma Polymerization ◽  
Atmospheric Pressure Plasma ◽  
Single Species ◽  
Wood Powder ◽  
Waste Wood ◽  
Pressure Plasma

The surface modification of wood powder by atmospheric pressure plasma treatment was investigated. The composites were manufactured using wood powder and polypropylene (wood powder: polypropylene = 55 wt% : 45 wt%). Atmospheric pressure plasma treatment was applied under the condition of 3 KV,17±1 KHz, 2 g/min. Helium was used as the carrier gas and hexamethyl-disiloxane (HMDSO) as the monomer to modify the surface property of the waste wood biocomposites by plasma polymerization. The tensile strengths of untreated waste wood powder (W3) and single species wood powder (S3) were about 18.5 MPa and 21.5 MPa while those of plasma treated waste wood powder (PW3) and plasma treated single species wood powder (PS3) were about 21.2 MPa and 23.4 MPa, respectively. Tensile strengths of W3 and S3 were improved by 14.6% and 8.8%, respectively. From the analyses of mechanical properties and morphology, we conclude that the interfacial bonding of polypropylene and wood powder can be improved by atmospheric pressure plasma treatment.

scholarly journals Mechanical properties and connectivity evaluation of a conductive coated piezoceramic/polymer composite

2014 ◽  
Vol 04 (03) ◽  
pp. 1450019 ◽  
Author(s):  
Gilberto de Campos Fuzari ◽  
Walter Katsumi Sakamoto
Keyword(s):  
Lead Zirconate Titanate ◽  
Polyvinylidene Fluoride ◽  
Volume Fraction ◽  
Composite Films ◽  
Lead Zirconate ◽  
Mechanical Tests ◽  
Piezoelectric Composite ◽  
Mechanical Resistance ◽  
Dielectric Measurements ◽  
Pvdf Matrix

In the present work, piezoelectric composite films made of Polyaniline (PAni) coated Lead Zirconate Titanate (PZT) particles immersed into polyvinylidene fluoride (PVDF) matrix were characterized by mechanical tests, and the connectivity of the composite sample was determined using dielectric measurements and applying the Poon–Shin model. The composite was considered a binary system with coated PZT particles as one phase and the polymer matrix the other one. To support the result obtained from theoretical analysis, scanning electron microscopy of the composites were done. It was observed a decrease up to 85% on the mechanical resistance when the ceramic volume fraction increases from 0% to 40%. Furthermore, the composite film no longer can be considered with 0–3 connectivity when the ceramic content is 30 vol.% or over.

scholarly journals Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications

2013 ◽  
Vol 15 ◽  
pp. 90-101 ◽  
Author(s):  
Sujan Kumar Das ◽  
Jahid M.M. Islam ◽  
Monirul Hasan ◽  
Humayun Kabir ◽  
Md Abdul Gafur ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electrical Properties ◽  
Composite Films ◽  
Young Modulus ◽  
Electrically Conductive ◽  
Elongation At Break ◽  
Ohmic Behavior ◽  
Nanocrystalline Thin Film ◽  
Electrically Conductive Composite

Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6% sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6% sand containing composite film are found to be 4.445 MPa, 9.76%, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6% sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.

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