scholarly journals Antistatic effect of glycerol monostearate on volume resistivity and mechanical properties of nanocomposite polystyrene-nanocrystal cellulose

2018 ◽  
Author(s):  
Adriana ◽  
Ramzi Jalal ◽  
Yuniati
Keyword(s):  
Mechanical Properties ◽  
Volume Resistivity ◽  
Glycerol Monostearate ◽  
Antistatic Effect

Micro-Injection Molding of Polymer Nanocomposites Composition-Process-Properties Relationship

2021 ◽  
Vol 36 (3) ◽  
pp. 276-286
Author(s):  
Z. Dekel ◽  
S. Kenig
Keyword(s):  
Mechanical Properties ◽  
Plug Flow ◽  
Volume Resistivity ◽  
Process Conditions ◽  
Polyamide 66 ◽  
Fountain Flow ◽  
Microinjection Molding ◽  
Injection Molded ◽  
Composition Process ◽  
Rheological Percolation

Abstract The mechanical, electrical, thermal, and rheological properties of micro injection molded nanocomposites comprising 2% and 5% carbon nanotubes (CNTs) incorporated in polycarbonate (PC), and polyamide 66 (PA) were studied. The design of experiments method was used to investigate the composition-process – properties relationship. Results indicated that the process variables significantly affected the flow patterns and resulting morphology during the filling stage of the microinjection molding (lIM) process, using 0.45 mm diameter lIM samples. Two distinct flow regimes have been identified in lIM using the low cross-section samples. The first was a conventional “fountain flow,” which resulted in a skin/core structure and reduced volume resistivity up to 10 X cm in the case of 5% CNTs and up to 100 X cm in 2% CNTs, in both polymers, respectively. In addition, inferior mechanical properties were obtained, attributed to polymer degradation under high shear rate conditions, when practicing high injection speeds, high mold temperatures, and high screw rotation velocities. The second was a “plug flow” due to wall slippage, obtained under low injection speeds, low mold temperatures, and low rotation velocities, leading to a substantial increase in modulus of elasticity (60%) with increased electrical resistivity up to 103 X cm for 5% CNTs and 105 X cm for 2% CNTs, respectively. The rheological percolation threshold was obtained at 2% CNTs while the electrical threshold was attained at 0.4% CNTs, in both polymers. It was concluded that in lIM, the process conditions should be closely monitored. In the case of high viscous heating, degradation of mechanical properties was obtained, while skin- core morphology formation enhanced electrical conductivity.

Electromagnetic Shielding Boards Produced with Tetra Paks Waste & Metal Fibers

2012 ◽  
Vol 518-523 ◽  
pp. 3349-3357 ◽  
Author(s):  
Chang Yan Xu ◽  
Jie Liu ◽  
Xu Dong Zhu
Keyword(s):  
Mechanical Properties ◽  
Volume Resistivity ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Fiber Layer ◽  
Composite Board ◽  
Food And Beverage ◽  
Alternative Material ◽  
Interior Finish ◽  
Beverage Packaging

Just like other paper/plastic/aluminum (PPA) composites, Tetra Pak-package-material (Tetra Paks) has excellent water and vapor barrier abilities, and is widely used in food and beverage packaging industry. However, serious environmental problem follows due to its long service life. In this paper, a novel electromagnetic shielding composite board was developed with recycled Tetra Paks and copper-iron mixed fibers. The influence of Cu/Fe ratio and mat configuration on board shielding effectiveness (SE), volume resistivity (VR) and mechanical properties were investigated. The results showed that the boards with copper-iron mixed fiber layers showed better electromagnetic shielding performance than those with only iron or copper fiber layer. The SE of the boards was improved with higher copper fiber content. The location of the metal fiber layers in the mat had a significant influence on board electromagnetic shielding performance. A symmetrical sandwich structure was found beneficial to better shielding performance, and in the same condition of wave frequency and shielding material thickness, the shielding system with a Fe core exhibited better shielding performance than that with a Cu core. The ratio of Cu/Fe and the configuration of mat both had significant influences on mechanical properties of the boards. It can be concluded that qualified electromagnetic shielding composite board could be produced with Tetra Paks wastes and copper-iron mixed fibers. Showing both environmental and economic values, this type of board could be considered as an alternative material used in packaging, interior finish, furniture, and other applications.

Development of Poly(dimethylsiloxane)/BaTiO3 Nanocomposites as Dielectric Material

2012 ◽  
Vol 622-623 ◽  
pp. 897-900 ◽  
Author(s):  
Suryakanta Nayak ◽  
Tapan Kumar Chaki ◽  
Dipak Khastgir
Keyword(s):  
Mechanical Properties ◽  
Dielectric Constant ◽  
Electron Microscope ◽  
Barium Titanate ◽  
Dielectric Material ◽  
Volume Resistivity ◽  
Filler Concentration ◽  
Base Matrix ◽  
Batio3 Nanoparticles ◽  
Scanning Electron

Polymer-ceramic nanocomposites with controlled dielectric properties are prepared using poly(dimethylsiloxane) elastomer as base matrix and barium titanate as filler. Barium titanate (BaTiO3) used in this study is prepared by solid state reaction at high temperature. The effect of BaTiO3 nanoparticles on electrical and mechanical properties are extensively studied and found that dielectric constant of nanocomposites increases significantly with the increase in BaTiO3 concentration where as volume resistivity decreases continuously. Different mechanical properties are also studied for all the composites in order to find the effect of filler concentration. Morphology of the prepared BaTiO3 was studied by field emission scanning electron microscope (FESEM).

Effect of Multi-Wall Carbon Nanotubes on the Properties of Natural Rubber Nanocomposites

2013 ◽  
Vol 832 ◽  
pp. 338-343 ◽  
Author(s):  
Azira Abd. Aziz ◽  
A.I.H. Habibah Dayang ◽  
Abu Bakar Suriani ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Natural Rubber ◽  
Mechanical Test ◽  
Chemical Properties ◽  
Tensile Modulus ◽  
Physical And Mechanical Properties ◽  
Volume Resistivity ◽  
Multi Wall Carbon Nanotubes ◽  
Initial Modulus

Multi-walled carbon nanotubes (MWNTs) were used to prepare epoxidised natural rubber (ENR) nanocomposites. Our attempt to achieve nanostructures in MWNTs/ENR nanocomposites were formed by incorporating carbon nanotubes in a polymeric solution. Using this technique, nanotubes can be dispersed homogeneously in the ENR matrix with an attempt to increase the mechanical properties of these nanocomposites. The properties of the nanocomposites such as volume resistivity, tensile strength and tensile modulus were studied. Mechanical test results show an increase in the initial modulus for up to 14 times in relation to pure ENR. In addition to mechanical testing, the dispersion state of the MWNTs into ENR was studied by field emission electron microscopy (FESEM) and atomic force microscope (AFM) in order to understand the morphology of the resulting system. According to the present study, application of the physical and mechanical properties of carbon nanotubes to ENR can result in rubber products which have improved mechanical, physical and chemical properties.

An Experimental Evaluation on Change in Impedance of TRIP Steel Subjected to Plastic Deformation at Various Strain Rates

2013 ◽  
Vol 535-536 ◽  
pp. 445-448 ◽  
Author(s):  
Daiki Inoshita ◽  
Shiro Yamanaka ◽  
Takeshi Iwamoto
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Martensitic Transformation ◽  
Strain Rate ◽  
Trip Steel ◽  
Rate Sensitivity ◽  
Volume Resistivity ◽  
Strain Rates ◽  
Trip Steels ◽  
The Relationship

For automotive industries, weight of an automobile can be reduced if TRIP steel which has excellent mechanical properties dominated by strain-induced martensitic transformation (SIMT) can be applied to shock absorption members. However, strain rate sensitivity of TRIP steels has not been fully understood because a relationship between a strain rate and an amount of martensite produced by SIMT is still unclear. In previous studies, volume resistivity and impedance have been measured to obtain information on the amount of produced martensite, however, these studies have not been succeeded to clarify the relationship. Here, by focusing a property that martensite shows ferromagnetism, it is attempted that impedance of TRIP steel is measured at various strain rates during the deformation by using prototype coil and circuits.

Research on Properties of Crosslinkable Polymer-Based Semi-Conductive Shielding Composites

2014 ◽  
Vol 1004-1005 ◽  
pp. 517-520
Author(s):  
Bao Zhong Han ◽  
Cheng Cheng Zhang ◽  
Bang An ◽  
Chun Yang Li ◽  
Chang Ming Li
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Rheological Properties ◽  
High Voltage ◽  
Volume Resistivity ◽  
Melt Blending ◽  
Matrix Resin ◽  
Conductive Composites ◽  
Different Types ◽  
Shielding Composites

In order to select effective carbon black (CB) and matrix resin for fabricating semi-conductive shielding materials of XLPE insulated high voltage cable, the crosslinkable composites were prepared by melt blending different types of CB with three types of copolymer resin, and the crosslinking samples were compressed. The electrical conductivity, mechanical properties, thermal elongation properties and rheological properties of the crosslinkable semi-conductive composites were measured. The research results indicated that compared to EVA-based and EEA1-based composites, the EEA2-based composites have the lowest volume resistivity and the best rheological properties, and the CB content has less effect on their mechanical properties. The properties of the composites with CB1 were superior to that of the composites with CB2. The composites prepared with CB1 and EEA2 present the best overall properties. These composites are expected to be used in the manufacture of semi-conductive shielding layer for high voltage cable.

scholarly journals Effect of Radiation-Induced Cross-Linking on Thermal Aging Properties of Ethylene-Tetrafluoroethylene for Aircraft Cable Materials

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 257
Author(s):  
Xiaodong Zhang ◽  
Fei Chen ◽  
Zhimin Su ◽  
Taiping Xie
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Thermo Gravimetric Analysis ◽  
Thermal Characteristics ◽  
Volume Resistivity ◽  
Cross Linking ◽  
Gravimetric Analysis ◽  
Aging Properties ◽  
Radiation Induced ◽  
Ethylene Tetrafluoroethylene

The effects of electron beam irradiation on ethylene-tetrafluoroethylene copolymer (ETFE) were studied. Samples were irradiated in air at room temperature by a universal electron beam accelerator for various doses. The effect of irradiation on samples and the cross-linked ETFE after aging were investigated with respect to thermal characteristics, crystallinity, mechanical properties, and volume resistivity using thermo-gravimetric analysis (TGA), differential scanning calorimeter (DSC), universal mechanical tester, and high resistance meter. TGA showed that thermal stability of irradiated ETFE is considerably lower than that of unirradiated ETFE. DSC indicates that crystallinity is altered greatly by cross-link. The analysis of mechanical properties, fracture surface morphology, visco-elastic properties and volume resistivity certify radiation-induced cross-linking is vital to aging properties.

Polypropylene elastomer composite for the all-vanadium redox flow battery: current collector materials

2015 ◽  
Vol 3 (5) ◽  
pp. 2387-2398 ◽  
Author(s):  
Jihai Zhang ◽  
Tao Zhou ◽  
Liping Xia ◽  
Canyao Yuan ◽  
Weidong Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Current Collector ◽  
Volume Resistivity ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Good Corrosion Resistance ◽  
Low Volume ◽  
Vanadium Redox

A PP-elastomer composite for a VRB current collector was prepared, and has low volume resistivity, good mechanical properties, and good corrosion resistance.

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