Electrical Resistivity and Flexural Strength of Plastic Composites Reinforced with Pineapple Leaf Particles

2011 ◽  
Vol 8 (2) ◽  
pp. 1
Author(s):  
Masitah Abu Kassim ◽  
Shahril Anuar Bahari ◽  
Mohd Khairi Yahya ◽  
Khairul Safuan Muhammad ◽  
Rahimi Baharom
Keyword(s):  
Electrical Resistivity ◽  
Flexural Strength ◽  
Electrical Resistance ◽  
Physical Contact ◽  
Matrix Stiffness ◽  
Plastic Composites ◽  
Particle Ratios ◽  
Plastic Materials ◽  
The Matrix ◽  
Plastic Matrix

The electrical resistivity and flexural strength of plastic composites reinforced with pineapple leaf particles (PCPLP) is presented. PCPLP were produced using different plastic materials; Polyethylene (PE) and Polypropylene (PP), and different plastic-pineapple leaf particle ratios; 50:50 and 70:30. The PCPLP were tested and evaluated with respect to electrical resistivity and flexural strength according to ASTM D257 and D790, respectively. The results indicate that PCPLP made from PP exhibits better electrical resistance than PE, which may be attributed to the better frequency insulation behaviour of PP. PCPLP using the higher ratio of 70:30 also exhibited better electrical resistance than the lower 50:50 ratio. Cellulose materials inherently influence the electrical resistance of plastic composites, due to their natural propensity to absorb moisture. The PCPLP produced using a ratio of 50:50 for both PP and PE composites exhibited better MOE results than the 70:30 composites, however the converse is true with respect to the MOR. MOE of PCPLP was increased with increasing pineapple leaf particles content due to the greater matrix stiffness of this natural particle with respect to plastic matrix. However, high percentage of filler particles in the matrix (70:30 ratio) has reduced the toughness in the composite structure due to the lost of physical contact between high accumulated particles.

Study on Application of Modified Polyethylene in Preparation of Wood-Plastic Composites

2010 ◽  
Vol 150-151 ◽  
pp. 379-385
Author(s):  
Qun Lü ◽  
Qing Feng Zhang ◽  
Hai Ke Feng ◽  
Guo Qiao Lai
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Flexural Strength ◽  
High Density Polyethylene ◽  
Wood Flour ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
The Matrix ◽  
The Impact

The wood-plastic composites (WPC) were prepared via compress molding by using the blends of high density polyethylene (HDPE) and modified polyethylene (MAPE) as the matrix and wood flour (WF) as filler. The effect of MAPE content in the matrix on the mechanical properties of the matrix and WPC was investigated. It was shown that the change of MAPE content in the matrix had no influence on the tensile strength of the matrix, but markedly reduced the impact strength of the matrix. Additionally, it had significant influence on the strength of WPC. When the content of wood flour and the content of the matrix remained fixed, with increasing the content of MAPE in the matrix, the tensile strength and the flexural strength of WPC tended to increase rapidly initially and then become steady. Moreover, with the increasing of MAPE concentration, the impact strength of WPC decreased when the low content of wood flour (30%) was filled, but increased at high wood flour loading (70%).

scholarly journals Identification of topography of surfaces created by turning biomaterials with optical profilometry

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 2483-2494
Author(s):  
Zuzana Mitaľová ◽  
Dušan Mitaľ ◽  
František Botko ◽  
Juliána Litecká ◽  
Jozef Zajac ◽  
...  
Keyword(s):  
Surface Characteristic ◽  
Tool Geometry ◽  
Contact Method ◽  
Initial Material ◽  
Optical Profilometry ◽  
Plastic Composites ◽  
The Matrix ◽  
Optical Profilometer ◽  
Surface Monitoring ◽  
Plastic Matrix

This study deals with the identification of the topography of the surface that is created by machining composite materials with natural fibres (biomaterials, wood-plastic composites – a material with plastic matrix and natural reinforcement). The final surface was evaluated based on tool geometry (turning technology), and the influence of the tool on selected evaluating parameters of the obtained surface was evaluated using a non-contact method, applying an optical profilometer (MicroProf FRT). After machining the surface, characteristic relief (a trace on the surface of the material) was visible depending on the machining factors combination (machine, tool, workpiece, and fixture). The initial material also played a prominent role in the surface monitoring, in relationship to the composition of the material and the interaction between the matrix and reinforcement, i.e., detection of defects in the area of the interaction between the initial components.

scholarly journals Silver Particles on the Thermal and Electrical Characteristics of ECAs

2019 ◽  
Vol 8 (3S3) ◽  
pp. 536-542
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Weight Ratio ◽  
Nano Particles ◽  
Electrical Characteristics ◽  
Electrically Conductive ◽  
Particle Ratios ◽  
Electrically Conductive Adhesive ◽  
The Matrix ◽  
Ag Particle

This study presents information on the thermal and electrical characteristics of silver (Ag) in range size of 2–3.5 μm and 80 nm in diameter. The present method demonstrates the thermal conductivity analysis and electrical resistivity influence by various particle content of Ag in Epoxy matrix for both micro and nano-sized. Furthermore, new technique of thermal properties and electrical resistivity observation is proposed by hybrid-sized analysis to characterize the effect of Ag size. The proposed hybrid-sized technique uses micro- and nano-sized particle ratios to generate the composite. The thermal and electrical resistivity characteristics of the epoxy composite-filled micro-, nano-, and hybrid-sized Ag particle are correlated with their morphology. The thermal conductivity of the electrically conductive adhesive sample is affected by Ag particle size. The micro-sized Ag particle is better filler than the nano-size Ag particle in increasing performance of the thermal conductivity in the matrix epoxy. The results of the electrical resistivity of micro- and nano-particles demonstrated similar characteristics that transition within insulator into conduction occurred at 6 vol%. While hybrid-sized systems shown decreasing in thermal conductivity performance when decreasing number micro-sized ratio. Other observation in hybrid-sized presented that the better performance of electrical conductivity has shown at 50:50 weight ratio.

scholarly journals Влияние углерода на электрические свойства объемных композитов на основе окиси меди

2018 ◽  
Vol 60 (4) ◽  
pp. 677
Author(s):  
Ю.Е. Калинин ◽  
М.А. Каширин ◽  
В.А. Макагонов ◽  
С.Ю. Панков ◽  
А.В. Ситников
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistance ◽  
Low Temperatures ◽  
Ceramic Technology ◽  
Localized States ◽  
Filler Concentration ◽  
Schematic Model ◽  
Carbon Filler ◽  
The Matrix ◽  
Temperature Dependences

AbstractThe effect of carbon filler on the electrical resistance and the thermopower of copper oxide-based composites produced by ceramic technology by hot pressing has been studied. It is found that the dependences of the electrical resistivity on the filler concentration are characteristic by S-like curves that are typical of percolation systems; in this case, the resistivity decreases more substantially as the carbon content increases as compared to the decrease in thermopower value, which is accompanied by the existence of the maximum of the factor of thermoelectric power near the percolation threshold. The studies of the temperature dependences of the resistivity and the thermopower at low temperatures show that, in the range 240–300 K, the predominant mechanism of the electrotransfer of all the composites under study is the hopping mechanism. At temperatures lower than 240 K, the composites with a nanocrystalline CuO matrix have a hopping conductivity with a variable hopping distance over localized states of the matrix near the Fermi level, which is related to the conductivity over intergrain CuO boundaries. A schematic model of the band structure of nanocrystalline CuO with carbon filler is proposed on the base of the analysis of the found experimental regularities of the electrotransfer.

Development of bamboo polymer composites with improved impact resistance

2021 ◽  
pp. 096739112110093
Author(s):  
RM Abhilash ◽  
GS Venkatesh ◽  
Shakti Singh Chauhan
Keyword(s):  
Impact Strength ◽  
Flexural Strength ◽  
Polymer Composites ◽  
Impact Resistance ◽  
Adverse Impact ◽  
Matrix Polymer ◽  
Bamboo Fibre ◽  
The Matrix ◽  
Major Criterion ◽  
Pp Composites

Reinforcing thermoplastic polymers with natural fibres tends to improve tensile and flexural strength but adversely affect elongation and impact strength. This limits the application of such composites where toughness is a major criterion. In the present work, bamboo fibre reinforced polypropylene (PP) composites were prepared with bamboo fibre content varying from 30% to 50% with improved impact resistance. Homopolymer and copolymer PP were used as the matrix polymer and an elastomer was used (10% by wt.) as an additive in the formulation. Copolymer based composites exhibited superior elongation and impact strength as compared to homopolymer based composites. The adverse impact of elastomer on tensile and flexural strength was more pronounced in homopolymer based composites. The study suggested that the properties of the bamboo composites can be tailored to suit different applications by varying reinforcement and elastomer percentage.

The Effect of Modifier on Properties of Bamboo Powder/High-Density Polyethylene Composites

2019 ◽  
Vol 69 (4) ◽  
pp. 313-321
Author(s):  
Xiaoxia Hu ◽  
Zhenghao Chen ◽  
Yang Cao ◽  
Zhangjing Chen ◽  
Shuangbao Zhang ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Dry Weight ◽  
Weight Percent ◽  
Sem Analysis ◽  
High Density ◽  
Hydroxyl Groups ◽  
Plastic Composites ◽  
Bamboo Powder ◽  
Plastic Matrix ◽  
Polyethylene Composites

Abstract The focus of this study was to observe the properties of bamboo plastic composites modified with a self-made modifier, 18 acyl-dopamine (0, 0.25, 0.50, 0.75, 1.00, and 1.25 weight percent [wt%] based on the dry weight of bamboo powder). The effects of the modifier were demonstrated by measures of mechanical properties, water absorption, thermal stability, and scanning electron microscopy (SEM). The results revealed that 18 acyl-dopamine could be used as an effective modifier of bamboo powder/high-density polyethylene composites. When the modifier was increased, the toughness of the composite deteriorated, and the strength and rigidity improved. This indicated that when the dosage became higher, the compatibilization became stronger, and the toughening effect became worse. Based on the experimental data, a small dosage modifier acted as a toughening agent; as the dosage increased to 1.0 wt%, the compatibility began to appear. The modifier reacted with the hydroxyl groups on the surface of the bamboo powder, which caused the bamboo powder to absorb less water, so the thickness expansion rate was lowest at 1.25 wt%. The pyrolysis peak of bamboo powder and plastic showed a tendency to be close to each other, indicating that the interface was improving. Based on the equation of Flynn-Wall-Ozawa, as the dosage of the modifier increased from 0.50 to 1.25 wt%, the apparent activation energy also increased. The SEM analysis showed the binding between bamboo powder and the plastic matrix was strongest when the modifier dosage was 1.25 wt%.

scholarly journals The Matrix Stiffness Regulates Morphology, Direction and Persistence of Motiles Cells

2013 ◽  
Vol 104 (2) ◽  
pp. 148a
Author(s):  
Maryam Riaz ◽  
Marie Versaevel ◽  
Sylvain Gabriele
Keyword(s):  
Matrix Stiffness ◽  
The Matrix

LOW TEMPERATURE RESISTIVITY OF TRANSITION ELEMENTS: VANADIUM, NIOBIUM, AND HAFNIUM

1957 ◽  
Vol 35 (8) ◽  
pp. 892-900 ◽  
Author(s):  
G. K. White ◽  
S. B. Woods
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Electrical Resistance ◽  
Thermal Resistivity ◽  
Superconducting Transition ◽  
Transition Elements ◽  
Pure Niobium ◽  
Temperature Resistivity ◽  
The Ideal

Measurements of the thermal conductivity from 2° to 90 ° K. and electrical conductivity from 2° to 300 ° K. are reported for vanadium, niobium, and hafnium. Although the vanadium and hafnium are not as pure as we might wish, measurements on these metals and on niobium allow a tabulation of the "ideal" electrical resistivity clue to thermal scattering for these elements from 300 ° K. down to about 20 ° K. Ice-point values of the "ideal" electrical resistivity are 18.3 μΩ-cm. for vanadium, 13.5 μΩ-cm. for niobium, and 29.4 μΩ-cm. for hafnium. Values for the "ideal" thermal resistivity of vanadium and niobium are deduced from the experimental results although for vanadium and more particularly for hafnium, higher purity specimens are required before a very reliable study of "ideal" thermal resistivity can be made. For the highly ductile pure niobium, the superconducting transition temperature, as determined from electrical resistance, appears to be close to 9.2 ° K.

Characterization of the SiCf/SiC Composite Fabricated by the Whisker Growing Assisted CVI Process

2005 ◽  
Vol 287 ◽  
pp. 200-205 ◽  
Author(s):  
Ji Yeon Park ◽  
S.M. Kang ◽  
Weon Ju Kim ◽  
Woo Seog Ryu
Keyword(s):  
Flexural Strength ◽  
Chemical Vapor ◽  
Pyrolytic Carbon ◽  
Chemical Vapor Infiltration ◽  
Interlayer Thickness ◽  
Filling Time ◽  
The Matrix ◽  
Sic Whiskers

To obtain a dense SiCf/SiC composite by the chemical vapor infiltration (CVI) process, whisker growing before matrix filling was applied, which is called the whisker growing assisted CVI process. The whisker growing and matrix filling processes were carried out using MTS (CH3SiCl3) and H2 as source and diluent gases, respectively. Tyranno-SATM was used as a reinforced substrate. Characterizations of SiC whisker grown during the in situ whisker growing process have been investigated. The weight gain rates with the matrix filling time and the density of composites was measured. The flexural strength with the thickness of the pyrolytic carbon (PyC) interlayers has been evaluated. b-SiC whiskers with many stacking faults were grown well in the Tyranno SATM fabrics. Tyranno-SA/SiC composite with a PyC interlayer thickness of 150 nm had a flexural strength of 610 MPa and the density of 2.71 g/cm3.

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