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Article
Average gap distance between adjacent conductive fillers in polyimide matrix calculated using impedance extrapolated to zero frequency in terms of a thermal fluctuation-induced tunneling effect
Temperature dependence of conductivity of polymer composites was analyzed using the DC component (frequency → 0 Hz) of AC conductivity in terms of thermal fluctuation-induced tunneling through thin barriers to...
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Article
Preparation of activated ceria and its desulfurization performance
Activated ceria (CeO2/γ-Al2O3) prepared by impregnation was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and hydrogen temperature-programmed reduction (TPR). The desulfurization o...
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Article
Gelation/crystallization mechanisms of UHMWPE solutions and structures of ultradrawn gel films
The gelation mechanisms of ultra-high-molecular-weight polyethylene (UHMWPE) chains differed significantly in decalin and paraffin, although these are typical solvents used to gel spin UHMWPE fibers with high ...
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Article
Evaluation by tunneling effect for the temperature-dependent electric conductivity of polymer-carbon fiber composites with visco-elastic properties
The conductivity of composites with a carbon fiber (CF) content slightly higher than the percolation threshold was measured at increasing temperatures up to −10 °C. The tunneling effect was theoretically calcu...
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Article
Morphological, Electrical and Mechanical Properties of Ultrahigh Molecular Weight Polyethylene and Multi-wall Carbon Nanotube Composites Prepared in Decalin and Paraffin
Ultrahigh molecular weight polyethylene (UHMWPE) and multi-wall carbon nanotube (MWNT) composites were prepared using either decalin or paraffin as solvent. Electrical conductivity measurements were performed ...
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Article
Structural Changes of Polyacrylonitrile Film by Catalytic Effects of Nickel Particles under Carbonization Process
Structural changes of polyacrylonitrile (PAN) film, prepared by gelation/crystallization from solutions, were studied by the effect of nickel particles on the carbonization at various temperatures under argon ...
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Article
High Modulus and High Strength Fibers with High Electric Conductivity Prepared by Copper Electroless Plating on the Surface of Poly(p-phenylenebenzobisoxazole) (PBO)
In attempt to produce high modulus and high strength fibers with high electric conductivity, copper plating on the surface of poly(p-phenylenebenzobisoxazole) (PBO) fiber was carried out by using electroless plat...
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Article
Thermal, Electrical and Mechanical Properties of Ultra-high Molecular Weight Polypropylene and Carbon Filler Composites
Isotactic ultra-high molecule weight polypropylene (UHMWPP) composites filled with multi-wall carbon nanotubes (MWNTs), vapor growth carbon fibers (VGCFs) and short carbon fibers (CFs) were prepared by gelatio...
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Article
Segmental Orientation under Simultaneous Biaxially Stretching Using a Lattice Model and the Application of Oriented Crystallization of Polyethylene Films
A lattice model proposed before for uniaxial stretching of polyethylene films was applied to estimate the oriented crystallization of ultra-high molecular weight polyethylene (UHMWPE) dry gel films under simul...
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Article
Mechanical Properties of Poly(ethylene terephthalate) Estimated in Terms of Orientation Distribution of Crystallites and Amorphous Chain Segments under Simultaneous Biaxially Stretching
Young’s modulus of poly(ethylene terephthalate) (PET) film was estimated by using the generalized orientation factors of crystallites and amorphous chain segments calculated from the orientation functions of c...
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Article
Orientation Distribution Functions of the Three Principal Crystallographic Axes as well as Crystallites of Poly(ethylene terephthalate) Films under Biaxially Stretching
The orientation of the three principal crystallographic axes, the a-, b-, and c-axes of crystallites of poly(ethylene terephthalate) (PET) under simultaneous biaxial stretching was estimated in terms of the orien...
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Article
Biodegradation of Biaxially Stretched Polyethylene-Starch Composite Films
The biodegradation of biaxially stretched composite films were investigated by using ultra-high molecular weight polyethylene (UHMWPE) with viscosity average molecular weight of 6×106 and starch. The films were p...
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Article
Morphology and Orientation of Crystallites of Simultaneous Biaxially Stretching Ultra-High Molecular Weight Polyethylene Films Prepared by Gelation/Crystallization from Solutions
Simultaneous biaxially stretching was carried out using ultra-high molecular weight polyethylene dry gel films which were prepared by crystallization from solutions. The concentrations were 0.45, 0.5, 0.6, 0.7...