Materials Literature
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Abstract Preparation of poly(butyl acrylate)‐grafted oil palm empty fruit bunch fibre (OPEFB) has been successfully carried out using H 2 O 2 /Fe 2+ as a redox initiator in aqueous solution. The effects of reaction temperature and period, as well as the amount of monomer, initiator and nitric acid, on the percentage o…
Low SF 6 content SF 6 –N 2 mixtures have recently been proposed as a replacement for pure SF 6 in the insulation of gas insulated lines (GIL). Among the areas of investigation of such gas mixtures, their electrical decomposition under corona discharges must be studied considering the possible occurrence of such stress…
Abstract This study investigated sunlight‐simulated ultraviolet (UV) beam irradiation on the tensile properties and structure of ultrahigh molecular weight polyethylene (UHMWPE) fibers. The tensile results showed that after 300 h sunlight UV irradiation, the tensile properties of the UHMWPE fibers were obviously degra…
The virial expansion of the high-frequency effective viscosity is considered for hard sphere suspensions at equilibrium. The term of the third order in volume fraction, which involves three-particle hydrodynamic interactions, is calculated with high accuracy and the corresponding coefficient in the Saitô representatio…
Abstract Isotactic polypropylene nanocomposites were obtained by the melt blending of polypropylene‐ graft ‐maleic anhydride and organophilic layered silicate (OLS) consisting of synthetic fluorohectorite modified by cation exchange with protonated octadecylamine. The composition of the inorganic clay was varied betwe…
Temperature programmed desorption of CO coadsorbed with atomic N on Rh(100), reveals both long- and short-range interactions between adsorbed CO and N. For CO desorption from Rh(100) at low coverage we find an activation energy Ea of 137±2 kJ/mol and a preexponential factor of 1013.8±0.2 s−1. Coadsorption with N parti…
Abstract The heat capacity or reversing heat flow signal from modulated‐temperature differential scanning calorimetry can be used to measure the onset of phase separation in a poly(vinylmethylether)/water mixture, clearly showing the special type III lower critical solution temperature demixing behavior. Characteristi…
The dielectric relaxation strength, ΔεJG, the relaxation rate, fm,JG and the distribution parameter, αJG, of the faster relaxation process in D-sorbitol have been studied as a function of temperature and the cooling rate. Amongst these, fm,JG and αJG of the glass and the supercooled liquid change smoothly with the tem…
The phase evolution and magnetic properties of Pr2Fe23B3 and Pr2(Fe0.975Ti0.025)23B3 melt-spun ribbons have been investigated. For Pr2Fe23B3 spun at 25 m/s, the magnetically hard Pr2Fe14B phase coexists with α-Fe, Pr2Fe23B3, and Fe3B when annealed at temperatures above 700 °C, while merely two phases, namely, Pr2Fe14B…
Effects of uniaxial stress on the dielectric properties of ceramics in lead magnesium niobate–lead zirconate titanate (PMN–PZT) system are investigated. The ceramics with a formula ( x )Pb(Mg 1/3 Nb 2/3 )O 3 –(1− x )Pb(Zr 0.52 Ti 0.48 )O 3 or ( x )PMN–(1 − x )PZT when x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0 are prep…
Ferroelectric Pb(Zr0.52Ti0.48)O3 (PZT) films were prepared by a modified sol-gel process, in which polyethylene glycol (PEG) was added to the precursor solutions. An x-ray diffraction (XRD) method that detected the d(123) variation associated with the change in the incline angle ψ of the plane (123) was developed to q…
The phase diagram of the double perovskites of the type ${\mathrm{Sr}}_{2\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{FeMoO}}_{6}$ is analyzed, with and without disorder due to antisites. In addition to an homogeneous half metallic ferrimagnetic phase in the absence of doping and disorder, we find antiferromagnetic phase…
A high-performance electro-optic (EO) polymer modulator on a flexible substrate was fabricated using a polymer substrate layer lift-off method. The SU-8 polymer has widely different adhesion properties on Si and gold substrates that makes selective lift-off possible. The flexible EO polymer modulators on a 100-μm poly…
An anhydrous route for the synthesis of amine-capped coinage-metal nanoparticles (NP) has been developed using coinage-metal mesityl (mesityl = 2,4,6-Me 3 C 6 H 2 ) derivatives. Under an argon atmosphere, crystalline [Cu(μ-mesityl)] 5, [Ag(μ-mesityl)] 4, and [Au(μ-mesityl)] 5 were readily dissolved in octylamine (0.3…
Abstract Experimental solution intrinsic viscosity responses to temperature and polymer molecular weight variations were used to test the modeling capability of a simplified intrinsic viscosity equation. The multiple linear equation contains three parameters that are related to the thermodynamic properties of a polyme…
Abstract Some of the main factors affecting the small‐scale melt spinning of poly(ε‐caprolactone), PCL, monofilament fibres have been studied. These factors included spinning temperature, extrusion rate, take‐up rate and draw ratio. The underlying influence of the polymer's own characteristic properties, in particular…
Abstract Organo‐montmorillonite/nitrile rubber (NBR) nanocomposites were prepared by a melt intercalation process. The characteristics of NBR nanocomposites were determined by an oscillating disk rheometer and transmission electron microscopy. The cure characteristics were investigated according to the change in clay…
Abstract In the present study, a series of branched and partially crosslinked poly(ethylene terephthalate) (PET) samples were prepared by the two‐stage melt polycondensation method, using different amounts of trimethyl trimellitate (TMT) as polyfunctional monomer. The samples were characterised with respect to intrins…
Abstract Composites of poly(propylene carbonate) (PPC) reinforced with micrometric and nanometric calcium carbonate particles were prepared via melt mixing followed by compression molding. The morphology and mechanical and thermal behaviors of the composites were investigated. Static tensile tests showed that the tens…
The heat-treatment effect on electronic properties is investigated in relation to structural change for pulsed-laser-deposited amorphous carbon thin films having ${\mathrm{sp}}^{2}{/sp}^{3}$ ratio $\ensuremath{\approx}9.$ The heat treatment at temperatures 200--400 $\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ incre…