Materials Literature
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Abstract Migration behaviors of antiozonants in carbon black‐filled rubber vulcanizates with different rubber compositions of natural rubber (NR), styrene–butadiene rubber (SBR), and butadiene rubber (BR) were studied at constant temperatures of 40–100°C and outdoors. Three single rubber‐based vulcanizates, three bibl…
We have studied the influence of the magnetic structure of the spacer layer on the interlayer exchange coupling and on the correlation between the coupling and magnetoresistance in MnGa-based trilayers with antiferromagnetic $({\mathrm{Mn}}_{2}\mathrm{As}),$ ferrimagnetic $({\mathrm{Mn}}_{2}\mathrm{Sb}),$ and semicond…
The effect of γ-irradiation on some physical properties of rare earth ferrite of the general formula Li 0.5 + z Co z Yb x Fe 2.5-2 z - x O 4 , ( z = 0.1, x = 0.00, 0.025, 0.050,...,0.200) was discussed. The temperature dependence of the polarization and resistance was studied in the range (300 K⩽ T ⩽700 K) at differen…
Abstract Factors—including time, temperature, morphology, and thickness of sample, the extent of silane grafting, and water concentration—that affect the rate and degree of water crosslinking reactions of the silane‐grafted LDPE are investigated. The gel content of the water‐crosslinked sample increases with increasin…
The effect of nonionic surfactants on the disproportion kinetics of copper sulfide nanoparticles (aqueous sols) from the golden brown, copper-rich phase (Q-Cu 2 S) to the green covellite phase (Q-CuS) has been presented. The transformation follows a first-order rate law. There is a substantial decrease in the rate of…
The three-dimensional structure of the lytic transglycosylase from bacteriophage lambda, also known as bacteriophage lambda lysozyme, complexed to the hexasaccharide inhibitor, hexa-N-acetylchitohexaose, has been determined by X-ray crystallography at 2.6 A resolution. The unit cell contains two molecules of the lytic…
Abstract The effect of blend ratio of natural rubber/epoxidized natural rubber (SMR L/ENR 25) and natural rubber/styrene‐butadiene rubber (SMR L/SBR) blends on scorch time ( t 2 ), cure time ( t 90 ), resilience, hardness, and fatigue properties were studied in the presence of carbon black and silica. An accelerated s…
Electrical treeing in an epoxy resin under an ac voltage for a point-to-plane gap configuration has been investigated using a phase-resolved partial discharge measurement system and shadow survey and light emission registration techniques. A self-consistent model based on the concepts of energy and electric field has…
Studies of the influences of temperature, hydrostatic pressure, dc biasing field, and frequency on the dielectric constant $({\ensuremath{\varepsilon}}^{\ensuremath{'}})$ and loss $(\mathrm{tan}\ensuremath{\delta})$ of single crystal ${[\mathrm{P}\mathrm{b}(\mathrm{Z}\mathrm{n}}_{1/3}{\mathrm{Nb}}_{2/3}{)\mathrm{O}}_{…
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Abstract A study of the dynamic complex and steady shear viscosity of isotactic polypropylene (iPP), ethylene–propylene diene terpolymer rubber (EPDM) and three different blends of both polymers are presented over a range of temperatures and frequencies. Moreover, the processability of these materials is studied throu…
Density functional supercell calculations were carried out by a mixed-basis pseudopotential method for the Σ3 (111) [1 0] symmetrical tilt grain boundary in strontium titanate, SrTiO 3 , as a prototype planar defect in an electro-ceramic material. A low grain boundary energy of 0.52 J m -2 was obtained. Minor structur…
Abstract Enzyme‐catalyzed transesterification of several cellulose solids in organic media have been investigated. Several protease enzymes were made soluble in organic media through ion‐paired enzyme–surfactant complexes. Subtilisin Carsberg was found to be catalytically active in the transesterification of cellulose…
Abstract The glass‐transition temperatures and melting behaviors of poly(ethylene terephthalate)/poly(ethylene 2,6‐naphthalate) (PET/PEN) blends were studied. Two blend systems were used for this work, with PET and PEN of different grades. It was found that T g increases almost linearly with blend composition. Both th…
The growth kinetics of a potassium sulfate crystal was investigated in the presence of traces of chromium(III) impurity (0.5 and 2 ppm) in a flow cell at different rates of change of supercooling (± 0.1 and ± 0.2 °C/min). Hysteresis in crystal growth rates with chromium(III) impurity was induced by decreasing and incr…
The concentration inside a crystalline layer was explored theoretically and experimentally for solid layer melt crystallizations. The distribution of the purity in the crystalline layer is modelled by a mass balance equation coupled with an energy balance equation. The mass balance equation is established with the com…
Abstract In this research, we used a new redox free radical initiation system consisting of potassium persulfate (K 2 S 2 O 8 ) and sodium hypophosphite (NaH 2 PO 2 ). In the presence of NaH 2 PO 2 , the thermal decomposition of K 2 S 2 O 8 is accelerated, and the temperature required for the formation of free radical…
Abstract To accomplish the stable internal plasticization of cellulose diacetate (CDA), maleic anhydride (MAH) and glycerol (Gly) were used as reactive plasticizers. The plasticization method used was based on a melt‐processing reaction of CDA with MAH and Gly. MAH and Gly (MG)‐plasticized CDA showed stiff and brittle…
Abstract This study investigates the electrical behavior, which is the positive temperature coefficient/negative temperature coefficient (PTC/NTC), and structure of polypropylene (PP)/ultrahigh molecular weight polyethylene (UHMWPE)/carbon black (CB) and PP/γ irradiated UHMWPE (XL‐UHMWPE)/CB blends. As‐received UHMWPE…
An x-ray diffraction and 31 P MAS NMR study of rare-earth phosphate glasses of composition, (R 2 O 3 ) x P 2 O 5 ) 1- x , where x = 0.175-0.263 and R = La-Er (except for Pm), is presented. The structures of these materials were investigated as a function of (a) rare-earth atomic number and (b) glass composition. The r…