Materials Literature
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The aim of the study was to investigate the synthesis of a copolymer bearing cyclic carbonate and its miscibility with styrene/acrylonitrile copolymer (SAN) or poly(vinyl chloride) (PVC). (2-Oxo-1,3-dioxolan-4-yl)methyl vinyl ether (OVE) as a monomer was synthesized from glycidyl vinyl ether and CO2 using quaternary a…
The origin of the gel formation during the conversion of poly(amic acid)s to polyisoimides, and methods for its prevention are described. The gelation behaviour was studied as a function of the cyclodehydration temperature, the concentration and end-groups of 4,4′-oxydianiline/4,4′-oxydiphthalic anhydride poly(amic ac…
This paper deals with the performance of alumina bearing sol, prepared through sol-gel route, when used as a bonding agent in low cement refractory castable composition. The physical properties of the samples prepared by different processing technique (tapping and vibration) are compared. The results indicate that the…
The model of nonlinear equations for solidification in the presence of a quasiequilibrium mushy gone is solved analytically. Concentration, temperature fields, bulk fraction of the solid phase in the mushy zone, and the mushy region width are found theoretically.
Magnetic domain structures of Nd2Fe14B based permanent magnets were studied by using electron holography and Lorentz microscopy. In a sintered Nd2Fe14B permanent magnet, a domain wall width of a 180° magnetic domain was evaluated to be 5.1 nm by Lorentz microscopy, while the magnetization distribution in the 90° magne…
With an extended Su–Schrieffer–Heeger Hamiltonian including Hubbard energy and intersite Coulomb repulsion, we study the effects of two kinds of boundary conditions on the spin configuration and lattice distortion in organic ferromagnetic polymers with interchain coupling. It is shown that if the length L of the latti…
Thermal degradation of two series of polyacrylates containing long fluorocarbon chains [abbr.: PFnA {HCF2(CF2)n−1 CH2OC(O), n = 4, 6, 8, 10} and abbr.: PFFnEA {CF3(CF2)n−1 CH2CH2OC(O), n = 6, 8, 10}] was investigated by TG /FTIR. Thermal degradation behavior of polymers changed depending on the type of tie g…
New copoly(aryl ether ketone)s have been synthesized by polycondensation of 2,2′,3,3′,6,6′-hexaphenyl-4,4′-diphenol, 2,2′-p-hydroxyphenyl-iso-propane, and 4,4′-difluorobenzophenone. The technology of 13C-NMR was used to determine contents of the two bisphenols in the copolymers. Chain structure was characterized by il…
The Fourier transform infrared (FfIR) and Raman spectra of gypsum (CaS04'2H20) and barite (BaS04) from various localities in Macedonia were studied. Contrary to the group-theoretical predictions, it was found that the band originating from the V2 sulfate mode (expected at around 450 cm-I) does not appear in the infra…
Niosomes or non-ionic surfactants vesicles are microscopic lamellar structures formed on the admixture of a non-ionic surfactant, cholesterol and phosphate with subsequent hydration in aqueous media. The delivery of drugs by “vesicular drug delivery system” such as niosomes provides several important advantages over c…
The abilities of four chelators to separate bast fibers of non-retted oilseed flax from each other and the core and cuticle have been investigated at different pH level. EDTAand DTPA separate fiber ...
We study the domain structure in ferroelectric thin films with a ‘passive’ layer (material with damaged ferroelectric properties) at the interface between the film and electrodes within a continuous medium approximation. An abrupt transition from a monodomain to a polydomain state has been found with the increase of t…
This Paper describes the modified HDPE (into which a small amount of acid group is grafted as modified group) insulated cable as a high performance HVDC polymer cable. It has been confirmed that the high performance DC and impulse breakdown strength of modified HDPE results from the two aspects : (1) the improvement i…
number: 262 ABSTRACT In the Japan Power Demonstration Reactor decommissioning program remote handling technologies were developed that could be successfully applied to dismantling the core components and verified by successful work accomplishment. However, wider applications and intelligence to the work process were r…
We have measured contact angles for a range of pure oils of different cohesive energy density and surfactant solutions in oil on polyethylene (PE) and polytetrafluoroethylene (PTFE) solid surfaces. For the pure oils, the measured contact angles are in approximate agreement with values calculated using dispersion force…
The extended cantilever model (ECM) for transformer or inductor windings is convenient from the parameter extraction standpoint since, theoretically, each model parameter can be extracted from a single measurement of an open-circuit voltage or a short-circuit current. The impedance of the sensor used to measure a shor…
In this work, pressure-thickness relation is investigated for a series of plain and rib knitted structures made from cashmere and polyester textured (PET) yarns. The pressure-thickness curve during lateral compression is divided into three regions, namely, the first linear region followed by the non-linear region and…
Zero NOx emissions are obtained in the catalytic combustion of simulated biomass mixtures containing substantial amounts of ammonia by optimisation of NH3 oxidation and NOx reduction using a 2%Rh–Al2O3 catalyst.
A series of acid catalysts was prepared by heating of NH 4 -saturated montmorillonite at 200-600 °C for 24 h. Their catalytic activity was tested in acetylation of 3,4,5-trimethoxybenzaldehyde with acetic anhydride. This reaction is sufficiently sensitive to modification of the catalyst and thus suitable for testing c…
We analyze dielectric data obtained on PZT-5A samples which had been electrically deaged in a well defined way. Thus the exponent a of the power law characterizing the ac-field dependence of the effective dielectric coefficient ϵ11* could be determined with high accuracy. The result α′=1.10(1) and α″= 1.07(1) obtained…