Materials Literature
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We report on a temperature-dependent Raman study of terephthalidine-bis-butylaniline (TBBA) and terephthalidine-bis-heptylaniline (TB7A) in the temperature range 10-406 K and in the wavenumber regions 1120-1240 cm-1 and 1500-1700 cm-1. The variations of peak positions and linewidths of several Raman marker bands with…
The main goals of the research were to develop the new types of inexpensive reinforced polyurethane (PUR) elastomers and to study the effect of different commercial fillers on the density and mechanical properties of the developed materials. Two types of inexpensive commercial fillers based on synthetic and natural po…
Iron, aluminium and mixed iron aluminium pillared clays have been prepared by partial hydrolysis method and doped with 10% Mo. V and Cr. The samples have been characterised by XRD, FTIR and surface area and pore volume measurements. The surface acid site distribution has been determined by temperature programmed desor…
Two chiral and isomerizable liquid crystalline diacrylates were synthesized. The purpose of these compounds was to tune the helical twisting power of cholesteric materials containing these compounds by means of an E–Z photoisomerization of the photoactive group derived from stilbene. The photochemical behaviour of the…
Abstract Two series of isomeric copolyamides were synthesised, viz. polyamides 12.6 for which the adipic acid residues were partially replaced by cis / trans ‐1,4‐cyclohexanedicarboxylic acid (1,4‐CHDA), and polyamides 4.14 for which the 1,4‐diaminobutane residues were partially replaced by cis / trans ‐1,4‐diaminocyc…
When they come into contact with air, coordination compounds can often change their appearance. For instance, the colour of the compound can change as transparent crystals become opaque microcrystalline solids. This visible transformation of the compound is frequently accompanied by structural modifications due to los…
The solubility and diffusion of helium in quartz crystals are investigated as functions of the distribution and density of structural defects. The types of defects in the crystals are identified and their distribution over growth sectors is determined by x-ray diffraction topography and phase radiography with a synchr…
The symmetry groups of double-wall carbon nanotubes (DWCNs) are the line and point groups for the commensurate and incommensurate walls, respectively. For the tubes with diameters between 2.8 Å and 50 Å all possible DWCNs are found. Among them all the 318 commensurate DWCNs are singled out and their symmetry groups ar…
We have investigated the effect of carbon addition on the structure and magnetic properties of melt-spun Sm(Co 0.9 Fe 0.1 ) 6.8 Zr 0.2 C x ( x = 0, 0.03, 0.06, 0.09 and 0.12) ribbons. The samples mainly have a single TbCu 7 structure. The added carbon helps formation of a microstructure with fine and homogeneous grain…
Undercooled melt was produced in the alumina‐rich portion of the Al 2 O 3 –Y 2 O 3 system, heating the metastable eutectic structure to above the metastable eutectic temperature but below the equilibrium eutectic temperature, followed immediately by solidification along the equilibrium path in the undercooled melt. Co…
Surfaces of nano-silica particles can be effectively modified by means of irradiation graft polymerization. When polypropylene (PP) was compounded with these treated nanoparticles, an overall improvement in the mechanical properties of the composites at rather low filler content was acquired. The present work observed…
Abstract Three new extended iron‐containing heteropolytungstates were synthesized and structurally characterized: K 6 [{Fe II (H 2 O) 4 } 2 (H 2 W 12 O 42 )]·15H 2 O ( 1 ), Na 5 [{Fe(H 2 O) 3 } 2 {Fe(H 2 O) 4 } 0.5 (H 2 W 12 O 42 )]·30H 2 O ( 2 ) and (H 3 O) + 2 [{Fe(H 2 O) 4 Fe(H 2 O) 3 } 2 (H 2 W 12 O 42 )]·20H 2 O…
The effect of mimosa tannin on the electrochemical behavior of carbon steel (CS) in borate buffer solution (pH 8.4) was studied using potentiodynamic and electrochemical impedance spectroscopy techniques. Mimosa tannin was found to increase the dissolution rate of CS in the active range by forming a soluble iron(II) t…
The tensile strength and energy absorption for dissimilar metal friction welds between 6061-T6 Al alloy and type 304 stainless steel at high rates of loading were determined using the split Hopkinson bar. Cylindrical tensile specimens machined from as welded butt joints of 13 mm in diameter were used in both static an…
Abstract The application of a Monte‐Carlo (MC) algorithm to account fully for loop formation in RA 2 + R′B 3 and RA 2 + R′B 4 polymerizations is described. The resulting interpretation of experimental elastic moduli of HDI‐based polyurethane networks prepared at different dilutions shows it is essential to account for…
Abstract The goal of the investigation presented here was to evaluate the influence of semifluorinated side chains on the bulk structure and the surface properties of polysulfones with different chain structure. Thus, segmented block copolymers consisting of polysulfone and semifluorinated aromatic polyester segments…
Two series of liquid crystalline cyclic siloxane tetramers, one containing the 2-methylbutyl chiral group and the other the 1-methylheptyl chiral group, were prepared to investigate, in a systematic manner, the role of molecular structure of (a) the spacer group, (b) the mesogenic side chain and (c) the chiral end gro…
While it is acknowledged that roll wear is one of the most challenges to hot strip mills (HSM), very few studies which detail an exact prediction model have been published. The aim of this work is to evaluate and compare two prediction models with measured roll wear. The first prediction model, model 1, developed for…
Abstract A semiempirical PM3 quantum computational method has been used to generate the electronic and optimized geometrical structure of SWNT of zigzag and armchair types. We shed light on the electronic structures of SWNT with various diameters and lengths of the tube. Particularly, the calculated HOMO, LUMO and ban…
For over fifty years companies have been performing partial discharge measurements on electric equipment in order to obtain information as to the quality of insulation on operating equipment. Partial discharge activity is a well-accepted indicator of insulation deterioration. Consequently, trending of partial discharg…