Materials Literature
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Abstract A method has been developed for measuring infrared spectra during the mechanical deformation of yarns. This rheooptical technique was applied to study the molecular processes that take place along the stress‐strain curve of PET yarns. The results were combined with data obtained from size exclusion chromatogr…
Abstract Polymer blends of poly(ethylene terephthalate) (PET) and polystyrene (PS) are immiscible and incompatible, which has been well recognized. Styrene–glycidyl methacrylate (SG) copolymer has been synthesized by suspension polymerization and employed in this study as an in situ compatibilizer for the polyblends o…
Abstract Acrylonitrile (AN) was copolymerized with acrylic acid (AA), methacrylic acid (MAA), and itaconic acid (IA) by the aqueous suspension method at 40°C with ammonium persulfate and sodium metabisulfite as the redox initiator. The reactivity ratios for the AN–AA and AN–IA systems were also calculated by the Finem…
Transition state theory is frequently used to describe interstitial diffusion in solids. A basic assumption in this theory is that equilibrium statistical mechanics can be used to characterize the different configurations in the transition state, the region in configuration space which acts as a bottleneck for the mot…
We have observed up to 8 orders (n) in the spectra of parametric x-radiation (PXR) in the range 5--40 keV, produced by the interaction of a 90 MeV electron beam with mosaic graphite and single silicon crystals. The measured yields and intensity ratios, I(n\ensuremath{\ge}2)/I(n=1), in graphite are not in agreement wit…
Using synchrotron radiation and an imaging plate the authors have performed a high-angular-resolution powder X-ray diffraction study of the 'distorted FCC' high-pressure phase of praseodymium. The crystal structure of this phase is identified as the trigonal space group R3m (D 3d 5 ) with eight atoms in the rhombohedr…
We have investigated the transverse and longitudinal electro-optic properties of epitaxial single crystalline lead lanthanum zirconate titanate ferroelectric thin films grown by pulsed laser deposition on [100] silicon and MgAl2O4 substrates. With the electric field applied in a longitudinal geometry, we measure biref…
The possibility of varying the compositional long-range order parameter s and the influence of s on the ferroelectric properties of pure and Li-doped Pb(Yb 0.5 Nb 0.5 )O 3 ceramics have been studied. X-ray diffraction and dielectric measurements were used. A compositional order-disorder phase transition was discovered…
A novel mechanism is proposed for efficient manipulation of transport forces acting on the droplets during spray pyrolytic deposition of thin films. A ‘‘burst mode’’ technique of spraying is used to adjust the deposition conditions so as to transport the droplets under the new mechanism. Transparent, conducting thin f…
We propose an explanation for the experimentally observed transition in the shape of silicon clusters of size 20\ensuremath{\le}N\ensuremath{\le}40: Elongated shapes of low energy can be obtained by stacking stable subunits, while concurrent optimization of surface-to-volume ratio and surface structure leads to compac…
Article X-ray and electron diffraction investigations on the stable decagonal phase in Co — Ni — Al alloys was published on August 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 205, issue 1-2).
This study examined how fibre and fabric properties affect the drying time of a wide range of textile materials. It was found that the drying time of a fabric is independent of its fibre type and thus regain, but dependent on the amount of water initially in the fabric which depends to a great extent on the thickness…
Based on the dynamic bond percolation model, we try to regenerate the non-Arrhenius temperature dependence for the ionic conductivity of the polyethylene oxide type polymer electrolytes by considering continuous, correlated motions of the host polymer matrix. To simulate the chain movements, periodic rotations of bond…
The N-methylated and/or N-ethylated I− and BF4- salts of 2-(3-pyridyl)- (2(m)) and 2-(4-pyridyl)-4,4,5,5-tetramethyl-nitronylnitroxides (2(p)), and 2-(4-pyridyl)-4,4,5,5-tetramethyl-imidazolin-1-oxyl (3(p)), and also the radical cation/radical anion salts obtained by the exchange reaction of I− and BF4- in the above r…
Graded DLC based coatings and multilayers for wear resistance applications have been produced using a novel hybrid unbalanced magnetron sputtering/ low pressure CVD System. The main features of this highly flexible and scalable process are discussed. These films have been characterised using a variety of techniques in…
The theory of polarizable anisotropic fluids is developed on the basis of a model fluid consisting of anisotropic Drude oscillators with embedded permanent dipoles. A matrix theory is developed. The dielectric tensor is derived and a matrix Monte Carlo method is used to calculate the optical absorption and birefringen…
The multiple reflection method of Schmidt [Ann. Phys. (Leipzig) 23, 671 (1907)] has been developed to study the general case of backscattering of electrons from multilayers. Exact expressions have been given for the absorption, backscattering, and transmission of electrons impinging on multilayers which reduce to prev…
Abstract The effect of aluminium hydroxide particle size and shape has been investigated on the performance of (polymethyl methacrylate) composites in a number of flammability tests. As a subsidiary exercise correlation between the tests has been investigated. The work has shown the expected effect of particle size on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel two-step synthesis of poly(benzothiazoles) via new precursor polyamides from 2,5-bis[(cyanoethyl)thio]-1,4-phenylenediamine and aromatic dicarboxylic acid chloridesTatsuya Hattori, Kazuhiro Kagawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1993, 26, 16…
Coatings of carbon-boron-nitrogen compounds with various compositions are obtained in a low pressure chemical vapour deposition process using acetylene, boron trichloride, ammonia and hydrogen as input gases. Compositions are located in the ternary system C-BN-"BC3". The structure of the films is a graphitic turbostra…