Materials Literature
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The first example of an enzyme catalysed modification of the backbone of a synthetic polymer is described. An immobilised lipase from Candida antarctica (Novozym 435) catalyses the selective epoxidation of polybutadiene in organic solvents in the presence of hydrogen peroxide and catalytic quantities of acetic acid. T…
The corrosion rate of gas condensate pipelines can be substantially reduced by increasing the pH artificially. The technique is called pH stabilization and has been used with success in gas condensate pipelines. The reduction is based on the precipitation of protective corrosion products on the steel surface. When cor…
The recent attempt to account for the existence of several magnetic phases in insulating perovskite manganites in terms of the interplay between the orbital and spin orders produced by the localized e g and t 2g electrons is extended to the metallic state which is obtained on doping. It is shown that the activation en…
The effect of adding silica to rubber compound on its adhesion to brass-plated steel cord was investigated. Silica reduced the curing rate and enhanced the physical properties of the rubber compound, especially after thermal aging, when 20 phr of silica was added. The pull-out force increased considerably with silica…
The question on the dominant driving mechanism (displacive or order-disorder) at each structural phase transition of KNbO3 is investigated by means of molecular dynamics simulations. To this purpose, we first develop a shell model by determining its potential parameters in order to reproduce the ferroelectric instabil…
A model of relaxation in supercooled and entangled polymer liquids is developed starting from an integral equation describing relaxation in liquids near thermal equilibrium and probabilistic modelling of the dynamic heterogeneity presumed to occur in these complex fluids. The treatment of stress relaxation considers t…
Abstract The crystal structures of synthetic KSb 5 S 8 and (Tl 0.598 , K 0.402 )Sb 5 S 8 were determined from single crystal X-ray diffraction data: space group Pn , Z = 4, a = 8.1374(5) Å, b = 19.5013(5) Å, c = 9.0620(6) Å, β = 91.932(5)° ( R = 4.11% for 5073 reflections), and a = 8.1148(9) Å, b = 19.425(3) Å, c = 9.…
Article Influence of Ti Substitution on the 29Si NMR Spectra of Silicalite. A Computational Study was published on January 1, 1999 in the journal Zeitschrift für Physikalische Chemie (volume 209, issue 1).
Among many attractive effects on physicochemical processes; one of the most promising applications of power ultrasound concerns crystallization. This paper is a review of the previous work on sonocrystallization. Ultrasound has been used in crystallization to initiate primary nucleation by narrowing the metastable zon…
One of the parameters used to characterize the partial discharge (PD) behavior is its inception voltage. The partial discharge inception voltage (PDIV) should always be higher than the operating voltage to ensure that PD does not occur at or near operating voltage. Under these circumstances, other PD parameters such a…
Sets of pressurized tubes constructed from a combination of three lots of HT9 and two heat-treatments were examined after irradiation in FFTF-MOTA at four different temperatures between 400 and 600°C. Diametral measurements indicated that small amounts of swelling occurred at 400°C, with the magnitude of the swelling…
Five new glycosides of 14,15-seco- and 13,14:15-diseco-type pregnanes, including a new pregnane, 2 alpha-hydroxyhirundigenin, were isolated, in addition to one known glycoside, cynatratoside B, from the roots of Tylophora tanakae Maxim. Their structures were elucidated by spectral and chemical means.
The basic loss and recovery mechanisms of composite insulator hydrophobicity are described. Two typical silicone systems, room temperature vulcanizing silicone rubber (RTV) and liquid silicone rubber (LSR) used for high voltage sheds are analysed concerning their LMW contents and quality. The hydrophobicity transfer o…
This is the first of a series of research papers featuring structure-property relationships in UK-grown natural cellulosic fibres, a renewable resource which may be extracted from the stems of plant fibres. They are composed of cellulose, hemicellulose, and lignin, together with other constituents, and, unlike seed ha…
The effect of blending tricalcium phosphate (TCP) on hydrolytic degradation of a new type of poly(L-lactic acid)/poly(ethylene:hexamethylene/sebacate) block polyester (60: 40 wt%) was studied. 100- and 250-microm film specimens blended with 0, 10, and 30 wt% TCP were immersed in phosphate buffered saline (pH 7.4) at 3…
Spectra and temperature dependent decay rates of emission from [Mn(15-crown-5)(H2O)2]2+ ions anchored by a network of O–H‥Br‥H–O bonds in two- and one-dimensional supramolecular arrays of {[Mn(15-crown-5)(H2O)2][TlBr5]}n 1 and {[Mn(15-crown-5)(H2O)2]Br2}n 2 demonstrate the potential efficacy of manganese(II) ions as l…
The 13C-{1H}NMR spectra of two monofluorinated nematic liquid crystals, I35 and I52, have been obtained and analysed to yield sets of dipolar couplings, DiF, from each carbon in the molecule to the fluorine nucleus. The couplings involving carbons in the fluorinated biphenyl group are used, together with a mean field…
meso-Functionalised porphyrin-α-diones have been prepared as the basic building blocks for bis-porphyrin arrays. meso-Halophenyl porphyrins 4 and 7 were prepared by condensation of 3,5-di-tert-butylbenzaldehyde with dipyrromethanes 1, 2, and 3. Conversion of 4 and 7 to the corresponding meso-halophenylporphyrin-α-dion…
The Sc 2 (WO 4 ) 3 type structure has been used in order to create new trivalent cation conducting solid electrolytes by forming solid solutions of the type (Sc 2 (WO 4 ) 3 ) 1– x (M 2 (MoO 4 ) 3 ) x (M=Nd, Sm, Gd, Lu). In these compounds, the anionic part of the structure is partly replaced by molybdate (WO 4 →MoO 4…
Aluminium thin films grown with different thickness on silicon substrates were analyzed by atomic force microscopy and grazing incidence x-ray techniques. Stress on surface film was found to be greater as the thickness increases because of the substrate history. Roughness measurements made on the AFM images shown a li…