Materials Literature
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Lamellar single crystals of poly(ethylene terephthalate) (PET) have been prepared by our confined thin film melt polymerization method between glass at polymerization temperatures of 150° to 225°C. (010) twinned crystals are frequently observed among these lamellae, especially for those prepared at higher temperatures…
We present the results of a study of photoinduced anisotropy in a model chalcogenide glass ${\mathrm{As}}_{2}$ ${\mathrm{S}}_{3}$ in a wide spectral range using reflectance-difference spectroscopy. We have found that the anisotropy is induced at energies much exceeding the energy of the inducing photons and that the s…
Equilibration of aromatic poly(ether sulfone)s and poly(ether ketone)s under conditions of fluoride-catalysed ether exchange leads, at low polymer concentrations in dipolar aprotic solvents, to efficient ring-closing depolymerisation.
(1997). A Thermodynamic Analysis of the Contribution of Hydroxyproline to the Structural Stability of the Collagen Triple Helix. Connective Tissue Research: Vol. 36, No. 4, pp. 347-365.
A novel, anionic route to well-defined side-chain liquid-crystalline polysiloxanes is described. The usual cationic approach to these polymers leads to polydisperse materials with uncontrolled microstructures. Ring-opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly(dimethylsiloxane- co -methylvi…
The composition of the europium–thenoyltrifluoroacetone (TTA)–trioctylphosphine (TOPO) chelate in water in the presence of Triton X-100 was investigated. The stoichiometric composition was found to be Eu(TTA) 3 (TOPO) 2 , but different compositions can occur depending on the relative concentrations of the ligands. The…
Carbon nitride solids, predicted to exhibit bulk moduli comparable with or exceeding that of diamond, are reviewed for both theoretical and experimental developments. Progress in the theory and preparation of these solids is described detailing the structure, composition, thermodynamic aspects, and physical and mechan…
Abstract— The dynamic strain ageing (DSA) behaviour of A533B Class 1 reactor pressure vessel (RPV) steel, containing 5 ppm of free nitrogen, has been investigated over a wide range of strain rates from 3 × 10 −7 to 3−10 −3 s −1 and temperatures from 20 to 350°C. The DSA was observed within certain temperature ranges a…
Interaction of [Ti(η-C 5 H 5 ) 2 (O 2 CC 5 H 4 N) 2 ] with squareplanar cis-[Pt(PR 3 ) 2 (OSO 2 CF 3 ) 2 ] in MeNO 2 gives mixed Ti–Pt tetrameric metallomacrocycles, via self assembly, in excellent yields.
(1997). ‘Corrosion for science and engineering’. British Corrosion Journal: Vol. 32, No. 4, pp. 240-240.
Simple functional models for elementary steps in the total oxidation of methane over supported palladium catalysts were investigated using density functional theory. Three simple cluster models were proposed, namely, the palladium dimer and PdO diatomic and linear Pd2O, to probe the mechanism of the methane activation…
Various wet chemical digestion procedures, such as pressure digestion, microwave-assisted pressure digestion and decomposition via alkali fusion, were applied to different ceramic powders including Si 3 N 4 , BN and a new advanced ceramic material. The last powder was prepared from novel precursor compounds by pyrolys…
The effects of thermal treatment and zeolite proton concentration on the chemical state and metal particle size of zeolite Y supported ruthenium (3.0 wt%) have been investigated using H 2 -TPR, H 2 -TPD, TPMS, FTIR, TEM, and EXAFS. Heating in Ar of the precursor after ion exchange, [Ru(NH 3 ) 6 ] 3+ /NaY, up to 400°C…
Due to the increase of electromagnetic and electromechanical devices supplied by static converters, the classification and evaluation of the energetic behavior of soft magnetic materials, with nonsinusoidal supply, is becoming mandatory. In this paper, the possibility of defining a standard methodology for the specifi…
This paper considers the compression properties of yarns. A model is proposed which predicts the behaviour of yarns in compression; the model takes account of the structural characteristics of yarns and the finite dimensions of fibres. A device is described which has been successfully used to measure the effects of co…
A new photoactive bis-anthracenyl crown undergoes a reversible photocyclisation to form a cryptand, with the efficiency of the forward reaction and the rate of the thermal reverse reaction strongly affected by the presence of cation substrates.
Phenomenological modeling of the long term general corrosion of mild and low alloy steel specimens under marine conditions is considered, using weight loss as a function of time. A conceptual model for immersion corrosion, tidal corrosion and atmospheric corrosion under marine conditions is proposed. The model uses ac…
Nanostructured palladium clusters, stabilized by a monomolecular coat of sufactants N(C 8 H 17 ) 4 Br or N(C 18 H 37 ) 4 Br, self-assemble on carbon surfaces in an ordered manner with the formation of hexagonal close packed structures.
In order to study the kinetics of interaction of 3-aminopropyltriethoxysilane (APTS) on silica gel, silica gel samples reacted with APTS were prepared by sampling the reaction mixture from the reactor at various time intervals, and the concentrations of 3-aminopropylsilyl (APS) groups modified on the silica gel surfac…
This paper considers the distribution of fibres in yarns and discusses the development of a model for the simulation of fibre distributions; the concept of ‘virtual location’ within the cross-section domain, which may contain a fibre, is introduced. The distribution of fibres in real yarns is compared with computer-ge…