Materials Literature
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Polypropylene staple fibres were mixed with cotton in different proportions for producing ring-spun yarns and the yarns so produced were converted into both woven and knitted fabrics. Various fabric properties including low-stress mechanical properties and hand values were determined on Kawabata fabric evaluation syst…
The low-frequency internal friction and elastic modulus have been measured as functions of temperature at different strain amplitudes in wrought Al–Mg–Si (6082) alloys after quenching and after ageing. The damping spectrum exhibits a relaxation peak located at about 420 K in over-aged specimens. This damping peak. wit…
A structural relationship between the μ-Al4Mn phase and the Λ-Al4Mn phase, which are approximants of icosahedral and decagonal quasicrystals respectively, was studied from the viewpoint of the modulated structure. The difference between these phases is basically understood by the difference in the ordered arrangements…
Magnetisation and magnetostriction are macroscopic manifestations of a complex magnetic domain structure that is modified by applied mechanic and magnetic loads. In the multiscale model used in this paper this domain structure is statistically described by a set of internal variables that are defined in each grain. Th…
In order to design an optimal planar inductor, this paper carries out several axisymmetrical magnetic field simulations fully taking the magnetic hysteretic properties of ferromagnetic core materials as well as open boundary condition into account. Finite element method is applied to evaluating the magnetic fields, re…
Abstract The chemical, textural and structural transformations of Al 13 -intercalated montmorillonite, resulting from the depolymerization of the interlamellar Al 13 polycations by Na salicylate solutions, were studied. Nitrogen gas adsorption shows a dramatic decrease in specific surface area from 493 to 39 m2g –1 ,…
Diammine cobalt(II) chloride, Co(N(H, D)3)2Cl2 was prepared by decomposition of the corresponding hexaammines at 120 °C in dynamical vacuum. Crystal structures and magnetic properties of these materials were characterised by X-ray and neutron powder diffraction, and heat capacity measurements. At ambient temperatures…
Abstract Polyolefins are under evaluation for a variety of applications with increasingly stringent requirements, including long‐term exposure outdoors. While the range of physical properties and appearance has been extended by the development of new resins, additives are required to help maintain those properties upo…
Abstract Large and well-formed crystals of strontium chlorapatite [Sr5Cl(PO4)3] were grown for the first time from a sodium chloride flux. The obtained crystals were colorless and transparent. The crystal growth of Sr5Cl(PO4)3 was conducted by heating a mixture of solute and flux at 1100 °C for 10 h, and then cooling…
The process of the developed plastic deformation is studied when defects density is so high that collective effects play key role. On the basis of conception of rearrangable potential relief, the field theory of the superplastic-state type of the Lüders band is stated. At stress more than a critical threshold, the dis…
An extension of a full-constraints Taylor model is presented which captures substructural dislocation features, e.g. cell boundaries and cell-block boundaries. This allows coupling the anisotropy due to slip processes, texture and substructure. The extended Taylor model is used to study the dislocation sheets during r…
The reflection spectra of porous gallium phosphide samples are investigated in the far infrared region of wave numbers (10–700 cm −1 ). In addition of the longitudinal and transverse optical phonon modes corresponding to the bulk material, additional vibrational modes are detected. Their number and spectral position a…
Disorder-enhanced diffusion of excitations in various aromatic systems can be accounted for by variability of the intersite overlap integrals as has been suggested by Pautmeier et al (1988, Chem. Phys. Lett., 143, 459) who calculated the ensemble-averaged diffusion coefficient and also carried out computer simulations…
Abstract Gaskets based on polytetrafluoroethylene (PTFE) are used extensively in bolted flanged connections, especially in difficult chemical process plant applications where blowouts due to excessive bolt load loss are of major concem. The determination of their service temperatures requires the characterization of t…
Semi-rigid polyesters from diphenyl dicarbonic acid and some branched propyl and butyl spacers have been investigated using Differential Scanning Calorimetry. From Δcp at Tg and the determination of the fragility index m, we studied the “strong-fragile” behaviour of these materials. All the samples appear thermodynami…
Abstract
Cation distribution in adsorbed and solution phases and their mobility in the soil profile are largely influenced by the cation exchange capacity and selectivity coefficient of the soil. Vermiculites (Vt) and montmorillonites (Mt) in acid soils and sediments are frequently interlayered by hydroxyaluminum (HyA). Such i…
Abstract A structurally ordered polyimide with the main chain having the complete “head-to-tail” bonding sequence (HTPI) or the complete “head-to-head” bonding sequence (HHPI) was prepared. The synthesis was based on the unique reactivity of an unsymmetric spiroalicyclic tetracarboxylic dianhydride, rel-(1R,5S,6R)-spi…
A model has been developed to predict the creep behaviour of nonwoven fabrics using the fibre creep data and the structural parameters of the fabric. A network structure of the constituent fibres of nonwoven fabric is considered and creep strain has been estimated for constant stress creep condition. The changes in th…
End-capped polyimide precursor solutions in ethyl alcohol were prepared by incorporating carbonyl groups into the polymer backbone of a second-generation PMR ( in situ polymerization of monomer reactants) polyimide, PMR-II-50, which exhibited good features as a matrix resin for carbon-fibrereinforced composites. Cured…