Materials Literature
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Four kinds of polyurethane/polyacrylate interpenetrating polymer networks (crosslinked polyacrylate semi-IPNs, crosslinked polyurethane semi-IPNs, all-IPNs and all-IPNs with opposite charge groups) were synthesized by a simultaneous polymerization process. Their damping properties, mechanical properties and multiphase…
Abstract The wide-line NMR and viscoelastic measurements were carried out for the filled rubber systems. NMR results revealed that the filler-gel in the filled rubber composites had a multi-component system depending on the mobility of rubber molecules. The fraction and the spin-spin relaxation time of each component…
Parascorodite, a new mineral from Kaňk near Kutná Hora, Central Bohemia, Czech Republic, forms earthy white to white-yellow aggregates associated with scorodite, pitticite, bukovskýite, Kaňkite, zýkaite, gypsum, and jarosite, wet chemical analysis gave (in wt%): As 2 O 5 44.45, P 2 O 5 0.84, SO 3 1.53, Fe 2 O 3 34.55,…
A new series of mesomorphic complexes formed through intermolecular hydrogen bonding between p-n-alkoxybenzoic acids (where alkoxy denotes chains from propoxy- to decyloxy- and dodecyloxy-) and non-mesogenic p-hydroxybutyl benzoate, have been synthesized and characterized by thermal microscopy, differential scanning c…
Using the quantum chemical methods ab initio (B3LYP/6-31 G(D)) and the semi-empirical MOPAC/AM1, the dipoles and their angle with the molecular long axis and the polarizabilities and their anisotropies, have been calculated for different conformers of 5CB. On the basis of these data the dielectric constants and refrac…
The structure and properties of vacancy loops (VIs) and stacking-fault tetrahedra (SFTs) in copper have been studied by computer simulation using a long-range pair interatomic potential (LRPP), obtained from the generalized pseudopotential theory, and a many-body potential (MBP) of Finnis-Sinclair type. The results ob…
UNLABELLED: Platelet adhesion on the cardiopulmonary bypass oxygenator membrane is associated with impaired hemostasis. We investigated the effects of heparin coating of the oxygenator membrane on protein adsorption and platelet adhesion on the surface. Noncoated and heparin-coated polypropylene membranes were incubat…
ABSTRACT: Polyethylene glycol‐plasticized films were cast from alkaline (pH 11.25), heated (45 °C for 20 min), aqueous egg white (EW) solutions, with or without (10% or 20% w/w of EW) milkfat (two fractions), oleic acid, or egg yolk lysophospho‐lipid (LPL). The lipids did not reduce (P > 0.05) film water vapor perm…
A viscoplastic self-consistent (VPSC) multiscale model for predicting the plastic behaviour of materials with lamellar microstructures is presented. In this approach, three different scales are defined: the microscopic, at single crystal (single lamella) scale; the mesoscopic, at the scale of a single lamellar colony…
The glass transition temperatures Tg of butyl acrylate–methyl methacrylate copolymers obtained by free radical polymerization in 3 and 5 mol/L benzene solution have been measured using differential scanning calorimetry (DSC) and the values have been correlated using Johnston's equation with inter-intramolecular copoly…
The polarized Raman spectra of La0.7Ca0.3MnO3 magnetoresistive thin films deposited on LaAlO3, SrTiO3, YSZ, and MgO substrates were studied in a broad temperature range including Tc. Depending on variations of their intensity and linewidth upon cooling, the Raman bands could be classified into two groups. The lines co…
Novel water-soluble polyesters with pendant carboxylic groups were synthesized by polycondensation of ethylenediaminetetra-acetic acid (EDTA) dianhydride and diethylenetriaminepenta-acetic acid (DTPA) dianhydride with poly(ethylene glycol)s of different chain-lengths. Two experimental approaches (polycondensation usin…
Abstract Polymers possess a very large inherent capacity for property modifications. The bridge between structure or morphology and mechanical properties is created by the micromechanical processes of deformation and fracture, the “micromechanics.” Developments mainly in electron microscopy (EM) (scanning, transmissio…
The light-induced reorientation of nematic liquid crystals is discussed with special emphasis on the effect of dye-dopants. A molecular model is presented which accounts for the large increase of the optical torque, observed in absorbing nematics. An analogous process is described for dye-doped isotropic liquids and t…
We investigate the formation of a two-dimensional quasicrystal in a monodisperse system, using molecular dynamics simulations of hard-sphere particles interacting via a two-dimensional square-well potential. We find that more than one stable crystalline phase can form for certain values of the square-well parameters.…
At the macroscopic scale two different phenomena illustrate the couplings between the elastic and magnetic behaviours of ferromagnetic materials: first, magnetisation induces a deformation mechanism called magnetostriction, and, second stresses have an effect on the magnetic behaviour. The complexity of the non-linear…
A detailed survey is given of the models devised to describe the kinetics of charge movement, both electronic and ionic, through thin-film tungsten trioxide WO3 during either reduction or oxidation. The principal models are those of Faughnan and Crandall, Green, Ingram Duffy and Monk, and of Bohnke. Adjuncts and adapt…
Low-temperature sintering of (Pb 0.86 Ba 0.04 Sr 0.12 )(Zr 0.56 Ti 0.44 Sb 0.02 )O 3 (PBSZT) powders was investigated using Pb 5 Ge 3 O 11 (PGO) or LiBiO 2 (LBiO) as sintering aids. 1 wt% PGO or 1 wt% LBiO-added PBSZT powders could be densified into sintered bodies at 800°C for 2 h with a relative density of approxima…
We have investigated the dependence of the mechanoluminescence intensity from Sr3Al2O6: Eu on compressive stress. The distribution of the mechanoluminescence intensity, which is clearly visible to the naked eye, is consistent with the calculated stress distribution. The luminescence centre has been identified as the E…
We shall discuss our recent high pressure Raman studies on single wall carbon nanotube (SWNT) bundles and compare them with pressure-induced amorphous and polymeric phases of crystalline C60 and C70. Our high pressure Raman studies on SWNT bundles carried out upto 25.9 GPa show that the intensities of both the radial…