Materials Literature
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The effect of high boiling point solvent on the residual stress behaviors of semiflexible structure poly(4,4′-oxydiphenylene pyromellitimide) (PMDA-ODA) and pseudo-rodlike poly(p-phenylene biphenyltetracarboximide) (BPDA-PDA) polyimide was investigated. As a solvent, a mixed solution of 20 wt % cyclohexyl-2-pyrrolidon…
Structure–property relationships were studied in a series of hyperbranched polyesters based on dimethoxypropionic acid with ethoxylated pentaerythritol as the core. In DSC thermograms, all the polyols exhibit a prominent glass transition and a small melting endotherm. It is possible to model the glass transition tempe…
A new form of the thermodynamic potential is derived, in which minima correspond to the equilibrium thermodynamic states of an ellipsoidal ferroelastic inclusion surrounded by a linear elastic matrix. This potential takes into account the elastic energy stored in the matrix and enables the correct thermodynamic descri…
All articles of this category The phosphorous oxytrichloride mediated condensation of diaroylbipyrroles 5a - e with the α -unsubstituted pyrrole 2 was found to produce diarylbisdipyrrins 6a - e in good to excellent yields. The method is compatible with a series of functional groups on the aryl substituents. This paper…
The effect of electrochemical polarization on the catalytic SO 2 oxidation in the molten V 2 O 5 ‐ K 2 S 2 O 7 system has been studied using a gold working electrode in the temperature range 400–460°C. A similar experiment has been performed with the industrial catalyst VK-58. The aim of the present investigation was…
Aspirin (acetylsalicylic acid) has been vitrified (i) completely by melting and cooling, and (ii) partially by ball-milling at ambient temperature and then cooling. Its supercooled viscous liquid was found to be stable against crystallization for several days at 298 K even when it contained crystals. The time- and tem…
Grain growth behavior in correlation with magnetic loss has been investigated in Mn-Zn ferrites with the variation of additive content and particle size of the system. The powders of (Mn/sub 0.76/Zn/sub 0.24/O)/sub 0.94/(Fe/sub 2/O/sub 3/)/sub 1.06/ composition and the average particle size of 0.94 /spl mu/m and 1.93…
The possibility that biomineralized manganese dioxide (MnO2) might serve as an efficient cathodic reactant in mild steel corrosion was studied using stainless steel (SS) covered with microbially or electrochemically deposited MnO2 and galvanically coupled to mild steel and mild steel covered with microbially deposited…
Experimental studies have reported that complete healing of small-diameter expanded polytetrafluoroethylene (ePTFE) grafts occurs only if the porosity of the graft is increased, thereby allowing ingrowth of perigraft capillaries yielding endothelial cells. This study investigates the effects of varied graft porosity o…
Fresh cod fillets (Gadus morhua) were sprayed with a 10% acetate buffer (pH 5.6), packed with an industrial gas-flushing packaging machine under modified atmospheres (50% CO2--45% O2--5% N2, 2 cm3/1 g gas/product ratio) and stored at 7 degrees C for 12 days. Control cod fillets were directly packed and stored under th…
Well-defined organic crystals have been grown in inorganic gel coatings with particle sizes in the submicron range and narrow size distributions. The direct characterisation of these hybrid organic–inorganic films by optical confocal microscopy has allowed elucidation of the role of the main experimental parameters su…
Layered aluminosilicates and gallosilicates with kanemite structure and varied Si/M ratios have been prepared and can be transformed into mesoporous materials with MCM-41-like structure in an exchange solution of cetyltrimethylammonium chloride at pH 11.0–11.7 and 20–80 °C or at pH < 9.6 and 80 °C. The metal ions in b…
The amine template of hexagonal mesoporous silica (HMS) can be efficiently recovered and re-used by a new extraction procedure in acidified water rendering a directly usable high quality mesoporous support.
Molecular dynamics simulations of SPC/E water confined in a silica pore are presented. The simulations have been performed at different hydration levels and temperatures to study the single particle dynamics. Due to the confinement and to the presence of a hydrophilic surface, the dynamic behaviour of the liquid appea…
Viscoelastic behavior at elevated temperatures of high-density polyethylene and isotactic polypropylene was investigated by using the stress relaxation method. The results are interpreted from the view of an established two-process model for stress relaxation in semicrystalline polymers. This model is based on the ass…
The fracture behavior of ABS materials with a particle diameter of 110 nm and of 330 nm was studied using instrumented Charpy impact tests. The effects of rubber content and temperature on fracture behavior, deformation mode, stable crack extension, plastic zone size, J-integral value, and crack opening displacement w…
Abstract A recently introduced predictive scheme is used to calculate the permeability of various types of heterogeneous polymer blends, which are characterized by the ratio of the permeability of constituents in the range 10–10,000. The scheme combines a two‐parameter equivalent box model and the data on the continui…
The complexation of a carboxylate functionalized hexabenzocoronene with an amino functionalized polysiloxane results in a polymeric complex, which forms two highly ordered discotic columnar liquid crystalline structures Col1 and Col2. By using small-angle X-ray scattering it was shown that four columns per unit cell a…
Electrochemical deposition of zirconia on stainless steel has been investigated in order to provide supports of catalysts for NOx reduction. The zirconia films have been obtained in electrolytes based on anhydrous ethyl alcohol. The structure and chemical composition of the films have been characterized by SEM and XPS…
Zircaloy-2 plate with neutron exposure more than 3 × 1026 n/m2 (E &gt; 1 MeV) has been tested to study the effects of ultra-high neutron fluence on the mechanical and physical behavior of Zircaloy-2. The Zircaloy-2 plate used in this study is a section of a 6.4-mm-thick control blade follower that resided in a pre…