Materials Literature
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Abstract Curing characteristics of blends of a hydroxyl‐functionalized dendritic hyperbranched polymer (HBP) and a triglycidyl p‐amino phenol (TGAP) epoxy resin have been studied. THe HBP strongly enhances the curing rate owing to the catalytic effect of the hydroxyl groups. THe thermal and dynamic viscoelastic behavi…
The crystal structure and composition of nuclei for graphite spheroids in a ductile cast iron containing small amounts of magnesium and traces of aluminium have been studied in a transmission electron microscope equipped with EDX and parallel electron energy loss spectrometer and in an electron microprobe analyser. Th…
In the present investigation optical microscopy, in combination with sputtered neutral mass spectrometry (SNMS), has been used to examine the conditions for initiation of pitting corrosion in the heat affected zone (HAZ) of two super martensitic (SM) stainless steel weldments. It is shown that the corrosion resistance…
Superparamagnetisch werden die hier beschriebenen Triblock-Copolymer-Nanoröhren durch Behandlung mit Fe2O3. Die dabei erhaltenen Polymer/Fe2O3-Hybridnanofasern (siehe TEM-Aufnahme) zeigen interessantes Verhalten im Magnetfeld. So ordnen sich die Nanofasern in Magnetfeldrichtung an, und bei Mischungen der Nanofasern un…
Radar absorbing materials are designed and developed with carbon fibers and suitable matching layers. Complex permittivities of carbon fiber composite are predicted on the basis that the modulus of permittivity obeys a logarithmic law of mixtures and the dielectric loss tangents are related through a linear law of mix…
We report measurements on dielectric properties of a nematic liquid crystal in planar aligned cells with two different thicknesses (1.2 and 6.7 μm). The nematic has a wide thermal range and the temperature variation of the effective dielectric constant (ε⊥) of the thick cell reflects that of the orientational order pa…
Evaluation of the creep behaviour of 2.25Cr–1Mo and 9Cr–1Mo ferritic steel base metals, 9Cr–1Mo steel weld metal, and 2.25Cr–1Mo/9Cr–1Mo ferritic–ferritic dissimilar weld joints has been carried out at 823 K in the stress range 100–260 MPa. The weld joint was fabricated by shielded metal arc welding using basic coated…
Abstract Silk and wool fibers were acylated with two acid anhydrides, dodecenylsuccinic anhydride (DDSA) and octadecenylsuccinic anhydride (ODSA), at 75°C with N,N ‐dimethylformamide (DMF) or dimethyl sulfoxide (DMSO) as the solvent, the latter of which allowed higher weight gains to be reached. The weight gain and ac…
High‐temperature‐resistant ceramics in the system Mo‐Si‐O‐C were prepared from polymethylsiloxanes loaded with MoSi 2 filler. Irreversible structural rearrangement reactions in the polymer‐derived Si‐O‐C matrix phase and at the filler‐matrix interface during heat treatment were detected by in situ electrical resistanc…
Over the years, an enormous amount of experimental results have been reported on damage accumulation (e.g. void swelling) in metals and alloys irradiated under vastly different recoil energy conditions. Unfortunately, however, very little is known either experimentally or theoretically about the effect of recoil energ…
The crystal structures and chemical compositions of hydroxy-hydrated borate oxysalt minerals are interpreted in terms of the bond-valence approach to the structure and chemistry of oxysalts developed by Schindler & Hawthorne (2001). The grand mean Lewis basicity of structural units in hydroxy-hydrated borate minerals…
Thermomechanical effects in hybrid and cylindrical-hybrid oriented nematic liquid crystals (NLC), as well as thermomechanical effects in NLC with a homogeneous director distribution induced by quasistatic or light electric fields, are observed and investigated theoretically and experimentally. It is postulated that th…
The curing and mechanical properties of nitrile (NBR) and natural rubber (NR) blends were carried out. Two series of blends were prepared, i.e., NBR/SMR L and NBR/ENR 50 blends. Blends were prepared using a Brabender at a temperature of 60°C. Results indicate that the scorch time, t 2 and cure time, t 90 increase with…
We examined the effects of osmolytes, sucrose and trehalose, on the deterioration of hen lysozyme as a model protein. Sucrose and trehalose depressed the aggregation of lysozyme molecules caused by heating at 100 degrees C at pH 6. Since lysozyme was fully denatured under these conditions, the effects of sucrose and t…
The crystal structures of six birefringent uvarovite-grossular garnets from three localities (Saranov. Veselovsk, and Saranka. Ural Mountains. Russia) were investigated using single-crystal X-ray CCD diffraction data. The intensity and lattice parameter data attest to the violation of the cubic garnet space group Ia3̅…
A multiple grafting technique was used to synthesize arborescent-branched high-molecular mass poly(2,3-epoxypropan-1-ol). In the first step, linear polyglycidol (M̄n = 10 300) was obtained. Some of the hydroxyl groups were transformed into alcoholate anions in a reaction with potassium tert-butoxide, and the obtained…
Two new mineral species, carraraite and zaccagnaite, were found in cavities in calcite veins in marble quarries of the Carrara basin (Apuan Alps, Italy). Carraraite, Ca 3 Ge(OH) 6 (SO 4 ) 1.08 (CO 3 ) 0.92 ⋅12H 2 O, occurs as submillimetric crystals, tabular on {001}. The cell dimensions are a = 11.056 (3), c = 10.629…
Gel‐derived oxycarbide glasses have atomic network structures similar to that of vitreous silica glass but with carbon‐rich regions consisting of CSi 4 tetrahedra and C–Si–O bonds finely dispersed in the glass. Therefore, oxycarbide glasses exhibit the so‐called “anomalous” hardness behavior, similar to silica‐rich gl…
The paper presents a preliminary study on feasibility using shape memory alloy (SMA) passive devices for vibration suppression of building structures. A one-story prototype-building model is used. The structure is subjected to a base excitation and is strengthened by SMA diagonal bracing wires. Constitutive behavior o…
Abstract To modify carbon black surface, the surface grafting of hyperbranched poly(amidoamine) onto the surface by using dendrimer synthesis methodology was investigated. Carbon black having amino groups (initiator sites) was prepared by the reduction of surface nitro groups introduced by nitration of aromatic rings.…