Materials Literature
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A series of copolyesters were prepared by a direct polycondensation of 3-(4-hydroxyphenyl) propionic acid and p-hydroxybenzoic acid (HBA), vanilic acid (VA), or syringic acid (SGA) of different composition in pyridine using diphenyl chlorophosphate and lithium bromide as condensing agents. The effects of methoxy subst…
The thermal behavior was investigated for the Zn complexes of carbohydrazide and semicarbazide with Sr(NO3)2 and 10% CuO as the oxidizing agent. In both complexes, there was little difference in the various combustion characteristics. The combustion reactivity was relatively low compared with the case of using other o…
Free-energy related properties for penetrant sorption (water, methane, argon, oxygen, nitrogen, ethane, propane, and carbon dioxide) in amorphous polyethylene have been evaluated by a test-particle-insertion method with the excluded volume map sampling (EVMS). Two model systems, one a long chain model composed of 4 li…
The degradation of cathodoluminescent brightness under prolonged electron beam excitation of phosphors has been identified as one of the outstanding critical issues for the flat-panel field emission industries. The ZnS : Cu,Al,Au phosphor powders have been subjected to electron beam bombardment of 2 keV with different…
The corrosion protection characteristics of an epoxy-polyamide coating were investigated by electrochemical impedance spectroscopy in immersion tests performed in a 3.0% NaCl solution. Carbon steel and galvanized steel substrates were employed. A porous film was produced on the metallic substrates, which allows for el…
Artificially designed gelatins comprising tandemly repeated 30-amino-acid peptide units derived from human alphaI collagen were successfully produced with a Bacillus brevis system. The DNA encoding the peptide unit was synthesized by taking into consideration the codon usage of the host cells, but no clones having a t…
Citronellal was converted into isopulegol epoxide in a one-pot two-step reaction achieving a 68% global yield on Ti-MCM-41 and designing a two-solvent catalytic system.
La0.9Sr0.1Ga0.8Mg0.2O3 − x (LSGM) has been prepared by a complexing sol–gel process and characterised by X-ray diffraction, thermogravimetric-differential thermal analysis (TG-DTA) and conventional weight analysis. The room-temperature structure is orthorhombic, space group Pnma, with a = 5.5340(14), b = 5.5074(22), c…
With the development of squeeze casting, thixocasting and vacuum pressure die casting it became possible in the last five years to apply light metal pressure castings for safety critical areas of modern vehicles even in large volume production [1-10]. The newly developed casting processes allow the production of near…
Hybrid organic‐inorganic particles combine the best properties of silica — high efficiency and excellent mechanical strength — with the best properties of organic polymers — a wide pH stability range and reduced silanol effects. In this article, the authors describe reversed-phase HPLC packings based on hybrid particl…
Reaction of the verdazyl precursor 1,4,5,6-tetrahydro-2,4-dimethyl-6-(2′-pyridyl)-1,2,4,5-tetrazin-3(2H)-one (pvdH3) with oxygen and copper(I) bromide in acetonitrile results in precipitation of the crystalline diradical di-μ-bromo-bis[(1,5-dimethyl-6-oxo-3-(2-pyridyl)verdazyl)copper(I)]. The solid shows a slightly an…
The aim of the present work is to focus on the characterization of materials in situ by using a modified near‐field scanning optical microscope (NSOM) with a home‐built tuning fork head that allowed us to obtain optical imaging concurrently with topography of some systems. The first example is related to finding precu…
This paper compares a dibromo and a structurally strictly related diiodo monomer in regard to the respective achievable molecular weights and the degree of incorporated phosphorus when subjected to the Suzuki polycondensation. The diiodo monomer gives – by a factor of roughly two – a higher molecular weight PPP (Pn up…
The evaluation of the ampacity of electric power cables and the overload protection are currently based on criteria, to which the operation of the circuits will have to satisfy each time like the first time, without self-memory of the way of life, without discounts or debts correspondent to the actual profile load, ce…
( Ce 0.83 Sm 0.17 ) 1 − x Zr x O 2 − δ ( x = 0 to 0.50 ) solid solutions were synthesized for the first time by the hydrothermal method. The electrical properties of the solid solutions have been studied in air and under reducing conditions. Solid solutions with the fluorite structure were formed in all of the studied…
Relaxor-type ferroelectric perovskites, (1-x)PNN · xPT, were prepared through process of heat treatment and then acid treatment of oxide mixtures containing PbO in amount greater than in the perovskite composition. For obtaining the perovskites without formation of pyrochlore phase, it was essential that the amount of…
Tris(2,2′-bipyridine)Zn(II) tetrakis(2-chloro-4-nitrophenolate)Zn(II), [Zn(bpy)3][Zn(CNP)4] 1, is a new octupolar material for quadratic nonlinear optics. 1, a chiral metal–organic complex, crystallizes in space group C2. Refinement of the Flack parameter supports the description of the [Zn(bpy)3]2+ cation as the Δ en…
The objective of this research is to understand the effects of crack tip mechanics on environment‐assisted cracking (EAC) of α‐precipitation hardened β‐Ti alloys. Precracked Ti–8V–6Cr–4Mo–4Zr–3Al and Ti–15Mo–3Nb–3Al are prone to severe EAC in aqueous NaCl when stressed under fixed or rising displacement. The latter is…
The ternary neodymium versatate (NdV3)-based catalyst system, NdV3/SiCl4/Al(iso-Bu)2H, for the stereospecific polymerization of 1,3-butadiene (Bd) has been studied at a catalyst concentration of 0.11 mmol Nd per 100 g Bd. The effects of the concentration of SiCl4 following in situ activation, preformed at 20 °C in the…
The synthesis and characterisation of several hepta-substituted triphenylene derivatives are reported. These unsymmetrically substituted triphenylene derivatives are of three varieties, i) with seven identical peripheral alkoxy chains, ii) two or three out of the seven alkoxy chains have different chain lengths and, i…