Materials Literature
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Peripheral modification of the porphyrazine macrocycle is an important synthetic approach to β-substituted porphyrazine derivatives, especially those which cannot be obtained via direct template cyclotetramerization of maleodinitriles and other similar synthons. The paper presents the last results of the systematical…
Some properties of rare earth orthophosphates have been determined by means of synthesis, X-ray diffraction, infrared absorption spectra, and Raman spectra measurements. The results are: (1) a synthesis of new compounds GdPO4.2H2O weinschenkite type, (2) the salt readily lost its water and changed from the weinschenki…
We study the spectral width as a function of the external momentum for the dynamical structure factor of a disordered harmonic solid, considered as a toy model for supercooled liquids and glasses. In the contexts of both the single-link coherent potential approximation and a single-defect approximation, two different…
Recently published Monte Carlo simulation studies have demonstrated that carbon nanotubes could be a new adsorbent material for the storage of gases such as hydrogen. This engineering application suitable for the use of hydrogen in fuel cells has motivated much experimental and theoretical work, including the present…
Polymalatase from Physarum polycephalum calalysed the hydrolysis of beta-poly[L-malate] and of the synthetic compounds beta-di(L-malate), beta-tetra(L-malate), beta-tetra(L-malate) beta-propylester, and L-malate beta-methylester. Cyclic beta-tri(L-malate), cyclic beta-tetra(L-malate), and D-malate beta-methylester wer…
In-situ gas-phase Fourier transform infrared spectroscopy (FTIR) studies of thermally activated processes occurring in the metal–organic chemical vapor deposition (MOCVD) of La(hfac)3·diglyme provide evidence that the precursor can be evaporated from the melt up to 130 °C without side decomposition processes. In contr…
Abstract Polypropylene (PP) blends, commercially known as “impact polypropylene copolymers” (IPC), are produced by a sequential gas phase polymerization process. The final product is a complex mixture of polypropylene (PP) and a range of ethylenepropylene copolymers (EPC) with different ethylene contents. In the prese…
Partial modification of the nonionic polymer poly(N-2-hydroxy-propylmethacrylamide) by cinnamate produces stimuli-responsive copolymers. The hydrophobic character of the cinnamate chromophore induces not only a lower critical solution temperature (LCST) in water, but renders additionally the polymers photoresponsive.…
This contribution is concerned with the exceptionally strong influence of smectic mesophase formation on the optically induced orientation and on the surface relief grating formation in a liquid crystalline melamine derivative containing azobenzene groups. We demonstrate that the strong amplification of optically indu…
Reaction of sodium azide with manganese(II) and diethylnicotinamide (DENA) leads to the two-dimensional system trans-[Mn(DENA)2(N3)2]n. The compound crystallises in the P2/c (monoclinic) group. Structural determination shows layers of manganese atoms bridged by means of single µ1,3-azido bridges. The polymeric structu…
We studied various types of surface treatments for magnesium alloys that involved the application of chromium or manganese by measuring their corrosion potential using X-ray diffraction, X-ray photoelectron spectroscopy, auger electron spectroscopy, and microscopic examination. The chromium-conversion coating is compo…
This paper theoretically analyzes the hydrodynamic shape stability problem for sonoluminescing bubbles. We present a semianalytical approach to describe the evolution of shape perturbations in the strongly nonlinear regime of violent collapse. The proposed approximation estimating the damping rate produced by liquid v…
Formability on cylindrical deep drawing and mechanical properties at relatively low temperature was investigated for a commercially rolled AZ31 magnesium. A small punch radius, which ratio to thickness was 2.5, was adoped intentionally. At room temperature, brittle fracture occurred near the flat portion of punch shou…
SAN containing 20 wt % of reactive SAN-X has been melt blended with EPDM containing 50 wt % of EP chains grafted by maleic anhydride (EP- g -MA). Two types of reactive groups (X) have been attached to SAN (2 mol % of X), i.e., a primary amine and a precursor of it at the processing temperature, i.e., a carbamate. The…
The electronic situation of boron atom frameworks in boron-rich solids is not easy to understand. Attempts to describe such compounds according to known bonding theories such as the Lipscomb or Zintl−Klemm approaches, are not completely unambiguous. To gain further insight and to create a solid experimental basis for…
This review covers most of the authors' work on ring-opening polymerization and copolymerization of heterocyclic monomers during the time of their cooperation since 1985. The mechanistic aspects of anionic ring opening polymerization of cyclic carbonates with a variety of functional groups are described first. By sequ…
We have studied the crystallization of poly(ε-caprolactone) (PCL) with in situ optical rheometry and ex situ optical microscopy as a function of applied stress. The evolution of the birefringence and dichroism was monitored in parallel with the viscosity following a temperature jump from the melt to a final crystalliz…
Pulsed glow discharge plasma from a 1 Pa gas mixture of acetylene (C2H2) and hexafluoroethane (C2F6) was used to produce fluorinated diamond-like carbon (F-DLC) films on glass and polymethyl-methacrylate (PMMA) substrate. The composition of the F-DLC coatings was measured by using Rutherford backscattering spectroscop…
This study investigated the development of chromate-free corrosion protection systems for Alclad 2024-T3 (UNS A92024) aluminum alloy ([2A]) based on the concept of system approach interface engineering (SAIE) by chemical and plasma techniques. Anode magnetron enhanced direct current (DC) cathodic plasmas were used to…
A series of methyl-terminated oligooxyethylene ( CH 3 ( OCH 2 CH 2 ) n O , n = 8.8)-substituted phthalocyanines with peripheral substitution at four β positions, at four α positions and at the eight α positions was synthesized and structurally characterized. These compounds are isotropic liquids above 10 °C. Non-linea…