Materials Literature
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Styrene and maleic anhydride (MAn) were successfully grafted, alone and simultaneously, onto various model hydrocarbon substrates at 180 °C with 2,5-dimethyl-2,5-di-(t-butyl peroxy)hexane (L101) as a free-radical initiator. Dodecane, 1-dodecene, and 2,6,10,14-tetramethylpentadecane were selected as model compounds to…
An analytical technique is developed for predicting the performance of a bonded Halbach oriented anisotropic magnet, with due account of partial alignment of the NdFeB powder during injection molding. The predicted performance of a 12-pole injection molded, Halbach oriented magnet is compared with measurement.
In succession to our work on aluminium films a systematic database of thin-film measurements on palladium films by electron probe microanalysis is presented. This time the measurements were performed at accelerating voltages between 4 and 30 kV, again on films of six different nominal thicknesses, ranging from 100 to…
β‐aluminas were successfully synthesized by direct solid‐phase reaction. Contrary to other β‐aluminas. Srβ‐alumina doped with showed two strong phosphorescent peaks at 482 and 502 nm, which were different from the peak of fluorescence (465 nm). These phosphorescent peaks were dependent on the excitation wavelength. Th…
Careful hydrolysis of a pentacoordinate chlorosilane gives a pentacoordinate protonated silanol that resembles the intermediate in the aqueous hydrolysis of silanes.
Polarization selective grating elements are fabricated on azopolymer film by superposing an interference pattern due to +45 : −45 ° polarized light beams. The transmission type grating shows unique features due to the simultaneous presence of bulk birefringence grating and surface relief grating. The birefringence gra…
B-site cation arrangement and crystal structure in the layered perovskite compounds CsLa2Ti2NbO10 (Ln = La, Pr, Nd, Sm) and CsCaLaTiNb2O10 have been investigated by the Rietveld analysis of the powder X-ray diffraction patterns, lattice energy calculations, and intercalation reactions. In CsLa2Ti2NbO10, equal numbers…
Thermoelectrets of poly(vinyl chloride) (PVC) and poly(ethyl methacrylate) (PEMA) blends were prepared using the conventional thermal poling method. α-Relaxation in this polyblend was investigated using thermally stimulated depolarization currents (TSDC). The global spectra of the polyblends revealed that the two poly…
A reactive extrusion process was developed to toughen an amorphous copolyester (PETG) of ethylene glycol, terephthalic acid and 1,4-cyclohexanedimethanol using either a maleic anhydride grafted polyethylene–octene elastomer (POEg), or a maleic anhydride grafted mixture (TPEg) of the polyethylene–octene elastomer and a…
The calorimetric characteristics of carbon black (CB)/poly(ethylene-co-alkyl acrylate) composites depend on both the CB and acrylate contents. An increase of the acrylate content in the pure copolymers tends to decrease all the crystalline characteristics: Tc,n, the nonisothermal crystallization temperature; Tm, the m…
A novel supramolecular liquid-crystalline polyurethane was prepared by mixing the polyurethane containing a pendant pyridyl unit as H-bond acceptor and 4-dodecyloxybenzoic acid as H-bond donor. Intermolecular hydrogen bond formation was confirmed by Fourier transform infrared spectroscopy. The liquid-crystalline behav…
Organic chemistry performed at the solid–liquid interface allowed us to achieve the selective chain-end functionalization of poly(ethylene terephthalate) (PET) membranes and films with perfluorinated labels. The carboxyl endings were activated with water-soluble carbodiimide and were coupled to 3,5-bis(trifluoromethyl…
Poly(butylene terephthalate) (PBT) and acrylate rubber (ACM) were melt-blended in a Brabender Plasticorder at 220°C and 40 rpm rotor speed. The blends were dynamically vulcanized by the addition of hexamethylenediamine carbamate (HMDC) during the melt-blending operation in the Brabender. Dynamic mechanical thermal ana…
Probed length scales of submicrometre dimensions have been achieved in x-ray photoelectron spectroscopy using synchrotron light sources. This has contributed to advancing the frontiers of surface and interface research, providing spatially resolved information for complex heterogeneous systems. This paper overviews th…
The EPR silent acetated 54-member crown-shaped polyoxomolybdate Na26[{Na(H2O)2}6( {μ3-OH)4MoV20MoVI 34- O164(μ2-CH3COO)4}] ·≈120H2O (1), constructed from two different but related building blocks in a new mode, is synthesized in high yield by reducing an acidified aqueous solution of Na2MoO4·2H2O and CH3COONa·3H2O.
Conversion coatings for magnesium have traditionally been based on immersion treatment in the solution containing hexavalent chromium compounds. The excellent performance of these coatings as paint bases has been established in a broad range of application. However, the replacable surface treatment has been strongly e…
Supermolecular multilayers with high levels of compositional and structural complexities have been fabricated with an example that involves formation of stable host–guest complexes from bolaamphiphiles and cyclodextrins, followed by sequential build-up of multilayered films by these complexes in combination with anion…
Preparation of SnNx films has been studied by atmospheric pressure chemical vapor deposition using SnCl2 and NH3 as starting materials. The films were deposited onto a quartz substrate at 550–675 °C with growth rates of 0.1–2.5 µm h−1. They showed a typical X-ray diffraction pattern for SnNx with a hexagonal structure…
This paper handles the experience with ultra high frequency (UHF) partial discharge (PD) detection during on-site testing of GIS. A typical PD monitoring system is described. The Cigre sensitivity verification for the UHF method is explained with reference to a test section of a GIS. Examples of PD events from on-site…
A synthetic route to silicon-based composite ceramics that employs organosilicon polymer/metal oxide precursors is described. The precursor materials were obtained by dispersing metal oxides in the poly[(silylene)diacetylenes] 1. Subsequent pyrolysis of the dispersions above 1400 °C under various experimental conditio…