The X-ray structure of a protonated hypervalent silanol
Careful hydrolysis of a pentacoordinate chlorosilane gives a pentacoordinate protonated silanol that resembles the intermediate in the aqueous hydrolysis of silanes.
Materials Literature
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Holographic fabrication of polarization selective diffractive optical elements on azopolymer film
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 of layered perovskite compounds CsLn2Ti2NbO10 (Ln = La, Pr, Nd, Sm) and CsCaLaTiNb2O10
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…
Alpha relaxation study in poly(vinyl chloride)/poly(ethyl methacrylate) blends using thermally stimulated currents
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…
Toughening of a copolyester with a maleated core-shell toughener
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…
Carbon black-filled poly(ethylene-co-alkyl acrylate) composites: Calorimetric studies
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…
Supramolecular liquid-crystalline polyurethane
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…
Attachment of bis-(trifluoromethyl)aryl labels onto the chain ends of poly(ethylene terephthalate) (PET) track-etched membranes and films by surface wet chemistry
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…
Mechanical and dynamic mechanical thermal properties of heat- and oil-resistant thermoplastic elastomeric blends of poly(butylene terephthalate) and acrylate rubber
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…
Chemical characterization of surfaces and interfaces with submicron spatial resolution
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…
A novel acetated 54-member crown-shaped polyoxomolybdate with unprecedented structural features: Na26[{Na(H2O)2}6({μ3-OH)4MoV20MoVI34O164(μ2-CH3COO)4}]·≈120H2O
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.
An investigation of the structure and corrosion resistance of a permanganate conversion coatings on AZ91D magnesium alloy.
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…
Multilayered supermolecular structures self-assembled from polyelectrolytes and cyclodextrin host–guest complexes
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…
Atmospheric pressure chemical vapor deposition of tin nitride thin films using a halide source
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…
UHF PD detection in GIS substations during on-site testing
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…
Poly[(silylene)diacetylene]/fine metal oxide powder dispersions: use as precursors to silicon-based composite ceramics
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…
Compatibility of poly(vinylidene fluoride) (PVDF)/polyamide 12 (PA12) blends
Poly(vinylidene fluoride) (PVDF)/polyamide 12 (PA12) blends showed new peaks in XRD profile with increasing PA12 and the crystallinity of PA12 significantly decreased with the addition of PVDF. PVDF showed three relaxation regions at about −40, 40, and 100°C, respectively, and glass transition temperature (Tg ) of PA1…
Crevice Corrosion Studies Using Electrochemical Noise Measurements and a Scanning Electrode Technique
The formation of crevice corrosion on type 304L stainless steel when immersed in 0.05 M ferric chloride solution has been used to investigate electrochemical potential noise measurements. The surface activity of the stainless steel was simultaneously studied using a scanning electrode technique to provide corroboratin…
Hazardous waste and solid waste
HAZARDOUS WASTE SOURCES AND EFFECTS Hazardous Waste Defined Hazardous Waste Sources Effects of Hazardous Waste CHARACTERIZATION, SAMPLING, AND ANALYSIS Hazardous Waste Characteristics Sampling and Analysis Compatibility RISK MANAGEMENT AND WASTE MANAGEMENT The Hazard Ranking System and the National Priority Lists Risk…
Studies on Schizopora flavipora s. l., with special emphasis on specimens from Taiwan
Volume: 76