Materials Literature
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The dehydration reaction kinetics of tincal and borax decahydrate was investigated by thermogravimetry (TG) and differential thermal analysis (DTA). Various methods were used to analyze the TG and DTA data for determination of reaction kinetics. The activation energy, frequency factor, and order of reaction were calcu…
Unpolarized single‐crystal Raman spectra in the temperature interval of 298–1235 K and powder X‐ray diffractometry data from room temperature up to 1295 K have been obtained from a natural triclinic wollastonite of almost‐ideal composition. Room‐temperature spectra, along with the temperature dependencies of nine majo…
High-temperature annealing of thick silver films (TSFs) deposited onto a smooth dielectric substrate leads to high-order self-organization of metal clusters on the film surface. A comparative atomic force microscopic (AFM) analysis of “as-deposited” and annealed TSFs (aTSFs) shows that uniform ellipsoidal roughness ∼4…
Poly(N-vinylcarbazole), poly(N-carbazole) and poly(N-ethylcarbazole) powders were chemically synthesized by the reaction of ceric ammonium nitrate (CAN) with N-vinylcarbazole carbazole and N-ethylcarbazole in acetonitrile. Products were characterized by elemental analysis, Fourier transform infrared spectroscopy, scan…
ABSTRACT Equilibrium vapor pressures of allyl isothiocyanate (AIT) above pure AIT and AIT/canola oil mixtures from 15 to 45°C were estimated from AIT vapor densities using gas chromatography. Canola oil was an effective diluent for depressing AIT vapor pressure. Permeation of AIT in a PVDC/PVC copolymer film was measu…
The influence of sulfate‐reducing bacteria (SRB) on the passivity of type 304 austenitic stainless steel was investigated using x‐ray photoelectron spectroscopy (XPS) and electrochemical techniques. Multiple samples were exposed to a SRB culture, Desulfovibrio desulfuricans , and then resultant changes in the surface…
The silicone-based formulations now in use by Raychem have been specially developed for electrical insulating applications. They have undergone many years of development and optimization to yield exceptional electrical and weathering performance properties, comparable to the polyolefin copolymer materials. The intent…
Short unbranched alkanes, such as heptane and hexane, prefer extended conformations. Polythene chains prefer folded conformations. How long a chain can be built before the global minimum conformation ceases to be linear? The question is a difficult one, because exhaustive conformation searches on molecules of the size…
Abstract Modification of a poly(L‐lactide) (PLLA) base resin, by treatment with peroxides and compounding with plasticisers, yield resins which can be processed by conventional techniques and equipment to thin blown films, fibres and nonwoven fabrics having properties comparable to those of corresponding PP and PE sam…
The development of camber during the cofiring of a two‐layered structure of Ni‐electrode/BaTiO 3 ‐dielectric as a function of temperature has been investigated. At a given thickness of Ni electrode, less camber and camber rate with increasing thickness of BaTiO 3 dielectric have been observed. This phenomenon is attri…
A series of 1,2-1,4-polybutadienes with varying 1,2 (vinyl) content was investigated using time-domain dielectric spectroscopy. The time range was 10−5–300 s, which can be converted by Laplace transform to a frequency range of 10−3–6000 Hz. The samples were the same as those used in a previous rheological study from t…
Preparation methods for TiO 2 /PbS “coupled” type nanoparticles are described, in which PbS is formed in - situ on the surface of TiO 2 . FTIR was used to follow the preparation process and UV−vis spectra confirmed the stabilizing effect of TiO 2 on the formation of PbS nanoparticles. This “coupled” type of nanopartic…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotochemical P-450 Oxygenation of Cyclohexene with Water Sensitized by Dihydroxy-Coordinated (Tetraphenylporphyrinato)antimony(V) HexafluorophosphateShinsuke Takagi, Minako Suzuki, Tsutomu Shiragami, and Haruo InoueView Author Information Department of Industrial Chem…
Abstract Atomistic simulation calculations are used to predict the solution mechanisms and the defect cluster geometries of: M 2+ dopant cations in Y 2 O 3 , M 3+ dopant cations in CoO and M 2+ dopant cations in SrTiO 3 . The interatomic potential parameters were derived by simultaneously fitting the properties of a r…
The electrochemical response of polyaniline (PANI) in its undoped intermediate (emeraldine base, EB) oxidation state coated on cold rolled steel (CRS) or glass substrate has been evaluated by X-ray photoelectron spectroscopy (XPS). The oxidation state of the polymer was determined from the ratio of amine vs imine nitr…
In this paper a first attempt on the use of a neural network for the prediction of fatigue strength of composite materials is carried out. First some information about the composite used are given: it is on a graphite-peek composite with an average fibre content of 63%. Next a brief explanation about neural networks a…
We present a theoretical study of the conformations of a polymer brush (made of linear macromolecules chemically anchored to a flat, solid interface) when it is exposed to a molten, compatible polymer. At large brush grafting densities σ and melt molecular weights P, the melt only penetrates the brush over a distance…
Rheological and dielectric behavior was examined for concentrated solutions of a styrene−isoprene−styrene (SIS) triblock copolymer in monomeric and polymeric I-selective solvents, n -tetradecane (C 14 ) and a low- M homopolyisoprene (I-1; M = 1.4K). The I blocks had symmetrically once-inverted dipoles along the block…
The preparation and characterization of poly(aryl ether sulfone) (PES) PolyHIPE (polymerized high internal phase emulsion) materials is described. A maleimide-terminated aryl ether sulfone macromonomer was copolymerized with styrene, divinylbenzene (DVB), or a bis(vinyl ether) species, in the continuous phase of a HIP…
Abstract Raman microscopy of the kaolinite polymorphs was used to study single crystals and bundles of aligned crystals of kaolinite. The spectra of the hydroxyl stretching region were both sample and orientation dependent. Kaolinites can be classified into two groups according to the ratio of the intensities of the 3…