Materials Literature
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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…
The first part of this article concerns the thermodynamics of point defects. In the traditional analysis of reactions in which point defects are involved, point defects are assumed to be ideally diluted, which leads to familiar mass‐action‐type equations. In this article, situations in which deviations from ideal mass…
The melting behavior of paracetamol and polyethylene glycol (PEG) 4000, both individually and as binary systems, has been studied using differential scanning calorimetry. The appearance of the PEG peaks was shown to be highly dependent on scanning rate, with evidence for the existence of once-folded and extended chain…
Crack‐growth resistance‐curve (R‐curve) behavior for small (<400 μm) surface cracks and long (>3 mm) through‐thickness cracks is examined in two silicon carbide (SiC) ceramics that have sharply contrasting fracture properties. The first, an in‐situ toughened material designated ABC‐SiC, fails by intergranular fracture…
Magnetization and neutron-diffraction measurements were performed on a single crystal of ${\mathrm{Cu}}_{2}{\mathrm{MnSnS}}_{4}.$ This quartenary magnetic semiconductor has the stannite structure (derived from the zinc-blende structure which is common to many II-VI dilute magnetic semiconductors), and it orders antife…
We have successfully grown smooth diamond thin films epitaxially on (001) iridium surfaces through a direct-current plasma chemical vapor deposition process with two steps: ion irradiation pretreatment and diamond growth. The epitaxial areas of diamond thin films with a mean thickness of about 1.5 µ m seem to act as o…
The thermal conductivity κ and diffusivity α of high-strength and high-modulus crystalline polymer fibers (polybenzobisoxazole (Zylon \circR ) and polyethylene (Dyneema \circR )) and their fiber-reinforced plastics (FRPs) were measured in directions parallel and perpendicular to the molecular chain axis of the fibers.…
The effect of zirconium segregation on hardening in the creep of fine‐grained alumina was studied by using the tensile creep test. To avoid the effect of zirconia particle dispersion on creep, 100‐ppm‐zirconium‐doped alumina and 1000‐ppm‐zirconium‐doped alumina were fabricated by using a zirconium‐containing precursor…
The tetraaza macrocycles 2-oxa-3-oxotetramesitylporphine (|H(2) 1|) and 2-oxa-3-oxotetrakis(2,6-dichlorophenyl)porphine (|H(2) 2|) and the corresponding iron complexes (|Fe(III)(X) 1| and |Fe(III)(X) 2|; X= Cl(-), OH(-), or SO(3)CF(3)(-)) have been synthesized. These macrocycles are derived from porphyrins by transfor…