Materials Literature
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Abstract Observations of natural minerals and experimental run products show that I-S (illitesmectite mixed-layer minerals) with a high illite content as well as pure mica-illite crystallites can have a lath shape (aspect ratio >3). This shape is common to the I-S minerals under a variety of conditions of formation…
Abstract Monte‐Carlo simulation was used to study the short‐chain branch formation of polyethylene made with a Ni‐diimine catalyst. Branches are formed through the chain‐walking mechanism without any comonomer addition. The model describes the type of branch, that is, methyl, ethyl, propyl, butyl, pentyl, hexyl, hepty…
Abstract A convenient method for the synthesis of poly(butylene succinate) (1) of high molecular weight has been developed. This polyester was prepared readily by the distannoxane-catalyzed polycondensation of succinic acid (2) with 1,4-butanediol (3) in decalin at 190 °C under azeotropic condition. The polycondensati…
A new electrooptical mode was discovered in Deformed Helix Ferroelectric (DHF) liquid crystal cells. This mode appears, if the driving voltage frequency and amplitude are rather high. The electrooptical response time τ0, 1-0, 9 is practically independent on temperature in a very broad range but it strongly depends on…
Abstract The effect of injection molding conditions and reactive compatibilization on the morphology of maleic anhydryde‐modified poly(phenylene oxide)/polyamide‐6 blends was investigated. The injection flow rate primarily influenced the position of the subskin layer, and the injection temperature affected the aspect…
A simple theoretical model is proposed for studying the properties of blended fibrous structures. The model is verified using experimental results from blended yams. The effect on a blended system's properties due to interactions of the different constituents in the blended structure is analyzed, and the parameters in…
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A series of polyimides were prepared by a solution polycondensation reaction between 3-carboxylmethylcyclopentane-1,2,4-tricarboxylic dianhydride and 4-alkyloxybenzene-1,3-diamines in N-methyl-2-pyrrolidone and chemical imidization with triethylamine and acetic anhydride. These polyimides possess great organo-solubili…
The oxidation of HCN has been conducted in a fused silica jet-stirred reactor (JSR) at atmospheric pressure and from 1 000 to 1400 K. The reduction of nitric oxide (NO) by HCN has also been studied in a JSR in the same operating conditions. A detailed chemical kinetic model for NO-reburning (751 reactions and 102 spec…
Abstract Ag+/ZSM-5 catalysts were prepared by an ion-exchange method. UV-irradiation of the Ag+/ZSM-5 catalysts in the presence of N2O led to the photocatalytic decomposition of N2O into N2 and O2 at 298 K. Investigations of the effective wavelength of the irradiated UV-light for the reaction as well as the in-situ ch…
The kinetic behavior of dislocation loops in overheated free-standing smectic-A films is reported. The loops open at velocities that are much faster than those seen in nonoverheated films. The velocities increase dramatically as a function of temperature and vary slightly as a function of film thickness. The behavior…
Effects of excluded volume interaction on the form factor of a block copolymer micelle model have been investigated by performing Monte Carlo simulations. The micelles are modeled as a corona of semi-flexible chains tethered to a spherical core. Simulated form factors are analyzed using the model proposed by Pedersen…
Abstract The structure of amorphous silica has frequently been compared with its crystalline counterparts in an attempt to understand the glass structure beyond short-range correlations. This paper presents results from neutron total scattering measurements of several polymorphs of silica and shows how these can be us…
Reflectance measurements and optical constants of thin films of ion-beam-deposited SiC, Mo, Mg(2)Si, and InSb and of evaporated Cr have been measured in the extreme-ultraviolet (EUV) spectral region from 49.0 to 200.0 nm. In this spectral region no optical constant data were available for materials deposited by ion-be…
Abstract Celadonite and glauconite samples heated at different temperatures were studied by X-ray and electron diffraction. For dioctahedral micas the in-plane component of the translation between layers ( c cosβ/ a ), which is strongly dependent on the position of the vacant octahedral site, significantly decreases a…
Abstract A large number of high‐density polyethylene (HDPE) powder samples produced by Phillips technology were taken from an industrial polymerization reactor and their catalyst residue content was determined by X‐ray fluorescence spectroscopy. The chemical structure of the powder was characterized by diffuse reflect…
Elastically coupled magneto-electric (ME) elements were constructed and their fundamental properties were studied, so as to examine whether the elements exhibit considerable ME effect at room temperature. The elements had a hybrid structure, in which thin soft glass substrates with highly magnetostrictive amorphous Fe…
Results are presented for the phase separation process of a binary mixture subject to a uniform shear flow quenched from a disordered to a homogeneous ordered phase. The kinetics of the process is described in the context of the time-dependent Ginzburg-Landau equation with an external velocity term. The large-n approx…
A geometrical model of the quasicrystal-to-crystal transformation is discussed on atomic scale. The central idea is to describe a quasiperiodic structure as a special type of incommensurately modulated structure. As a consequence thereof, the periodic average structure of a quasicrystal is also the average structure o…
The crystal structure of yoshimuraite, ideally Ba2Mn2TiO(Si2O7)(PO4)(OH), has been determined and refined to residuals of R = 3.0 % and wR = 4.1 % using material from the Taguchi mine, Aichi Prefecture, Honshu, Japan. It is triclinic, P¯1, with cell parameters a 5.386(1), b 6.999(1), c 14.748(3) Å, a 89.98(1), b 93.62…