Materials Literature
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The hyperbranched copolymers were obtained by the atom transfer radical copolymerization of p-(chloromethyl)styrene (CMS) with N-cyclohexylmaleimide (NCMI) catalyzed by CuCl/2,2′-bipyridine (bpy) in cyclohexanone (C6H10O) or anisole (PhOCH3) with CMS as the inimer. The influences of several factors, such as temperatur…
Copolymers composed of 11-(4‘-cyanobiphenyloxy)undecyl acrylate (11CBA) and acrylic acid (AA), poly(11CBA- co -AA)s, were prepared by changing their molar ratio, and their structures were investigated under various temperatures. From wide- and small-angle X-ray studies, it was found that poly(11CBA) and poly(11CBA- co…
The percent cover and composition of benthic macroalgal growths and the structure of epilithic diatom communities were analyzed in 1995 at four sites in a stream flowing through a cultivated field near Kintore, Ontario, Canada. The dominant epilithic diatom taxa did not differ greatly among sites. However, a correspon…
This paper describes the engineering of patterned calcite films using templating by self-assembled monolayers (SAMs) supported on micropatterned mixed metal substrates. The substrates were prepared by deposition of one metal (Au, Ag) onto the surface of another metal (Au, Ag) through a stencil or photoresist masks. Th…
The elution curves of size exclusion chromatography for nonlinear polymers formed through random branching and crosslinking of long polymer chains were simulated with a Monte Carlo method. We considered two types of measured molecular weight distributions (MWDs): (1) the MWD calibrated relative to standard linear poly…
A new monomer, 2,5-bis(4-carboxy methylene phenyl)-3,4-diphenyl thiophene (V) has been synthesized and characterized by physical and spectroscopic methods. A series of eight aromatic–aliphatic polyamides was prepared from the (V) and different aromatic diamines using Yamazaki's direct phosphorylation reaction. The pol…
Development of the morphology of vicinal (0001) surfaces of α-alumina, induced by annealing in air at 1500 °C, was studied by AFM. Our investigation shows that the resulting surface morphology depends on both the duration of thermal treatment and the surface misorientation relative to crystallographic directions. The…
The combination of two different molecular architectures, the rather rod-like para-cyclophanes and two half disc-like 1,3-diketonate units fused viaortho-palladation leads to new liquid crystalline materials with a quite unusual molecular shape. By increasing the number of attached alkyl chains a discontinuous transit…
Dielectric dispersion studies of real ferroelectric crystals in the phase transition region indicate a deviation from the Debye response of pure crystals. In this paper the question of the origins of this deviation is addressed in terms of a probabilistic approach. An effort to understand the relaxation mechanism unde…
The mechanism and the crystallography of the nucleation and growth of cubic boron nitride (c-BN) films deposited on 〈100〉-oriented silicon substrate by RF bias sputtering have been studied by means of cross-sectional high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. Both methods pr…
This study is based on the design of s software program to generate a 3-D graphical representation of plain-knitted structures on a computer screen by using the basic fabric parameters, i.e, the yarn diameter, the course-spacing, the wale-spacing, and the stitch length. The mathematical model is set up to establish th…
We describe the synthesis, characterization and properties of the first optically-active 1,3-unsymmetrically disubstituted ferrocene derivative which is to exhibit smectic C* and smectic A* phases.
Living ω-aluminum alkoxide poly-ϵ-caprolactone and poly-D,L-lactide chains were synthesized by the ring-opening polymerization of ϵ-caprolactone (ϵ-CL) and D,L-lactide (D,L-LA), respectively, and were used as macroinitiators for glycolide (GA) polymerization in tetrahydrofuran at 40 °C. The P(CL-b-GA) and P(LA-b-GA) d…
The corrosion behaviour of a range of austenitic and duplex stainless steels has been studied in sea water containing sulphate reducing bacteria under conditions where the influence of an external aerated steel surface is absent. By means of a combination of anodic polarisation, cathodic polarisation, galvanic couplin…
Molecular transport of aromatic hydrocarbons through nylon/ethylene propylene rubber (EPR) blend has been investigated in the temperature range of 25 to 65 °C. The effect of blend ratio on the transport behavior was studied in detail. Nylon/EPR-50/50 blend shows the lowest uptake among all the systems studied. This be…
The paper deals with the determination of synchronous machine parameters using a 2D Finite Element Method â FEM (Flux2D- Cedrat). Simulations of no-load sudden three phase short- circuits are performed in rotation, the saturation effects and the eddy currents in the rotor solid iron parts are also taken into account…
Morphology development during isothermal crystallization in equal molecular weight isotactic polypropylene (iPP) and atactic polypropylene (aPP) blends was studied with time-resolved simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering methods with synchrotron radiation. The final long peri…
Abstract: A simple model of charge ordering is considered. It is shown explicitly that at any deviation from half-filling ($n neq 1/2$) the model is unstable with respect to phase separation into charge ordered regions with $n = 1/2$ and metallic regions with smaller electron or hole density. The model is extended to…
In this study we analyse the structure and composition of the periphyton, upstream and downstream of a fish farm located at an Andean stream. The effluents discharges large quantities of phosphorus and organic matter from the feed remnants and the faeces. The input of organic matter caused a reduction in algal biomass…
Polyhydroxyalkanoate(PHA) is a family of carbon and energy storage materials synthesized by many bacteria,its hydroxyalkanoate monomers have diversified structures.A broad screening process using the FT\|IR technique developed by us previously was carried out.Samples were collected from various geological locations ar…