Materials Literature
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In order to improve blood compatibility, the surfaces of polyethylene terephthalate (PET) were treated using CO2 pulsed and KrF excimer lasers. The physico-chemical characterization of the laser-treated PET surfaces was carried out through attenuated total reflectance infrared spectroscopy and contact-angle measuremen…
An experimental study of the thermal transition behavior and blend miscibility of hydrogenated acrylonitrile-butadiene rubber (HNBR) is described. Glass transition temperatures were determined as a function of composition. It was found that copolymers in the 40–50% composition range crystallized as did low acrylonitri…
Two types of dendrimers with a 1,3,5-triazine ring at the branch point were synthesized by divergent and convergent methods. The divergent method began with 2,4,6-tris(p-nitroanilino)-1,3,5-triazine as a trifunctional core. Each cycle involved the reduction of the peripheral NO2 group followed by a reaction with 2-chl…
Polytetrafluoroethylene sheet samples have been treated in a low-power plasma cell using O2, Ar, N2 and NH3 feed gases. The surfaces became significantly more wettable in simulated body fluid and bromonaphthalene. By using a range of techniques, this was found to be principally due to chemical changes at the surface i…
The development and structural changes of V4+ and Mo5+ centers in caesium salts and the acid form of molybdovanadophosphorus heteropoly compounds CsxH4−xPVMo11O40 ·nH2O (x=0, 3, 4) of Keggin structure were investigated by electron paramagnetic resonance (EPR) after preparation, thermal treatment in oxygen, reduction b…
Ethylene/l-octene copolymers produced with metallocene catalysts are believed to have a homogeneous comonomer content with respect to molecular weight. Two series of copolymers of different molecular weights with a 1-octene content ranging from 0 to 39 branches per 1000 carbon atoms were studied. The influence of bran…
Binary systems of chlorinated polyethylene (CPE) and chlorinated paraffin (CP) or 3,9-bis[1,1-dimethyl-2{β-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) and their ternary systems were investigated by dynamic mechanical analysis, thermal analysis, and infrared…
A series of six potentially bidentate ligands composed of 5-membered heterocyclic rings with methylenepyridyl substituents are described. These molecules are potentially bifunctional, acting as bidentate ligands to metal centres whilst retaining on their periphery a range of groups capable of forming triple hydrogen b…
Nitrile rubber–PVC composites having carbon black and mica fillers in different compositions as hybrid reinforcements were studied. The effect of the silane treatment of mica, the degree of replacement, and the molecular architecture of nitrile rubbers on static-dynamic mechanical, swelling, and curing behavior of the…
A simple and efficient adaptive mesh generation algorithm is proposed for the full-wave finite-element analysis of optical waveguides using edge/nodal hybrid elements. We employ a local weight defined by a difference between the fundamental and the higher order element solutions. This method can be used for both the g…
The accumulation of space charge in planar crosslinked polyethylene (XLPE) samples under dc electric fields at room temperature was investigated using the pulsed electroacoustic (PEA) method. Three different organic semiconductor (semicon) materials containing carbon black at concentrations /spl sim/30 %wt, and vacuum…
Abbreviations: ATP’ase, adenosine triphosphatase; IR, infrared; MRSA, methicillin-resistant Staphylococcus aureus; PBP, penicillin binding protein; pM, pH meter reading TIM, triosephosphate isomerase.
The vibrational spectrum of tetraethylorthotitanate (TET) has been assigned by using vibrational and structural data from the series Ti(OEt)yCl4 − y (y = 1 to 4), to distinguish between bands due to bridging and terminally coordinated ethoxide. EXAFS studies of the series showed an increase in association with increas…
Instrumental manipulations during minimal access surgery (MAS) are limited by the four degrees of freedom (d.o.f.) possible when long instruments are introduced into the peritoneal cavity through access ports. This is in sharp contrast to an equivalent instrument held in the hand by the surgeon during open conventiona…
Phenolic resin/silica hybrid ceramers were prepared through sol–gel technology. Differential scanning calorimetry and thermogravimetric analysis methods were utilized to study the thermal properties of the fabricated hybrid ceramers. The results showed that the heat resistance of the ceramers was slightly higher than…
A technique has been established to grow large diamonds up to 2 cm. The crystals are bulky polyhedron with yellow, blue, green or brown color as well as colorless, which depend on impurities. The impurities incorporated into the diamond are limited, i.e. nitrogen, boron, nickel, cobalt, silicon and phosphorus.
Photolysis (254–350 nm) of a variety of aroyl-substituted phenylacetic acids and p-acetylphenylacetic acid in aqueous solution at pH > pKa resulted in efficient photodecarboxylation (Φ = 0.2–0.7), to give in most cases a single product arising via the corresponding arylmethyl carbanion, indicating that photodecarboxyl…
The combustion behaviour and thermal decomposition of ethylene–vinyl acetate copolymer (EVA) (26 wt% vinyl acetate content) formulations containing alumina trihydrate, ammonium polyphosphate, melamine, pentaerythritol and their co-mixtures, were studied using cone calorimetry and thermogravimetric analysis. Formulatio…
Dynamic viscoelastic properties of binary blends consisting of an isotactic polypropylene (i-PP) and ethylene-1-octene copolymer (PEE) were investigated to reveal the relation between miscibility in the molten state and the morphology in the solid state. In this study, PEE with 24 wt % of 1-octene was employed. The PE…
Microchannels having highly enhanced surface area have been fabricated by a thin‐film deposition technique known as glancing angle deposition. Porosimetry and simulation of the microstructures was used to estimate the surface area enhancement of the new microchannels. Two distinct types of microchannels have been crea…