Materials Literature
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Abstract Morphology and properties of poly(butylene terephthalate) (PBT)/nylon 6 (PA6)/EVA‐g‐MAH ternary blends were investigated. The blends were prepared in a corotating, intermeshing, twin‐screw extruder. The incorporation of maleic anhyride (MAH) grafted onto ethylene‐vinyl acetate copolymer (EVA) (EVA‐g‐MAH) in t…
Las muestras palinológicas de sedimentos holocenos provenientes de la laguna Hinojales (37º 34’" S; 57º 27’O), sudeste de la provincia de Buenos Aires, contienen algas (Chlorophyta, Cyanophyta and Dinoflagellata) y acritarcos. Las algas clorofíceas consisten en cenobios de Pediastrum musterii Tell y Mataloni,P. boryan…
Internal space charge measurement has been mainly applied to investigate insulating materials used in RV apparatus, such as HVDC cables. We have observed the space charge profiles to monitor copper ion migration occurring in an insulation layer of a metal-base printed circuit board and found that the space charge dist…
Abstract Aggregation of colloidal clay particles (Na-montmorillonite) by CaCl 2 and anionic polysaccharide (succinoglycan) in turbulent conditions was investigated using time-resolved size measurements by laser diffraction on diluted (50 mg l –1 ) and stirred suspensions. Excess of Ca 2+ ions promotes coagulation of t…
Abstract Raman spectrometry, UV–visible–near IR and attenuated total reflection IR absorptions are used to analyze the protonation of the emeraldine form of the phenyl/—NH 2 end‐capped BQBBa tetramer and of the phenyl/—NH 2 end‐capped (BQBB) 4 a hexadecamere in strong (H 2 SO 4 or HCl), intermediate (CH 3 COOH) and we…
Porous SiC ceramics were synthesized by sintering pressed and pressed/CIPed powder compacts of α‐Si 3 N 4 , carbon (Si 3 N 4 :C = 1:3 mol as ratio), and sintering aids, at 1600°C for few hours to achieve a reaction, and subsequently sintering at a temperature range of 1750°–1900°C, in an argon atmosphere. High porosit…
Improved X-ray powder diffraction data for orthorhombic phosphorus, S.G. C mca (64) obtained in situ at synthesis conditions of 1.2 GPa and 1100 K, are described. Representative, as synthesized, data include 2.552 X , 3.320 4 , 2.595 3 , 5.191 2 , 1.630 2 , for least-squares unit-cell a =3.3182(6) Å, b =10.3744(18) Å…
Copper and palladium complexes of new salicylaldimines derived from 3,4,5-tridecyloxyaniline, 2,3,4-tridecyloxyaniline and 4-decyloxyaniline have been synthesized and characterized. All the ligands bear four or more aliphatic chains with the aim of inducing columnar mesophases at low temperatures. In particular, metal…
We describe a new and unique method for simultaneous determination of the groove depth and duty cycle of binary diffraction gratings. For a near-normal angle of incidence, the +1 and -1 diffracted orders will behave nearly the same as the duty cycle is varied for a fixed grating depth. The difference in their behavior…
Nous avons caracterise un echantillon de nepheline provenant de Egan Chute, pres de Bancroft, en Ontario, ayant une composition (K 1 . 3 2 □ 0 . 6 8 )(Na 6 . 0 5 Ca 0 . 2 2 )[Al 7 . 7 7 Si 8 . 2 1 O 3 2 ], par diffraction X sur monocristal, microscopie electronique a transmission, analyses thermiques, et diffraction X…
Silicon nitride ceramics seeded with 3 wt%β‐Si 3 N 4 whiskers of two different sizes were prepared by a modified tape casting and gas pressure sintering. The fine whiskers had a higher aspect ratio than the coarse whiskers. Quantitative texture analysis including calculation of the orientation distribution function (O…
Abstract Ikaite is a metastable hexahydrate of calcium carbonate, forming in aqueous conditions near freezing conditions. Neutron powder diffraction data of synthetic deuterated ikaite, collected at seven temperatures from 4 to 270 K, were refined. The linear thermal expansion coefficients are quite anisotropic, being…
The corrosion rate in the splash and tidal zones of marine steel structures is very severe. Thermally sprayed coatings of zinc or aluminium and their alloys are among the most important technologies to eliminate this problem. This experimental study on the protective properties of thermally sprayed zinc and aluminium…
Abstract Novel peroxide‐crosslinked composite materials based on ultra high molecular weight polyethylene fibers were studied in comparison with their non‐crosslinked homologues. Two material types were prepared, either by embedding the fibers in a low‐density polyethylene matrix, or by compacting neat fibers. The res…
Abstract The proposed model is based on the simplified description of the thread structure, and it works with the textile description of thread structure. The following textile parameters are used in the model: fineness of fibres, and number of fibres at the cross-section in the bundle and the filling. The formation o…
Abstract Sisal fiber reinforced benzylated fir sawdust composites belong to a new category of composite materials, in which both the reinforcement and matrix are based on plant fibers, i.e. renewable resources. The present paper discusses the water absorption behavior of the composites and its influence on the mechani…
An experimental study was conducted to determine the influence of temperature on crevice corrosion initiation for Alloy 625 (UNS N06625) in natural seawater. These tests showed that there was a critical potential-temperature-time relationship needed to initiate crevice corrosion. The potential necessary to cause crevi…
A scanning Kelvin probe technique has been used to study the influence of pretreatment and pigment interaction on the kinetics and mechanism of corrosion driven delamination processes affecting model polyvinyl butyral coatings adherent to the intact zinc surface of hot dip galvanised steel. The effects of incorporatin…
Abstract The barrier properties of model fabrics as a protection against UV radiation have been examined by measuring the UV absorbing capacity of polymers of selected fibres containing dulling agents and optical brightening agents.
A model of partial discharge development in electrical tree structures is presented. The model considers channel conductivity, charge transport, and electric field redistribution during propagation of the discharge along the channels. It has been used for numerical investigation of temporal-spatial and electric charac…