Materials Literature
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Abstract The polyphosphazene platform allows the design and synthesis of a broad range of different polymers, some of which have special properties as biodegradable materials. Different polyphosphazenes are produced mainly by means of macromolecular substitution reactions carried out on a reactive polymeric intermedia…
Atmospheric corrosion of mild steel, copper and zinc was studied in SO 2 environment under dynamic flow conditions by weight loss measurements, and their corrosion prevention by the use of volatile corrosion inhibitors such as cyclohexylamine (CHA) and dicyclohexylamine (DCHA) is discussed. These studies assume import…
For the first time the flexible cyclopentyl ring is used to build mesogenic units, and thus a novel mesogen-jacketed liquid crystalline polymer (MJLCP) poly(dicyclopentyl vinylterephthalate) is synthesized. The polymer forms a stable mesophase which changes to an isotropic phase at 267°C. The formation of a stable mes…
Characterization of microstructures with features from submicrometers to hundreds of micrometers requires versatile methods. Profilometry and optical microscopy cannot cope with submicrometer features, and atomic-force microscopy, scanning-electron microscopy, and near-field microscopy are inherently slow, off-line me…
Abstract Experimental brackets (300–450°C) on Sb-Bi partitioning between stibnite-bismuthinites (Sb,Bi) 2 S 3 and sulfosalts in the AgSbS 2 –AgBiS 2 binary subsystem (α-Ag(Sb,Bi)S 2 , β-Ag 5 (Sb,Bi) 4 I (Sb,Bi) II S 10 ) and extant constraints are used to define mixing properties and standard state Gibbs energies of S…
In this study the effect of the aminofunctional silicone softeners on fabrics’ heat and moisture transport properties has been investigated by means of Alambeta and Permetest instruments. The silicone treated PES blended fabrics are warmer to the touch, but less comfortable as regards their reduced water‐vapour permea…
Abstract Investigation of the biodegradability of water soluble poly(vinyl alcohol) (PVA) based blown films was carried out under different lab‐scale environmental conditions. In particular respirometric tests were utilized in order to evaluate the biodegradability of PVA films in composting, in modified Sturm test an…
In a single crystal of LiCoPO4 Raman scattering has been studied in a wide temperature range. Thirty-two of the 36 Raman-active vibrational modes predicted by group-theory analysis were detected. The experimental lines are identified on the basis of their polarization rules, frequency position, and temperature behavio…
Photoinduced nonlinear optical phenomena in Sb2Te3–CaCl2–PbCl2 glasses have been studied by experimental and theoretical quantum chemistry and molecular dynamics methods. Additionally, photoinduced two-photon absorption (TPA) and second-harmonic generation (SHG) were measured in the IR region from 5.8 to 18 µm. A CO l…
The aim of this study is to investigate the water (moisture vapor and liquid) transfer properties of two‐layer weft knitted fabric and some related factors. Some experimental fabrics with specific yarns and stitch densities were prepared. Water vapor permeability rate through the fabrics and liquid water transfer from…
Hydrothermal recycling is conversion of poly(vinyl chloride) (PVC) at high temperatures in a steam atmosphere into hydrogen chloride, a mixture of hydrocarbons and syngas. Hydrochloric acid can be recovered and the mixture of hydrocarbons and syngas can be used for energy recovery. A bench-scale bubbling fluidized bed…
The generation of high pretilt angles in nematic liquid crystal (LC), 4-n-pentyl-4-cyanobiphenyl (5CB), on the rubbed surface of polyimide (PI) containing trifluoromethyl moieties, was investigated. High pretilt angles of 5CB are strongly related to the low surface energy caused more by the existence of trifluoromethy…
Sixteen agricultural waste products were subjected to pyrolysis at 550°C under a nitrogen atmosphere. The precursors which were treated in this manner were fruit stones and nut shells (peach, apricot and olive stones; date pits, almond, hazel nut and pistacio shells), fibrous materials (sugar cane bagasse, date palm b…
Differential scanning calorimetry (DSC) was used to determine the transition temperature ranges (TTR) of four types of super-elastic orthodontic nickel-titanium coil springs (Sentalloy). A knowledge of the TTR provides information on the temperature at which a NiTi wire or spring can assume superelastic properties and…
The film rupture behaviour of dynamically strained metastable Ti-15wt% Mo-3wt% Nb-3wt% Al in the solution-treated and aged (STA) (β + α) condition that is prone to coplanar slip was examined. Film rupture was detected by rapid data acquisition (10 000 Hz, 40 nA resolution) of repassivation current transients on fatigu…
The controlled radical polymerization of butadiene initiated with 2,2′-azoisobutyronitrile (AIBN) and in the presence of 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) is presented. The produced oligomers which have number average degrees of polymerization ranging between 3 and 12 were characterized by NMR. This led to…
Post-weld heat treatment (PWHT) procedures and heat input during welding of 17–4PH stainless steel, using matching chemistry consumables, have been optimised in relation to its microstructural condition before welding based on room temperature tensile properties. The 17–4PH stainless steel was welded in two different…
A series of P=S-containing dendrimers (starburst macromolecules) were characterized by X-ray photoelectron spectroscopy (XPS). This technique is a unique tool for the identification of specific groups from these starbursts such as P=S, aromatic rings, C–O, and C=O. Surface elemental and chemical composition is found t…
The influence of a polymer network, stabilizing an initial texture of horizontal chevron geometry, on the in-plane smectic C* layer reorientation process is studied for different applied electric field conditions. As expected, the reorientation of smectic layers is strongly slowed down and eventually suppressed by the…
In order to study the mechanism of DC offset voltage generation in a hybrid-aligned nematic liquid crystal display (HAN-LCD), we theoretically and experimentally studied the electrooptic characteristics of a HAN sample. The results showed that decreasing the thickness of a LC alignment film strongly reduces the genera…