Materials Literature
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The physico-chemical phenomena developing along the screw axis of a twin-screw extruder during the grafting of maleic anhydride (MA) onto polyolefins [polyethylene (PE), ethylene–propylene rubber (EPM), and polypropylene (PP)] were investigated. For this purpose, sampling devices located along the extruder barrel were…
The purpose of this paper is to study the molecular mobility of paracetamol molecules in their amorphous state below the glass transition temperature (Tg) in order to evaluate the thermodynamic driving force which allows the amorphous form to recrystallize under different polymorphic modifications. Samples were aged a…
Some properties of serine acetyltransferases (SATs) from Escherichia coli, deleting 10-25 amino acid residues from the C-terminus (SATdeltaC10-deltaC25) were investigated. The specific activity depended only slightly on the length of the C-terminal region deleted. Although the sensitivity of SATdeltaC10 to inhibition…
The thermal and mechanical properties of corn (maize) (CZ) films plasticized with poly(ethylene glycol) (PEG) of two different molar masses (400 and 1000 g mol−1) were studied using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), tensile strength, moisture absorption isotherms and…
The structure of glasses in the K 2 O-Al 2 O 3 -TiO 2 -SiO 2 system was investigated using XANES spectroscopy. Glass samples, synthesized by quenching in air from high temperature fusions, represent the addition of Al 2 O 3 to a base of composition K 2 TiSi 4 O 11 in amounts corresponding to 0.25, 0.50, 0.75, 1.00, 1.…
Jute–polyester composites were fabricated with untreated (control) and bleached slivers with 60% loading of fiber by weight and were designated as JPH(C) and JPH(B), respectively. Both types of composite specimens were subjected to water absorption and outdoor weathering tests to assess their relative performance unde…
Abstract We have designed and synthesized 1,2-bis[6-(1-oxyl-3-oxide-4,4,5,5-tetramethylimidazolin-2-yl)-2-methylbenzo[b]thiophen-3-yl]hexafluorocyclopentene which shows photoswitching of intramolecular magnetic interaction by incorporating two nitronyl nitroxide into diarylethene photochromic spin coupler.
We describe here a controlled fabrication of ultrathin monolayer and multilayer films consisting of silicotungstic heteropolyanion and a cationic polymer of quaternized poly(4‐vinylpyridine) partially complexed with osmium bis(2,2'‐bipyridine) on Au electrodes previously self‐assembled with cysteamine monolayers based…
Shear-induced droplet breakup and coalescence were investigated by optical microscopy. Model polymer blends comprising 5% poly(propylene oxide) (PPO) dispersed in a poly(ethylene oxide) (PEO) matrix were studied in situ. Addition of 0.1% or 1.0% of PEO- b -PPO- b -PEO triblock copolymers facilitated breakup and inhibi…
An inner C-tolyl substituted Pd2+ complex of a doubly N-confused porphyrin (N2CP) was obtained from the reaction of N2CP and Pd(OAc)2 in toluene and the structure was revealed by a single crystal X-ray analysis.
An energy storage system based on battery and supercapacitors is presented. It allows bigger amount of intantaneous power. The properties of the proposed system are oriented in high efficiency, in a special topology with parallel channels. The paper presents also an active sharing device, for equalizing the voltages a…
Wheat straw, cane bagasse, and teak sawdust (agrowaste) were sieved up to a 425-μm mesh size and employed for sheet preparation with and without maleic anhydride (MA) treatment using Novolac resin in a 50 : 50 (w/w) ratio. The shore D hardness of MA treated and untreated wood polymer composites (WPCs) was measured. Th…
All-aromatic hyperbranched polyesters with hydroxy endgroups were functionalized with aliphatic n-alkyl carboxylic acids. The length of the n-alkyl chain as well as the degree of modification were varied and the resulting, partially amphiphilic polymers were characterized by differential scanning calorimetry (DSC). Wi…
Amorphous powders were synthesized by spray‐drying aqueous solutions of calcium and aluminum nitrates, followed by calcination in order to completely decompose the salts. The formation of pure calcium aluminates—C 3 A, C 5 A 3 , C 12 A 7 , CA, CA 2 , and CA 6 (C = CaO and A = Al 2 O 3 )—has been studied by DSC and XRD…
Reaction of indole with Br2 led to isolation of an indole trimer 2, formed by linking the 2- and 3-positions of each indole to form a central aromatic ring, and brominated at the 5- and 6-positions of each indole. The X-ray structure of [2]·acetone·2DMF showed π-stacking of the planar aromatic molecules with two diffe…
The performance of a single‐chamber solid‐oxide fuel cell (SOFC) made from an yttria‐stabilized zirconia solid electrolyte with a (GDC)‐containing Ni anode and a cathode was found to be significantly enhanced by the deposition of Mn, Ga, Cr, Ce, and Lu oxide layers on the YSZ surface. In particular, the deposition of…
A relatively detailed search for the optimum composition of phosphor was achieved by the pseudocombinatorial chemistry method (PCCM). The optimum ratio of BaO to was first found in terms of emission. As a result, the maximum luminance was obtained at the ratio of 1.3/6. Based on the host composition determined as , th…
Islamic star patterns are a beautiful and highly geometric art form. Many analyses have been done of their complex structure and symmetries. We pick up one line of analysis based on placing stars and rosettes in a formation dictated by a tiling of the plane, and develop a software implementation of the technique. We d…
In contrast to what is often expressed in the literature, reversible and irreversible solid(s)-solid(s) transitions in binary system of non-racemizable enantiomers are not always referred to as polymorphism. Order-disorder phenomena, miscibility gaps with critical temperatures and transitions in which three-phases or…
The partial discharge (PD) measurement is a sensitive method for testing and monitoring the insulation condition of HV apparatus. Digital PD measurements have become state of the art. Computer-based PD diagnostic systems nowadays can be used to increase the reliability of modern gas-insulated system (GIS). Also on-lin…