Materials Literature
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Abstract A range of polyimides have been subjected to electron beam radiolysis at different temperatures. These polyimides were chemically designed to suit space applications, being either transparent or having groups which provide oxidation resistance. The structural changes that occur in the polyimides, when subject…
This work is mainly an investigation of some of the liquid-to-solid properties of pure benzene on a restricted domain of high pressures (20.6< or =P< or =102.9 MPa). Newly obtained equilibrium experimental data and recently developed analytical equation of state are exploited and compared with each other and with prev…
Abstract A new type of solid state electrodes sensitive to pH changes is described, in which the chemical‐sensitive layer consists of Pt microparticles deposited on a conducting polymer (polyaniline, polypyrrole) blend containing 22.7% w/w zeolite. These sensors are stable in aqueous electrolyte solutions of low pH va…
Abstract The tensile behavior under monotonic loading and stress‐relaxation testing of an epoxy resin has been studied. Experimental data at various strain rates and three temperatures from ambient up to just below T g were performed, to study the transition from the brittle behavior to a ductile and therefore viscopl…
A comparison is made between the vibrational characteristics of the carbonyl and cyanide ligands. There are significant differences; the latter has a smaller dipole moment and a larger quadrupole moment associated with the bond stretch. This quadrupole moment may be linked to the observation that the totally symmetric…
The fracture toughness of a crystalline silicon carbide fiber, Tyranno‐SA ® , was determined by introducing an artificial notch directly into the fiber test specimens using a focused‐ion (Ga + ) beam. The relation between fracture strength and notch size was determined experimentally, while the relation among the notc…
Highly conductive Gallium‐doped zinc oxide (Zn 1− x Ga x O) powder was prepared by calcining precursor that was synthesized from ZnSO 4 ·7H 2 O, GaCl 3 , and NH 4 HCO 3 by the co‐precipitation method. The effects of temperature, heating time, and atmosphere on the calcination process were studied, and we found that th…
Abstract Fourier transform infrared spectroscopy is applied in the study of interactions between PVC resin and plasticizers in flexible PVC systems. The comparison of the theoretical infrared spectra coming from the addition of the respective component infrared spectra with those of PVC/plasticizer experimental system…
Abstract Polyaniline (PANI)/porous silica MCM‐41 (MCM‐41) composite was synthesized according to surface polymerization theory, and it was confirmed through comparing with PANI/solid silica (SiO 2 ) by TGA and XPS techniques. The morphology and composition of the composite were also characterized by some techniques su…
Abstract A dispersion of isotactic polypropylene (PP) nanoparticles was produced by interfacially‐driven breakup of PP nanolayers. Layer‐multiplying coextrusion was used to fabricate an assembly of 257 alternating PP nanolayers about 12 nm thick sandwiched between thicker polystyrene (PS) layers. Characterization by t…
In a recent work, we have reported the optimization of the spark plasma sintering (SPS) parameters to obtain dense nanostructured 3Y‐TZP ceramics. Following this, the present work attempts to answer some specific issues: (a) whether ZrO 2 ‐based composites with ZrB 2 reinforcements can be densified under the optimal S…
The heterodinuclear complex [LCuIIVIVO] 1 was synthesized by using a new unsymmetric dinucleating ligand based on 1,8-naphthalenediol, whereas the homodinuclear CuIICuII complex 2 has a bridging beta-diketimineamid unit. Here we report on the synthesis, molecular structures, and magnetic properties of 1 and 2. In the…
Abstract N ‐Phenyl‐3‐substituted 5‐pyrazolone derivatives were investigated as organic photostabilizers for rigid poly(vinyl chloride) (PVC). Their stabilizing efficiency was evaluated by the determination of the weight loss of the polymer after irradiation for different periods and by the determination of the amount…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTChirality Information Transfer in Polylactides: From Main-Chain Chirality to Lamella CurvatureDamien Maillard and Robert E. Prud'hommeView Author Information Department of Chemistry, Université de Montréal, Pavillon J. A. Bombardier…
Infrared spectroscopy has emerged as a premier experimental technique to probe enigmatic effects arising from strong correlations in solids. Here we report on recent advances in this area focusing on common patterns in correlated electron systems including transition metal oxides, intermetallics and organic conductors…
A novel method coupling the Langmuir-Blodgett (LB) deposition of silica particles and the formation of a self-assembled monolayer (SAM) of alkylsilane is proposed for fabricating hydrophobic surfaces. The LB deposition and the SAM are supposed to confer the substrate surface roughness and low surface energy, respectiv…
The use of nanoparticles for the fabrication of new functional ceramics and composites often requires the preparation of concentrated fluid suspensions. However, suspensions containing nanoparticles are limited in solids content because of the excluded volume formed by the dispersant adlayer around the particles. We i…
A system is reported for evaporation-controlled crystal growth of potassium dihydrogen phosphate (KDP) from aqueous solution by the Sankaranarayanan−Ramasamy (SR) method. KDP (KH 2 PO 4 ) single crystals of 10-, 20-, and 40-mm diameter and 60-mm height have been grown at an average growth rate of 5 mm/day from the poi…
The band structure of the low-temperature thermoelectric material, $\mathrm{Cs}{\mathrm{Bi}}_{4}{\mathrm{Te}}_{6}$, is calculated and analyzed using the semiclassic transport equations. It is shown that to obtain a quantitative agreement with measured transport properties, a band gap of $0.08\phantom{\rule{0.3em}{0ex}…
Fully dense Si 3 N 4 sintered with rare‐earth (RE=La, Nd, Gd, and Yb) oxide additives were fabricated by hot pressing. They were mainly composed of the α‐phase, which enabled the investigation of the α–β transformation kinetics without the effect of porosity. The phase transformation kinetics was found to be linear. T…