Materials Literature
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This article provides a method to obtain high-hoop-strength high-density polyethylene (HDPE) pipe by mandrel-rotating extrusion. With properly selected processing temperature, pressure, and mandrel-rotating speed, the hoop strength of 90 Mpa has been got. Differential scanning calorimetry and X-ray scattering found th…
Size-quantized CdS nanocrystals of controlled dimensions are synthesized within monodisperse egg lecithin vesicles made by detergent depletion. Cryo-transmission electron microscopy (cryo-TEM) enables imaging in situ both of the vesicle wall and of the encapsulated nanocrystal. Cryo-TEM images confirm that only one pa…
Polystyrene surfaces have been modified by poly( N -isopropylacrylamide) (PIPAAm) grafting. Beside observing the adhesion and the effect of low-temperature treatment on anchorage-dependent cells, the wetting behavior of PIPAAm-grafted surfaces was studied by dynamic contact angle measurement by Wilhelmy microbalances.…
Environmental scanning electron microscopy is a technique capable of imaging fluid systems in their natural state without prior specimen preparation. As such, it is potentially a very powerful tool for studying emulsion structures at a resolution significantly higher than that for conventional optical microscopy. We p…
The liquid-phase oxidation of eight fuels and a series of 1:1 blends has been studied at elevated temperature and pressure to simulate some of the chemical-reaction conditions that cause surface fouling in aircraft fuel lines. The time, t, needed to deplete dissolved O 2 by 50% was determined for each blend and compon…
Free-radical solution terpolymerization of acrylamide, acrylic acid, and acrylonitrile was carried out in a mixture of dimethylformamide and water (60 : 40,v/v) at 85°C using benzoyl peroxide as the initiator. The polymers were characterized by elemental analysis, IR, 1H-NMR, TGA, and viscosity measurements. Elemental…
A series of rigid interpenetrating polymer network (IPN) foams, based on a rosin-based polyurethane and an epoxy resin, were prepared by a simultaneous polymerization technique. The changes in the chemical structure, dynamic mechanical properties, and morphology of the rigid IPN foams were investigated by Fourier tran…
Reactions of vinyl trimethoxysilane grafting onto low-density polyethylene (LDPE) were investigated using Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermal gravimetric analysis. The silane grafting reactions were induced by a fixed amount of dicumyl peroxide at 0.2 part of reagent…
Conducting polymers with very small band gaps have been prepared by the electrochemical copolymerization of 4-dicyanomethylene-4 H -cyclopenta[2,1- b;3,4- b ‘]dithiophene ( 1 ) with 3,4-ethylenedioxythiophene ( 2 ). Strong evidence that the materials formed are true copolymers rather than polymer blends is obtained fr…
Alkyl 2-naphthyl ethers are an important class of precursors for the manufacture of fine chemicals useful as perfumery and pharmaceutical chemicals. The efficacy of solid acid catalysts such as acid-treated clays (Filtrol-24 and K-10), heteropolyacids (dodecatungstophosphoric acid, dodecatungstosilicic acid, dodecapho…
A new procedure for the preparation of nanosized In(OH) 3 particles in high concentrations without added surfactants is described. The process is based on the peptization of In(OH) 3 dispersions consisting of micrometer colloids, which are obtained by the hydrolysis of InCl 3 in ethylene glycol to which aqueous sodium…
Atomic force microscopy (AFM) and X-ray reflectivity (XR) have been used together to provide a detailed and direct look at the structure of human serum albumin protein adsorbed onto well-characterized self-assembled monolayer (SAM) surfaces at several protein concentrations. The duration of SAM deposition was also var…
A polyamide 6 (PA 6)/silica nanocomposite was obtained through a novel method, in situ polymerization, by first suspending silica particles in ϵ-caproamide under stirring and then polymerizing this mixture at high temperature under a nitrogen atmosphere. The silicas were premodified with aminobutyric acid prior to the…
Jute fibers were chopped to approximately 100 mm in length and then processed through a granulator having an 8-mm screen. Final fiber lengths were up to 10 mm maximum. These fibers along with polypropylene granules and a compatibilizer were mixed in a K-mixer at a fixed rpm, 5500, and dumped at a fixed temperature, 39…
Jute fibers were chopped to approximately 100 mm in length and then processed through a granulator having an 8-mm screen. Final fiber lengths were up to 10 mm maximum. These fibers along with polypropylene granules and a compatibilizer were mixed in a K-mixer at a fixed rpm, 5500, and dumped at a fixed temperature, 39…
A series of dual polymer electrochromic devices (ECDs) based on 12 complementary pairs of conducting polymer films have been constructed using 3,4-ethylenedioxythiophene-containing conducting polymers. Poly[3,6-bis(2-(3,4-ethylenedioxythiophene))- N -methylcarbazole] (PBEDOT-NCH 3 Cz), poly[3,6-bis(2-(3,4-ethylenediox…
Efficacious metal control of self-assembly of dialkylketipinate dianions leads to completely different supramolecular assemblies. The structures of grid 1, double-decker 2, triple-decker 3, and metalla-spherand 4 were characterized by X-ray crystallographic analyses or by NMR spectroscopy.
Crystallization in an electric field leads to highly stable films of tetranitrotetrapropoxycalix[4]arene (shown on the right) with second-order nonlinear optical properties. The ordered noncentrosymmetric packing of the molecules in these films was elucidated by a combination of X-ray diffraction, angle-dependent seco…
A short discussion of theoretical calculations of the optical properties of quasi-one and quasi-bidimensional molecular crystals is presented. Special attention is devoted to the electron–molecular vibration coupling which is analyzed in charge-transfer salts with tetrathiafulvalene (TTF) derivatives (including giant…
A lubrication analysis is presented for the near-contact axisymmetric motion of spherical drops covered with an insoluble non-diffusing surfactant. Detailed results are presented for the surfactant distribution, the interfacial velocity, and the gap width between the drop surfaces. The effect of surfactant is characte…