Materials Literature
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Nanostructural evolution and phase transformation in supported and unsupported titania membranes have been studied using Raman spectroscopy, X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). Densification of unsupported membranes started at ca. 450 °C and reached more than 97% density a…
The synthetic conditions of amorphous calcium carbonate such as initial concentration of reactant, temperature and pH in the reaction of CaCl2-Na2CO3-NaOH system, and its crystallization in water and NH4Cl solution were investigated. Characteristics of the amorphous phase were determined by means of X-ray diffraction,…
Protonated emeraldine [poly(aniline)] has been encapsulated in MoO3 by first inserting aniline into its lattice followed by successful polymerization with (NH4)2S2O8; the new material is characterized by X-ray diffraction, IR spectroscopy, scanning electron microscopy and charge transport measurements.
Poly(ethylene glycol) (PEG) has been grafted to polystyrene using branched poly(ethylene imine) (PEI) as an anchoring polymer. A dense grafting of PEG chains is obtained if a PEG-PEI adduct is first prepared by treatment of PEI with PEG epoxide and the adduct subsequently adsorbed on an oxidized polystyrene surface. P…
Industrial Microencapsulation: Polymers for Microcapsule Walls Design Of Polymeric Drug Delivery Systems for Controlled Release of Antitumour Drugs The Use of Gelatin and Alginate for the Immobilization of Bioactive Agents Microcapsules for Multiple Emulsions Biodegradable Microspheres for Controlled Drug Delivery Nan…
This paper consists of two parts. First, an electrical model circuit is proposed that can reproduce, with high accuracy, the small-amplitude impedance behaviour of conducting-polymer electrodes in electrolyte solutions. Secondly, the electronic structure of the metal/polymer/solution interphase is discussed in terms o…
Luminescence from the oxygen-to-metal (O → M) ligand-to-metal charge-transfer (l.m.c.t.) triplet states for polyoxometalates of tungsten and molybdenum was observed below 100 K. The Stokes shift was large and the time profile of the emission decay approximated two exponential decays at all temperatures. The emission y…
Different alkenes are epoxidized with high selectivity in the presence of manganese(III) tetraphenylporphyrin–imidazole–sodium periodate–tetrabutylammonium bromide system in CH2Cl2–H2O media, with high yields (80–100%) at room temperature.
The thermal decomposition of 3,5-dihydroxybenzoyl azide, to generate in situ the corresponding AB2-type dihydroxy isocyanate monomer, was found to give hyperbranched polyurethanes, whose structures were established using IR and NMR spectroscopy.
We present the results of our investigations on the electrooptic properties of the smectic O and O* phases of m7tac (1-methylheptyl terephthalylidene-bis-4-aminocinnamate). At low voltages, we observed striking electrochromic effects and, in O* at high voltages, a field induced phase transition. Freely suspended thick…
Polyaniline serves as a synthetic metal catalyst with reversible redox under oxygen to induce dehydrogenative and/or decarboxylative oxidation of benzylamines and 2-phenylglycine into the corresponding imines and, in combination with copper(II) chloride or iron(III) chloride, dehydrogenation of cinnamyl alcohol into c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDye diffusion in isotropic and liquid-crystalline aqueous (hydroxypropyl)celluloseMazidah B. Mustafa, Debbie L. Tipton, Mary D. Barkley, Paul S. Russo, and Frank D. BlumCite this: Macromolecules 1993, 26, 2, 370–378Publication Date (Print):January 1, 1993Publication History…
A novel degradative procedure for the determination of the degree of branching in hyperbranched macromolecules is presented, and its versatility and scope are demonstrated with the synthesis and characterization of hyperbranched polyesters based on 4,4-bis(4′-hydroxyphenyl)pentanoic acid.
This paper is concerned with a system of nonlinear partial differential equations, in short, the coupled Cahn-Hilliard equations, which consists of a fourth order quasilinear parabolic equation and a second order quasilinear parabolic equation. This system was recently derived by Penrose and Fife and also by Alt and P…
Analyses on the effects of polymeric N-acetyl-D-glucosamine (chitin), which was obtained from squid pen, on histiogenic activation in dogs were carried out with subcutaneous implants (5 x 5 cm2) of polyester non-woven fabric (NWF) supplemented with chitin (chitin group) and NWF (control group). These materials were im…
From our research for novel non-linear optical (NLO) materials for frequency doublers and optical modulators we report on new ferroelectric liquid crystals, which for the first time, exhibit second order NLO coefficients (for example d 22 = 5 pm V−1, which are comparable to those of state of the art inorganic NLO mate…
Enzymatic ring-opening copolymerization of lactones was carried out by using Pseudomonas fluorescens lipase in bulk. In the copolymerizaton of ε-caprolactone (ε-CL) and δ-valerolactone at 60°C for 10 days a copolymer with molecular weight of 3.7×103 was obtained and its structure was found to be of random structure ha…
Cellulosic materials have long been used as cost-cutting fillers in the plastic industry. Among the various factors which determine the final performance of the composite materials depend, to a large extent, on the adhesion between the polymer matrix and the reinforcements, and, therefore, on the quality of the interf…
The microstructure development of a ceramic composite material fabricated by active‐filler‐controlled polymer pyrolysis (AFCOP) was investigated. During heating of a polysiloxane precursor mixed with titanium powder in argon atmosphere up to 1400°C, thermally induced decomposition of the polymer phase is combined with…
T. Okada, Analyst, 1993, 118, 959 DOI: 10.1039/AN9931800959