Materials Literature
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A phthalocyanine derivative having eight 2-thienyl substituents at the β-position was synthesized and electrochemical oxidation of the phthalocyanine gave an insoluble polymer film on the electrode surface.
Common physicomechanical tests comprising impact strength, the melt flow index (MFI), and the yellowness index (YI) were used to study the thermooxidative stability of polypropylene (PP) following multipass extrusion. Differential scanning calorimetry (DSC) coupled with chemiluminescence (CL) monitoring was also used…
An intercalated material has been prepared consisting of a regular alternation of organic/inorganic layers. The products were obtained by reacting 3,4-dihydroxyphenylalanine (DL-DOPA) with V2O5·nH2O gel, which underwent an oxidative polymerization/intercalation process, forming a dark blue metallic colored film. The f…
We report a molecular dynamics (MD) study on M3+ lanthanide and M2+ alkaline-earth complexes of ethylenediaminetetraacetate tetraanion (EDTA4−) in aqueous solution. First, a consistent set of Lennard-Jones parameters for La3+, Eu3+ and Lu3+ cations has been derived from MD and free energy calculations. It reproduces t…
The transition from isolated and finite oxygen vacancy clusters in disordered cubic perovskites to structures containing infinite chains of oxygen vacancies in an ordered arrangement was investigated by a combined Mössbauer spectroscopy, X-ray and electron diffraction and high-resolution transmission electron microsco…
The dynamic crosslinking of butadiene-acrylonitrile copolymer (NBR) with polyamide 6 thermoplastic elastomer are studied. The effect of curing systems and the amount of curing agent are described. It is found that the NBR/PA6 60/40 ratio and phenolic curing system have a significant effect on the physical, mechanical,…
A mechanism of light emission from a single bubble sonoluminescence (SBSL) was formulated by assuming that the source for the light emission is bremsstrahlung in partially ionized gases. This emission mechanism turns out to be same as the black body radiation with finite absorption, which confirms that the principal m…
Studies on the synthesis, singlet oxygen and fluorescence yields and pharmacokinetic properties of three different dimeric porphyrins with an amide linkage (D2-D4) are described and compared with the results recently reported for a dimeric porphyrin (D1). The pharmacokinetic behavior of all dimers were examined in Bal…
The sol‐gel route was used for the preparation of Fe/V oxide films with a molar ratio Fe:V = 1:2. Transmission electron microscopy (TEM) measurements of films prepared at 300°C showed that the films consist of a FeVO 4 ‐ II phase with the grains (1 nm) embedded in an amorphous phase. TEM measurements of films heated a…
Vulcanization of carboxylated nitrile rubber (XNBR) with a mixed system based on zinc peroxide and sulphur accelerators produces materials with favourable mechanical properties because of the formation of ionic aggregates which give the vulcanized compounds a certain rigidity. These properties are drastically reduced…
The high-performance fluorinated polymers have been receiving considerable attention as interesting advanced materials. The incorporation of fluorine atoms into polymer chains leads to polymers with increased solubility, flame resistance, thermal stability and glass transition temperature while also leading to decreas…
A series of polyurethane (PU) emulsions modified with aminosilicone were synthesized, based on 2,4-toluene diisocyanate (TDI), poly(tetramethylene oxide) (PTMO), and dimethylolpropionic acid (DMPA) as a prepolymer which was chain-extended with aminoethylaminopropyl polydimethylsiloxane (AEAPS) in an aqueous emulsion.…
Lithium metal added to a solution of 4-neopentoxyphthalonitrile in 1-octanol or other long-chain primary alcohols at room temperature resulted in phthalocyanine formation at a reasonable rate in good yield, while preformed lithium 1-octanolate under the same conditions gave 2,9,16,23-tetraneopentoxyphthalocyanine, but…
We report the effect of microphase-separated structure on the mechanical and thermal properties of several poly(1,3-cyclohexadiene-block-butadiene-block-1,3-cyclohexadiene) triblock copolymers (PCHD-block-PBd-block-PCHD) and of their hydrogenated derivatives: poly(cyclohexene-block-ethylene/butylene-block-cyclohexene)…
Two approaches were employed in the syntheses of four 1,4,7-tris(carboxymethyl)-10-(2-hydroxyalkyl)-1,4,7,10-tetraazacyclododecanes (4) with alkyl chain lengths from 4 to 16 carbons. Physicochemical properties, such as critical micelle concentration (CMC), micelle size, partition coefficient (P) between water and octa…
Simple transition-metal salts were investigated as the catalysts for the partial oxidation of methane. In trifluoroacetic acid (TFA), methane could be efficiently converted to methyl trifluoroacetate by the Cu(OAc)2/K2S2O8 catalyst system. A quantitative yield (96.3%) based on methane has been obtained under the optim…
Conductimetry was used for monitoring the radical polymerization of a weak electrolyte (acrylic acid) in aqueous solution and for determination of the kinetic parameters of the reaction (reaction order with respect to monomer, activation energy). The results obtained were consistent with those determined by other tech…
Long-time self-diffusion and sedimentation of fluorescent tracer spheres in electrostatically stabilized dispersions of rigid colloidal host rods have been measured in situ with fluorescence recovery after photobleaching, and gravitational and ultracentrifugal sedimentation. The dynamics of silica tracer spheres of 39…
The effect of high boiling point solvent on the residual stress behaviors of semiflexible structure poly(4,4′-oxydiphenylene pyromellitimide) (PMDA-ODA) and pseudo-rodlike poly(p-phenylene biphenyltetracarboximide) (BPDA-PDA) polyimide was investigated. As a solvent, a mixed solution of 20 wt % cyclohexyl-2-pyrrolidon…
Structure–property relationships were studied in a series of hyperbranched polyesters based on dimethoxypropionic acid with ethoxylated pentaerythritol as the core. In DSC thermograms, all the polyols exhibit a prominent glass transition and a small melting endotherm. It is possible to model the glass transition tempe…