Materials Literature
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Polymerization of racemic α-methyl-β-propiolactone (MPL) was carried out using Zn-, Sn-, La-, Y-. and Al-based organometallic catalysts. It was found that Zn(C 2 H 5 ) 2 /H 2 O (1/0.6), ( n C 4 H 9 ) 2 Sn(OCH 3 ) 2, Al(O i C 3 H 7 ) 3, and (C 2 H 5 ) 2 AlOC 2 H 5 produced atactic poly(α-methyl-β-propiolactone) (PMPL),…
Abstract The phase separation states of hemicellulose and lignin in their blends were investigated by means of contact angle measurements. The hysteresis behavior in dynamic contact angles suggested that a phase separation of cluster‐state type (not of random dispersion type) took place at hemicellulose‐rich and ligni…
The miscibility of the carbosilane analogue of poly(α-methylstyrene), poly(methylphenylsilylenemethylene), named poly(sila-α-methylstyrene) (PSiαMS) with an M w value of 188 000 and polystyrene (PS) having different molecular weights is investigated using DSC and cloud point measurements. The observed miscibility beha…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Flash Point Value for n-Dodecane Based on the Manual Pensky−Martens Closed Cup Method (ASTM D-93)Janet M. Hughes, Dennis R. Hardy, and Erna J. BealView Author Information Geo-Centers, Inc., Indian Head Highway, Ft. Washington, Maryland 20744 Naval Research Laboratory…
The study of the photooxidation mechanism of crosslinked polyesters used for flat steel coating can be based on the analysis of photoproducts at the molecular scale: these photoproducts are formed in the matrix under exposure in an accelerated photoageing chamber SEPAP 12–24. Hydroxy functionalized aliphatic polyester…
Several thermoplastics and an epoxy were exposed to a variety of conditions to determine the effect of chemical environment on the materials. Weight gain measurements of the samples were made after exposure to low humidity, ambient air, 90/spl deg/C air, ambient transformer oil, and 90/spl deg/C transformer oil. Two m…
Summary The purpose of this study was to investigate effects of aluminium in the Zn coating on electrode life in welding galvanized steel sheet. Three hot‐dip galvanized and one electro‐galvanized steel sheet types were prepared for this study. Aluminium content in the coatings varied within the range 0.26–0.87 mass%…
A series of unsupported nickel–copper catalysts with various Ni/Cu ratios has been prepared by coprecipitation and characterized by thermomagnetometry, (TM), temperature programmed reduction (TPR) and oxidation (TPO) and scanning electron microscopy (SEM). It was found that the magnetization of the nickel–copper catal…
Structure and mechanical properties of the intermetallic compound NiMn alloyed by Ti and Al have been studied using optical and transmission electron microscopy, X-ray diffraction and dilatometry. Alloying has been found to reduce the temperature of β ↔ θ martensitic transformation, the martensite tetragonality and th…
The protonation of 2,3-dimethoxy-5-methyl-1,4-benzoquinone (UQ 0 ) has been determined to improve the quantum efficiency of charge separation between a zinc meso-tetra(4-sulfonatophenyl)porphine (MP) donor and UQ 0 (UQ 0 H + upon protonation) acceptor system. The primary effect of protonation is to increase the drivin…
The cyclo cocondensation of triethylenetetramine with arylpyruvaldehydes is templated by iron(III) chloride, to give a [12]aneN4 type diimine complex intermediate which may be reduced and demetallated in situ with sodium borohydride giving the saturated [12]aneN4 metal-free macrocycle in up to 60% overall yields; phot…
In the coordination field calculation of rare-earth ions, the D 2 point group basis functions were classified and labeled according to the relation of the point group chain R (3)* ⊃ O * ⊃ ⊃ The perturbation matrix elements of the coordination field for the rare-earth complexes in the dihedral field were systematically…
Tribological behavior was evaluated for polyolester base oil and the formulated oils in some HFCs and HCFC refrigerants environment. HFCs as well as R-22 showed the boundary lubricating effect depending upon the solubility of gas in the oil. Thus, higher gas pressure of the refrigerants improved the wear resistance. A…
The phase behavior of ( S )-ovalbumin in aqueous ethanol and (NH 4 ) 2 SO 4 solutions (pH 7.0) was investigated for temperatures ranging from 20 to 90 °C. The various morphologies observed were presented on ternary phase diagrams. At 20 °C, three morphologies were observed in aqueous ethanol: one-phase liquid, one-pha…
Effects of various boride former elements (Ta, W, Nb, Ti, Mo) and/or B on recovery and recrystallization of reverse-transformed austenite were examined in carbon-free Fe-19mass%Ni alloys. The combined addition of Nb and B was found to be the most effective in suppressing them; the recrystallization temperature of the…
Methionine is one of the 20 amino acids, and one of the two sulfur-containing amino acids. Observations of chemical shifts in various constituents of methionine are important in determining its interaction with a surface in a thin film. As such, spectra of bulk films of methionine, as in this work, serve as a baseline…
Commercial polypropylene pipes for water transport were aged in air at 135 °C and in water at 95 °C for up to 3000 and 4000 h respectively. The protection effect of the antioxidant in the polymer was investigated by measuring the oxidation induction time (OIT) and by determining the chemical changes in the aged polyme…
The powder of supersaturated solid solution of Al-7.8 at%Ti-0.3 at%Fe with a nanocrystalline structure was prepared by mechanical alloying, and it was compacted to columnar shape material at low temperature by application of high pressure of 3 GPa. Diffusion of copper was studied in this compacted nanocrystalline mate…
The NZP family, which gets its name after the prototype composition NaZr2P3O12, has received much attention in recent times because of their very low coefficient of thermal expansion (CTE), controlled lattice thermal expansion anisotropy, fast ionic conductivity, high thermal and chemical stability and flexibility tow…
The behavior of surface and trapped charge that originates during contact electric-field poling of thin films of optically nonlinear polymers has been investigated. Thin films of poly(methyl methacrylate) doped with two different tricyanothiophene chromophores have been studied during and after the poling process by s…