Materials Literature
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Abstract Viscoelastic properties of uncrosslinked 1,2‐polybutadiene (91.5% vinyl, 7.0% cis , 1.5% trans , number‐average molecular weight 99,000) were studied by dynamic shear measurements between 0.15 and 600 cps (torsion pendulum and Fitzgerald transducer) and shear creep measurements over time periods up to 3.7 × 1…
The amino acid composition of subtilisin Carlsberg has been determined and is in good agreement with the 274 residues found by sequence studies in the protein.From a tryptic hydrolysate, it was possible to resolve the peptides into a series of fractions by gradient elution from Dowex 50.After further purification, the…
Abstract A study was made of the gamma‐ray‐induced copolymerization of tetrafluoroethylene and 3,3,3‐trifluoropropene. Copolymerizations were carried out at 100°C. and 5000 atm. pressure and at 21°C. and various pressures up to 8000 atm. The reactivity ratios calculated from the composition data indicate that the prop…
Abstract Hyperelectronic polarization may be viewed as the electrical polarization in external fields due to the pliant interaction with the charge pairs of excitons, in which the charges are molecularly separated and range over molecularly limited domains. It is particularly pronounced in molecular solids composed of…
It is shown that the threshold of rectified diffusion according to the Hsieh and Plesset solution is in fact frequency dependent when the inertial terms in the equation of motion of the bubble are not neglected. A comparison is made between the threshold calculated from the modified Hsieh and Plesset solution and that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGaseous Diffusion and Flow in Commercial Catalysts at Pressure Levels above AtmosphericC. N. Satterfield and P. J. CadleCite this: Ind. Eng. Chem. Fundamen. 1968, 7, 2, 202–210Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue…
The action of sodium nitrite as a corrosion inhibitor for mild steel in neutral aqueous solution has been studied in relation to the surface preparation of the steel, the presence of aggressive salts in the solution, and temperature. Surface preparation of mild steel has little effect on the minimum concentration of n…
Abstract Electron and phase microscopy results show that most elastomer blends are heterogeneous, even after extended mixing. Blends of SBR/BR and SBR/EBR, however, are homogeneous. DTA data support these conclusions. Carbon black distribution studies indicate that carbon black does not transfer between elastomers dur…
Interferometric study of OH emission source in W3 /IC 1795/ region, processing data on digital computer
Abstract The spontaneous polymerization of hydroxymethacrylate monomers by the layer aluminosilicate montmorillonite is reported. Saturation of montmorillonite by acrylic monomers gives interlayer complexes of three types, only one of which is susceptible to spontaneous polymerization. Electron‐donating sites situated…
The dielectric relaxation in NaNO 2 is analyzed on the basis of the time dependent statistics of the Ising system, where the Ising variable corresponds to two stable orientations of the polarization carried by each molecular unit. The dynamical susceptibility is calculated with the random phase approximation in terms…
The theory of electronic Raman scattering for trivalent rare-earth ions in crystals is formulated in a general way. It is shown that vibronic coupling is unimportant. The antisymmetric part of the scattering tensor, which vanishes for vibrational Raman scattering, turns out to be dominant for several electronic Raman…
Poly-beta-hydroxybutyrate (PHB) from various representative strains of the genera Azotobacter, Beijerinckia, and Derxia was isolated and characterized. During growth in shake culture, with glucose as a carbon and energy source, and molecular nitrogen as a nitrogen source, increase in dry weight appeared linear, and PH…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the reaction of cobalt(III) and iron(III) hematoporphyrin with cyanide and thiocyanate. Evidence for a dissociative mechanismEverly B. Fleischer, Simone Jacobs, and Louis MestichelliCite this: J. Am. Chem. Soc. 1968, 90, 10, 2527–2531Publication Date (Print):May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton magnetic resonance spectra of pentofuranose derivativesJohn D. Stevens and Hewitt G. Fletcher Jr.Cite this: J. Org. Chem. 1968, 33, 5, 1799–1805Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.a…
The theoretical and experimental principles of a method are described, which permits an approximate evaluation of the absorption correction by intensity measurements with the aid of a four-circle diffractometer.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCritical temperature and coexistence curve for aluminum bromideJ. W. Johnson, W. J. Silva, and Daniel CubicciottiCite this: J. Phys. Chem. 1968, 72, 5, 1664–1668Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968http…
Concentration quenching of the 1.06-micro Nd(3+) fluorescence in glass is investigated to help determine the nature of the Nd(3+)-Nd(3+) interaction that causes quenching. The relative fluorescent efficiency vs Nd(3+) concentration is measured for thin, polished plates of glass in an apparatus designed to minimize ins…
Studies of nylon 6 of various relative lengths have been made by measuring the sonic modulus and length as functions of temperature from -50°C to 180°C. Conclusions based on these data indicate that the transition of dry nylon 6 yarn from a glass to rubberlike material takes place in two discrete steps, one centering…
Electrical resistivity of vanadium dioxide single crystals undoped and iron-doped was determined as a function of temperature around the transition temperature in the a monoclinic and a perpendicular directions. Results of this experiment indicated a greater resistivity in the a perpendicular direction than in the a p…