Materials Literature
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Abstract A morphological study of hydroxypropyl cellulose (HPC) was performed on solid films prepared by casting from a liquid‐crystalline aqueous solution at rest or under shear. Electron microscopic observations reveal that many round particles composed of stacked disks are densely packed in the interior of a quiesc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of binary blends of narrow molecular weight distribution polystyrenes. 2Hiroshi Watanabe, Takashi Sakamoto, and Tadao KotakaCite this: Macromolecules 1985, 18, 5, 1008–1015Publication Date (Print):May 1, 1985Publication History Published online1 May 2…
The ground state of the Si2C molecule is found to be a closed-shell C2v symmetry structure with unusually short Si–C bonds. In these theoretical studies a double zeta plus polarization (DZ+P) basis set was used initially. At the self-consistent-field (SCF) level of theory the DZ+P C2v symmetry structure collapses to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe generation and trapping of the high-temperature oxosilyliumyl cation radicals (28SiO+ and 29SiO+) in neon matrixes at 4 K; an ESR and ab initio CI theoretical investigationLon B. Knight Jr., A. Ligon, R. W. Woodward, David Feller, and E. R. DavidsonCite this: J. Am. Chem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet and triplet potential surfaces for the nickel-ethylene [Ni(C2H4)] complex. A CASSCF-CI studyPer Olof Widmark, Bjoern O. Roos, and Per E. M. SiegbahnCite this: J. Phys. Chem. 1985, 89, 11, 2180–2186Publication Date (Print):May 1, 1985Publication History Published onli…
Abstract Numerous copolymerizations of glycolide with β‐propiolactone, γ‐butyrolactone or δ‐valerolactone were conducted either in bulk or in nitrobenzene solution at temperatures in the range of 20 to 150°C. Three classes of catalysts were used, namely acidic catalysts initiating cationic polymerizations, complexing…
Studies of the kinetics of crystallization were performed on polyethylene-naphthalene-2,6-dicarboxylate (PEN) and onits copolyester with p-hydroxybenzoic acid (PHB). It is shown that PEN crystallizes in two different crystal modifications. The copolyester forms a lattice which corresponds to one of the two crystal mod…
We have found a cII-dependent promoter, PaQ, within the Q gene of bacteriophage lambda. Transcription experiments and abortive initiation assays performed in vitro showed that the promoter strength and the cII affinity of PaQ were comparable to the other cII-dependent lambda promoters, PE and PI. The location and left…
Deviations from Kleinman symmetry for the second hyperpolarizability tensors of some simple atoms and molecules (He, Ar, Kr, Xe, ${\mathrm{CH}}_{4}$, ${\mathrm{CF}}_{4}$, ${\mathrm{SF}}_{6}$, ${\mathrm{H}}_{2}$, ${\mathrm{D}}_{2}$, ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, ${\mathrm{CO}}_{2}$, ${\mathrm{C}}_{2}$${\mathr…
Studies are reported on tensile and impact properties of several binary and ternary blends of polypropylene (PP), styrene-b-ethylene-co-butylene-b-styrene triblock copolymer (SEBS), high-density polyethylene (HDPE), and polystyrene (PS). The blend compositions of the binary blends PP/X were 10 wt % X and 90 wt % PP, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of red ferryl [(FeIVO)2+] porphyrin complexes to green ferryl [(FeIVO)2+] porphyrin radical complexesAlan L. Balch, Lechoslaw Latos-Grazynski, and Mark W. RennerCite this: J. Am. Chem. Soc. 1985, 107, 10, 2983–2985Publication Date (Print):May 1, 1985Publication His…
The kinetics of starch gelatinization in potatoes was determined by a dynamic DSC method. The results were verified by an isothermal method. Experiments were carried out on small portions of potato tissue, thus assuring that the gelatinization conditions obtained were representative of the sum of the processes occurri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSix- and five-vertex organometallic clustersJean Francois Halet, Roald Hoffmann, and Jean Yves SaillardCite this: Inorg. Chem. 1985, 24, 11, 1695–1700Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue 1 May 1985https://pubs.ac…
The static solitons of the square-rectangular martensitic transformation are obtained with the use of higher-order elasticity theory; both first-order (rectangular-rectangular and square-rectangular solitons) and second-order (rectangular-rectangular only) phase transitions are treated. The shear and dilatational stra…
The relative intensities of the lcr1, Lgy L/z, LB3, and .L71 lines were measured using ten R.EE phosphates. These data were used to calculate peak-overlap corrections for the Lal and Lp1 lines of RE'8. Wavelength-dispersion and energy-dispersion specfia of the Z lines of fourteen R.EE compare favorably with the spectr…
Abstract The thermally stimulated‐current method (TSC) has been employed to determine the temperatures and intensities of T β , T g , and T > T g for pure isotactic, pure syndiotactic, and five atactic specimens with syndiotactic triad content from 49.5 to 75%; T g was found to increase linearly with syndiotactic t…
X-ray photoemission spectroscopy has been used to investigate the chemical bonding and reactivity of the Al–polyimide interface. At 300 °C substrate temperature, initial deposition of Al reacts with polyimide up to about 3.5 ml. The reaction occurs mainly with the carbonyl group, resulting in the formation of an inter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganophosphazenes. 18. Friedel-Crafts phenylation reactions of alkyl- and (dimethylamino)fluorocyclotriphosphazenesChristopher W. Allen, Scott Bedell, William T. Pennington, and A. Wallace CordesCite this: Inorg. Chem. 1985, 24, 11, 1653–1656Publication Date (Print):May 1,…
The contribution of the occluded polystyrene in the crosslinked rubber gel to the overall swelling has been determined theoretically and experimentally. Theoretical calculation consists of modification of the Flory–Rehner equation. The equation describes the swelling of a crosslinked polymer network in the presence of…
Thermal conductivities (k,keff) have been estimated for sintered and sphere-pac Li2O and γ-LiAlO2 with and without neutron irradiation effects. The estimation is based on (a) data from unirradiated UO2, Li2O, and γ-LiAlO2; (b) data from irradiated dielectric insulator materials; and (c) relatively simple physical mode…