Materials Literature
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Abstract In a continuation of previous work (1), the melting and crystallization behavior of the layered oxidized skin on thermally oxidized inner wall surfaces of different high density polyethylene (HDPE) pipes was studied. By hot stage polarized light microscopy on 5 μm thick cross‐sections of the skin, melting was…
The amplitude equation for thermal convective nematic liquid crystals is derived from the equations of motion. The appearance of various patterns (normal rolls, undulations, zigzags, etc.) in different parameter regimes is described in a unified manner. The effect of a horizontal magnetic field is included and the cor…
An improvement of the classical theory of extinction in mosaic crystals is made by starting from the energy transfer equations valid for a general-type crystal according to Zachariasen's [Acta Cryst. (1967), 23, 558-564] classification. Within the assumption that only the integrated intensity of the diffraction peak i…
Both native and regenerated (rayon) cellulosic fibers are potential reinforcing elements in rubbers due to their relatively good mechanical properties, suitable aspect ratio, low cost and low density. The properties of the cellulosic fibers can also be changed fairly easily by chemical treatment. The effects of two tr…
Mercury Hexaselenidohypodiphosphate Hg 2 P 2 Se 6 has been prepared and its vibrational spectrum recorded. The observed frequencies of Hg 2 P 2 Se 6 are assigned on the basis of P 2 Se 6 4- units with C 2h symmetry. DTA data have been determined and interpreted.
Abstract Measurements of the electron spin—lattice relaxation time T 1 and the phase memory time T M of SeO 2 − centres in X‐irradiated single crystals of ferroelastic KH 3 (SeO 3 ) 2 are reported. At temperatures above 11 K the spin—lattice relaxation is governed by a two‐phonon process of optical phonons. Near the p…
Abstract The liquid-phase hydration of acrylonitrile to acrylamide has been examined over various metal catalysts at 75 °C. Five metal elements-Cu, Ag, Fe, Co, and Ni-showed the catalytic conversion of acrylonitrile. The Cu and Ag catalysts gave the acrylamide with a 100% selectivity, while the other metals, Fe, Co, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe 1,1'-ethylenebis[4-(methoxycarbonyl)pyridinyl] diradical and its photosensitive cyclomersYusaku Ikegami, Takashi Muramatsu, Kaoru Hanaya, Shinji Onodera, Norio Nakayama, and Edward M. KosowerCite this: J. Am. Chem. Soc. 1987, 109, 10, 2876–2880Publication Date (Print):Ma…
Europium Hexathiohypodiphosphate Eu 2 P 2 S 6 with Eu in the oxidation state 2 has been prepared by direct elemental synthesis at high temperatures. Its vibrational spectrum has been recorded. The observed frequencies are assigned on the basis of P 2 S 6 4- units with C 2h symmetry in the crystal in analogy to Sn 2 P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic characterization of the .alpha. .dblharw. .beta. crystalline phase transition in poly(butylene terephthalate) and its copolymers with poly(tetramethylene oxide)Eva Dobrovolny-Marand, Shaw Ling Hsu, and C. K. ShihCite this: Macromolecules 1987, 20, 5, 1022–1029P…
Abstract The devolatilization mechanism of polystyrene was studied by scanning electron microscopy. Strands of molten polystryene, containing 2,300 ppm styrene, and molten polystyrene containing 5% pentane, were extruded into a heated vacuum chamber. The strands were abruptly frozen, then fractured under liquid nitrog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron transport in poly(3-vinyl-10-methylphenothiazine) filmsYotaro Morishima, Isao Akihara, Hak Sang Lim, and Shunichi NozakuraCite this: Macromolecules 1987, 20, 5, 978–983Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissu…
Thermal plutonium recycling has been demonstrated by Kraftwerk Union AG/Alkem on a large scale since 1972 in power plants at Obrigheim and Gundremmingen, Federal Republic of Germany (FRG). An improved mixed-oxide (MOX) fuel fabrication technology has been available since 1981. Such improved MOX fuel is currently being…
In this paper we report the mesomorphic behaviour of anhydrous N-4-hexadecylpyridinium chloride (HDPCI). DTA, X-ray and optical studies show that HDPCI exhibits smectic A phase above 76°C. Existence of lamellar phase in the mixtures of HDPCI and water, is reported using X-ray and optical studies.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfined star polymersA. Halperin and S. AlexanderCite this: Macromolecules 1987, 20, 5, 1146–1152Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987https://pubs.acs.org/doi/10.1021/ma00171a046https://doi.org/10.1021…
The orientational order parameters have been measured by deuteron N.M.R. of both solute (at low dilution) and solvent in various binary mixtures involving the liquid crystal 4,4′-di-n-heptylazoxybenzene (HAB). The solutes studied were azoxybenzene-d10 and n-heptylbenzene-d7 which are fragments of HAB, azobenzene-d 10…
Amorphous WO 3 or WO 3 or H 2 O is formed by hydrolysis of tungsten ethoxide. The temperature of hydrolysis influences the crystallization of WO 3 ·H 2 O. Tungsten hydrate (WO 3 ·H 2 O) has an orthorhombic unit cell with a=0.5235 nm, b = 1.0688 nm, and c=0.5123 nm. Orthorhombic WO 3 crystallizes at 350° to 500°Cfrom a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of styrene initiated by ultrasonic cavitationP. Kruus, D. McDonald, and T. J. PatraboyCite this: J. Phys. Chem. 1987, 91, 11, 3041–3047Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987https://pubs.ac…
Abstract A new diisocyanate, 1,4‐eyclohexane diisocyanate (CHDI), has been used in a series of polyether‐based polyurethane elastomers. The slightly opaque samples are semicrystalline in nature with high performance properties, including high softening temperature, very good thermal stability, high tensile and tear st…
Voltage/temperature phase diagrams of liquid-crystalline blue phase (BP) systems CB 15/M 18 and CB 15/E 9 have been determined by means of polarizing microscopy. Above a certain threshold voltage a field-induced BP occurs which is stable in a region of the U/T diagram between the BPI and BPII.