Materials Literature
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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.
The effects of adsorbed macromolecules (polymers) on certain transport coefficients of spherical particles are determined using methods of matched asymptotic expansions to solve the Stokes flow equations within and outside the polymer layer. The main advantage of this analysis is that it allows direct substitution of…
A long-period stacking structure of 9R, which has the stacking order ABC/BCA/CAB, has been found in ultrafine cobalt particles 20–500 nm in diameter. The structure seems to have resulted from the martensitic transformation of f.c.c. cobalt on cooling to room temperature. Electron microscopy reveals the existence of he…
Abstract Vertisols and Mollisols have developed from Quaternary pyroclastic deposits in central El Salvador under ustic moisture and isohyperthermic temperature regimes. Pellusterts generally occupy the nearly level constructional landforms (alluvial plains, coastal plains, and concave alluvial toeslopes), are poorly…
Abstract Gegenstand der Arbeit ist die Synthese von M etall s ilicat h ydraten (MSH) mit Schichtstruktur durch hydrothermale Kristallisation im ternären System M 2/n OSiO 2 H 2 O (M = Li, Na, K, Ca, Mg). Die erhaltenen Produkte, die Natriumsilicathydrate Ilerit, Magadiit und Kenyait und ein Kaliumsilicathydrat sind…
The electron-spin-resonance (ESR) linewidth and line shape for the quasi-two-dimensional organic metals \ensuremath{\beta}-(BEDT-TTF${)}_{2}$X [BEDT-TTF is bis(ethylenedithiolo)tetrathiafulvalene, ${\mathrm{C}}_{10}$${\mathrm{H}}_{8}$${\mathrm{S}}_{8}$, and X is ${\mathrm{I}}_{3}$ or ${\mathrm{IBr}}_{2}$] are examined…
Abstract The particle morphology and percent grafting were investigated as a function of the crosslink density of the seed latex in two systems of core/shell latexes of polybutadiene/polymethyl methacrylate (PB/PMMA) and styrene–butadiene rubber/polymethyl methacrylate (SBR/PMMA) prepared by seeded emulsion polymeriza…
Abstract Four different polyimides have been studied by thermogravimetry to ascertain their relative thermal stabilities in both inert and oxidising atmospheres. Experiments have been carried out at a rate of temperature rise of 2°C min −1 and isothermally at a number of temperatures in order to calculate overall acti…
Abstract In summary, the solid state C-13 NMR technique has proven to be a significant method for the detection of crosslinks and other structural modifications in accelerated sulfur-vulcanized NR systems. When the amount of accelerator is high in proportion to the amount of sulfur used, the network structure appears…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal conformation of polysaccharides in solution investigated by small-angle x-ray scatteringYoshio Muroga, Yasunori Yamada, Ichiro Noda, and Mitsuru NagasawaCite this: Macromolecules 1987, 20, 12, 3003–3006Publication Date (Print):May 1, 1987Publication History Published o…