Materials Literature
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The effect of fluorine substitution into a mesogenic system depends critically on the manner in which it is introduced. The relative stabilities of smectic and nematic phases may be inverted by altering the site of substitution, and lateral fluorination is particularly interesting for the strong suppression of smectic…
Cellulose samples from cotton and wood pulps with varying low degrees of crystallinity (mechanically decrystallized) were studied. The influence of initial cellulose crystallinity on sugar yield after enzymatic hydrolysis was determined by two different methods. As expected, samples with low crystallinity were much mo…
Comparison between the deformation structures of aluminium appearing as striations on the surface of specimens and the dislocation structures is not straightforward. The influence of grain boundaries on deformation structures in particular is difficult to interpret, and the effects seen at boundaries have not been ful…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of telechelic living poly(vinyl ethers)Masaaki Miyamoto, Mitsuo Sawamoto, and Toshinobu HigashimuraCite this: Macromolecules 1985, 18, 2, 123–127Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue 1 February 1985…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectrochemical properties of bis(2,2'-bipyridine)(4,4'-dicarboxy-2,2'-bipyridine)ruthenium(II) chlorideTakeo Shimidzu, Tomokazu Iyoda, and Kansei IzakiCite this: J. Phys. Chem. 1985, 89, 4, 642–645Publication Date (Print):February 1, 1985Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent metal ion catalysis in the hydrolysis of esters of picolinic acid. Metal ion promoted hydroxide ion and water catalyzed reactionsThomas H. Fife and Theodore J. PrzystasCite this: J. Am. Chem. Soc. 1985, 107, 4, 1041–1047Publication Date (Print):February 1, 1985Publi…
The water content of 12 paints on steel substrate, exposed to 0.1 M sodium chloride at 25 C for 24 h, was calculated from impedance measurements and compared with gravimetric determinations. Brasher’s empirical expression was compared with five mixture formulas derived from the theory of dielectric properties of heter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of blocked and ligand-appended hemes derived from atropisomeric meso-diphenylporphyrinsRichard Young and Chris K. ChangCite this: J. Am. Chem. Soc. 1985, 107, 4, 898–909Publication Date (Print):February 1, 1985Publication History Published onli…
The electrical conductivity of solvent and electrolyte-wetted poly(pyrrole) films is measured, both statically and dynamically, as a function of the potential applied to an electrode in contact with the film. The applied potential determines the film oxidation state. Poly(pyrrole) electrical conductivity is ohmic and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of borate complexation in assigning relative stereochemistry of acyclic polyhydroxylated compoundsRichard E. Moore, Joseph J. Barchi Jr., and Giovanni BartolinCite this: J. Org. Chem. 1985, 50, 3, 374–379Publication Date (Print):February 1, 1985Publication History Publis…
The components of the elastic constant matrix of monoclinic caesium dihydrogen phosphate (CDP) have been determined using ultrasonic velocity measurements to be Cl1 = 28· 83 ± 0 '43, C22 = 26·67 ± O· 37, C33 = 65 ·45 ± 0'48, C44 = 8 .1O± 0,15, Css = 5 ·20± 0,24, C66 = 9·17 ± 0,22, C12 = 1l'4±3'6, C13 = 42·87±1·58, CIS…
Abstract From hydrothermal experiments three pressure-temperature-time curves have been refined for the system Al 2 O 3 −SiO 2 −H 2 O and reversal temperatures established for two of the principal reactions involving kaolinite. The temperatures of three isobaric invariant points enable the Gibbs free energy of formati…
In thermal relaxation calorimetry, the heat capacity can be calculated from the time constant τ1=Cp/Kb of the exponential decay of the cooling curve. If the thermal bond between the sample and sample holder is poor, the cooling curve is described by T−T0=A1 exp(−t/τ1)+A2 exp(−t/τ2). Analysis shows that the heat capaci…
High pressure DTA experiments show that the dehydroxylation of kaolinite in dry runs with P(Total) : P(argon) proceeds at 525c and I bar to 627c at 30.5 bars. Further increase in pressure slowly increases the dehydroxylation temperature, at 5270 bars it occurs at 670'C. Under conditions of P(Total) : p1rOr, dehydroxyl…
Abstract Die Halogenide sind entweder mit K 2 PrCl 5 (orthorhombisch, Pnma, Z = 4, hexagonal gebündelte Ketten kantenverknüpfter Polyeder [PrCl 7 ]) order mit Cs 2 DyCl 5 (orthorhombisch, Pbnm, Z = 4, hexagonal gebündelte Ketten cis‐eckenverknüpfter Oktaeder [DyCl 6 ]) isotyp, sie können in Strukturfeld‐Diagrammen von…
Abstract The crystal structure of Sb 2 Se 3 has been redetermined with 610 independent reflections, using three-dimensional intensities measured on a computer-controlled Philips PW 1100 single-crystal diffractometer. The structure does not deviate in principle from that proposed by Dönges (1950) and Tideswell, Kruse,…
Results of combined electrical and thermal stress aging studies conducted on scaled-down models of rotating machine insulation are presented. In order to save time and cost, accelerated stress testing procedure with type II censoring is adopted. The service life of insulation is estimated by extrapolation. The model f…
The temperature dependence of bending strength, fracture toughness, and Young's modulus of composite materials fabricated in the ZrO 2 (Y 2 O 3 )‐Al 2 O 3 system were examined. The addition of A1203 enhanced the high‐temperature strength. Isostatically hot‐pressed, 60 wt% ZrO 2 (2 mol% Y 2 O 3 )/40 wt% Al 2 O 3 exhibi…
Temperature dependences of density, refractive indices, and dielectric constants have been measured for mesogenic compounds of as for some of their cyano-analogues: and . The effects of substituting a phenyl ring by a cyclohexyl ring, as well as of a –CN group by an –NCS group have been analyzed. The results lead to t…
Abstract The three-dimensional order shown by the two-layer hydrates of Na- and Ca-vermiculite, prepared from Mg-vermiculite from Llano, Texas, has enabled clear, two-dimensional Fourier projections of their interlayer structures to be obtained. Structure factor calculations were made in space group C 2 and with unit-…