Materials Literature
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A number of 2-fluorenyl 4′-alkylbenzoates and 4′-alkoxybenzoates have been synthesized to study the effects of the central ester linkage on their mesomorphic behavior. These compounds typically show nematic (N) and the uniaxial smectic phases. Many isomeric fluorene esters with reversed ester linkage were also prepare…
The author' work on preparing polyethers with reactive side chains is reviewed with emphasis on hydroxy polyethers. High molecular weight hydroxy polyethers were prepared by polymerizing epoxides containing a hydroxyl group protected with an appropriate group such as SiMe3 and then removing it by hydrolysis. Atactic a…
Abstract Dipiperidinosquaraine ( 9 ) crystallizes in the orthorhombic system, space group Pnab , with four molecules in a cell of dimensions a = 7.1798(9), b = 9.5362(8), and c = 18.788(2) Å. The molecule is located over a center of symmetry, so the four‐membered ring (C – C = 1.456(1) Å av) is exactly planar; the nit…
The simplified Conti and Tassinari model describing the kinetic mechanism of pilling was adopted for knitted wool fabrics, and the theory extended to compare the relative masses of pill able and nonpillable fiber being removed during the attrition process. Wool treated with potassium permanganate in saturated sodium s…
Thiol-containing antioxidants such as 4-(mercaptoacetamido)-diphenylamine (MADA) undergo ready addition of-SH groups to the double bonds in diene rubbers in the presence of initiators. The reaction is a radical chain process leading to rubbers with improved thermooxidative resistance. The modification reaction has bee…
Abstract A survey of transition phenomenology in amorphous entangled polymers is presented. Using a general scaling hypothesis characteristic lengths are systematically attached to the different zones of the multiple glass transition. New experimental results show the location of caloric spectra between the peaks of G…
Abstract In spite of the remarkable advances that have been made in the engineering design of tires during the past two decades, the basic formulations used in vulcanization and protection during service have essentially remained unchanged. This is to a large extent due to two major factors: 1. The versatility of the…
Serious production and quality problems occur from time to time in cotton processing as a result of fiber stickiness, which is related to an increase in the level of monosaccharides on cotton fibers, mainly fructose and glucose. Microbiological activity may alter this sugar level, both qualitatively and quantitatively…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlavonoid-O-Glycosides from the Herbs of Leonurus cardiacaTheodor Kartnig, Adelheid Gruber, and Susanne MenzingerCite this: J. Nat. Prod. 1985, 48, 3, 494Publication Date (Print):May 1, 1985Publication History Published online1 July 2004Published inissue 1 May 1985https://do…
A15 Nb 3 (Ge, Si) films with compositionally modulated superstructure have been synthesized by sputtering from rotated targets. Some of the films exhibit a remarkable maximum of resistivity in the vicinity of the onset temperature of superconductive transition between 7 K and 19 K on the abscissa, when the dc current…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAxial interaction of vanadyltetraphenylporhyrin with Lewis basesC. Susana Bencosme, Carlos Romero, and Santiago SimoniCite this: Inorg. Chem. 1985, 24, 10, 1603–1604Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue 1 May 1985…
Abstract Four divalent Mn phosphate compounds were prepared and identified. The compound, Mn 3 (PO 4 ) 2 ·3H 2 O slowly transformed to Mn 5 H 2 (PO 4 ) 4 ·4H 2 O, when the solid was left in contact with the mother liquor. Dissociation constants were determined for the following reactions: urn:x-wiley:03615995:saj2sssa…
Abstract Für schlagzähe Polystyrene und ABS‐Polymere werden die in der Literatur vorhandenen Modelle zur Erklärung der verbesserten Zähigkeit kritisch betrachtet. Auf der Grundlage der Ergebnisse einer direkten Untersuchung der Mikroprozesse von Deformation und Bruch an dünnen Dehnproben in einem Höchstspannungs‐Elekt…
Abstract not Available.
Vulcanization of silicon rubber compound based on polysiloxanes containing vinyl and Si–H groups catalyzed by [RhCl(CO)2]2, [RhCl(C2H4)2]2, [RhCl(1,5-COD)]2, [RhCl(NBD)]2, RhCl[P(C6H5)3]3, and Rh(acac)3 (1,5-COD = 1,5-cyklooktadiene, NBD = norbornadiene, acac = acetylacetonate) has been studied in dependence on the ca…
Emission and excitation spectra of the phosphor CsI: Tl+ have been measured between 4·2 K and room temperature. Quenched crystals of CsI: Tl+, when excited in any of the five absorption bands that lie between 290 and 238 nm, exhibit two overlapping luminescence bands that lie at 2·19 eV (560 nm) and 2·53 eV (490 nm) a…
Abstract The effects of added co‐catalysts on the clay catalyzed polymerization of oleic acid have been investigated. Heating oleic acid at 230 C for 3 hr with a clay catalyst gave a polymer fraction (dimer and trimer acids, 35% yield) and a monomer fraction (branched chain isomers of oleic acid, 27% yield) as the maj…
The mechanical properties, tensile strength, and elongation were investigated for poly(vinyl chloride) (PVC) samples mixed with dioctylphthalate (DOP) at concentrations from 0 to 100 parts per hundred parts PVC at 23°C. It was found that the tensile strength decreased with the increase of concentration, and the elonga…
Scanning and transmission electron microscopy and the C-Pt replica technique have been used to investigate grain boundary structures in sintered polycrystalline A12O3 with varying concentrations of MgO dopant. A method is proposed for evaluating the fracture toughness, Kβb c, and the strength of grain boundaries from…
A retarding field energy analyser for quantitative voltage measurements which functionally connects a uniform extracting field with a hemispherical analysing field is described. The design principles are : (i) the centres of the hemispherical grids are to be put on the virtual source from which the secondary electron…