Materials Literature
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A density-functional description of liquid crystals is developed. Formally exact expansions for thermodynamic functions in terms of a direct-correlation function are given. Approximations to the direct-correlation function lead to different versions of the molecular-field theories of liquid crystals. The properties of…
A series of reactive, end-capped, polyimide oligomers has been prepared for possible use as planarizing coatings in the electronics industry. Thus, 1,3-bis(3-aminophenoxy)benzene was treated with various excess amounts of 2,2-bis(3,4-dicarboxyphenyl)hexafluoro-propane dianhydride in m-cresol containing toluene and iso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of aggregates on extinction and surface-enhanced Raman scattering spectra of colloidal silverM. Kerker, O. Siiman, and D. S. WangCite this: J. Phys. Chem. 1984, 88, 15, 3168–3170Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Publish…
Abstract The deformation behavior of three polymers, polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), and linear polyethylene (LPE) is considered in terms of two key factors, the stretching of a molecular network and the influence of thermally activated processes. In PET the observation of a natural dr…
Abstract The balance of impact strength and rigidity of polypropylene can be significantly improved by physical blending of the polypropylene with a talc filler and a variety of elastomer types. Unsaturated elastomers were found to be effective impact strength improvers in 70/15/15 percent PP/elastomer/talc composites…
Abstract A Vilsmeier adduct derived from arylsulfonyl chlorides and DMF in pyridine was successfully used as a new condensating agent for the synthesis of aromatic polyesters by the direct polycondensation of aromatic dicarboxylic acids and bisphenols and also of hydroxybenzoic acids. Polymers of high molecular weight…
Triple lines in polycrystalline aggregates are lines where three grains meet. It is shown that these lines can be interpreted as disclinations if the relations between adjoining grain orientations are chosen as nearest-neighbour relations. These relations are needed for describing quantitatively the structure of the i…
Applicatims a Mo- and W-based heteropoly acids (HPA) as a catalyst in the oxidation of olefins have extensively been investigated1. However, a patent work is only attempted concerning the evoxidatim of olefins with H202 by HPA2) since the oxirane ring is cleaved because of a strong acidity of HPA itself. Herein, an ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility enhancement via ion-dipole interactions. 1. Polystyrene ionomer/poly(alkylene oxide) systemsM. Hara and A. EisenbergCite this: Macromolecules 1984, 17, 7, 1335–1340Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissu…
Abstract The synthesis and phase behaviour of azo dye containing liquid crystalline side group copolymers are described. These Copolymers show the same electro‐optical effects as low molar mass guest‐host systems. Their macroscopic oriented nematic structure can be frozen in below the glass transition temperature resu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution carbon-13 NMR study of silk fibroin in the solid state by the cross-polarization-magic angle spinning method. Conformational characterization of silk I and silk II type forms of Bombyx mori fibroin by the conformation-dependent carbon-13 chemical shiftsHazime…
Insulin adsorption isotherms on various materials have been measured to begin to clarify the role of material surface energy in insulin aggregation. Using 125I-insulin and direct gamma-counting of the exposed material, more insulin (per unit area) was adsorbed to hydrophobic materials (Teflon, Silastic) than to the hy…
High‐purity magnesium oxide powder was prepared by eon‐trolled decomposition of magnesium chloride hexahydrate. The MgO was hot‐pressed between 1720 and 2170 K and at pressures from 4.4 to 31 MPa. At 1873 K, the densification rates measured at fixed values of density were proportional to the power n = 3 of the applied…
The orbital magnetic susceptibility of two coupled graphite layers is calculated as a function of temperature and Fermi energy ($\ensuremath{\mu}$). The susceptibility is shown to be diamagnetic at small values of $\ensuremath{\mu}$, and paramagnetic at large values of $\ensuremath{\mu}$, with a paramagnetic peak at $…
This paper describes the work conducted at the British Gas Engineering Research Station (ERS) using laboratory tests of the BP and NACE type to assess the hydrogen induced cracking (HIC) resistance of pipeline steels. Various grades of linepipe and fittings steels have been studied, and the metallurgical parameters co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane waste recycling. 1. Glycolysis and hydroglycolysis of water-blown foamsJohn Gerlock, Jacob Braslaw, and Mikio ZinboCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 3, 545–552Publication Date (Print):July 1, 1984Publication History Published online1 May 200…
Die faszinierende Gruppe der Centropolyquinane ist durch Cyclopentanringe mit einem gemeinsamen, zentralen C-Atom gekennzeichnet. Die Titelverbindungen 1 und 2 sind überraschend einfach aus 2,2-disubstituierten 1,3-Indandiolen erhältlich.
Since free radical ring-opening polymerization made it possible to introduce functional groups, such as esters, carbonates, thioesters, and amides, into the backbone of an addition polymer, it was reasoned that simple hydrolysis of these copolymers would produce the desired oligomers that could be terminated with vari…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-state relaxation dynamics in iron(III) complexes: photochemical perturbation of the 2T .dblharw. 6A spin equilibrium by pulsed-laser irradiation in the ligand-to-metal charge-transfer absorption bandIan Lawthers and John J. McGarveyCite this: J. Am. Chem. Soc. 1984, 106…
The precipitation behavior of the nickel-base alloys Ni-Cr-22 Fe-18 Mo (Hastelloy-X) and Ni-Cr-22 Co-12 Mo (Inconel-617) has been investigated as a function of aging temperature. Hastelloy-X shows that M6C and TiN are primary precipitates and M12C, A3B2 (≈ Fe3Mo2), and M23C6 are secondary precipitates, while Inconel-6…