Materials Literature
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Photoelectron spectra of the bicyclo[1.1.1]pentanes 1 and 2 reveal a high degree of splitting (0.7 eV) between the π-MOs of the ethynyl residues and the 4p orbitals of the bromine atoms, respectively. This is presumably due to strong interaction between the π systems and the σ system of the bicyclopentane framework. A…
Stress corrosion cracking (SCC) of type 304 (UNS(1) S30400) and type 316 (UNS S31600) austenitic stainless steels in acidic chloride and sulfate solutions has been investigated as functions of pH and concentration by using the constant load method. It is found under a constant stress condition of 437 MPa that the loga…
The advantages of multilayer coated blazed gratings are discussed, and multilayer/grating matching conditions are considered. Measurements of a W/C multilayer-coated, 2000 g/mm 3.8° blaze angle ion-etched grating and superpolished flat are reported. These include reflectometer measurements as well as operational perfo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of alkali and alkaline-earth metals on the resistivity to coke formation and sintering of nickel-alumina catalystsIenwhei Chen and Fan Lun ChenCite this: Ind. Eng. Chem. Res. 1990, 29, 4, 534–539Publication Date (Print):April 1, 1990Publication History Published onlin…
It has been shown previously that linear polyethylenes undergo increases in crystallinity and peak melting temperature after irradiation, the magnitude of the effects being dependent upon the dose and the molecular weight of the polymer. The crystallinity was also found to increase with time after irradiation (aging)…
Diamond thin film technology I. In the first article of a regular series Peter Bachmann of the Philips Research Labs in Aachen, FRG, describes the different methods used to deposit diamond in films (see figure). Diamond in this form has many applications e.g. as an abrasive material, in lithography masks, microwave wi…
Abstract Isothermal aging after a quench from above the glass‐transition temperature ( T g ) to below it was studied as a function of cross‐link density for model epoxy networks using small deformation stress relaxation experiments. We found that time‐aging time and time‐cross‐link density superposition principles des…
The adsorption-desorption behaviour of four pesticides, in four Western Australian soils differing in their physico-chemical properties, has been studied using a batch technique. Sorption data for Fenamiphos, Linuron and Simazine could be fitted to a Freundlich-type equation, while that for Diquat more closely fitted…
Abstract Quantitative thermal analysis of a family of semicrystalline polyimides containing from one to three ethylene glycol spacer units has been conducted. Special emphasis has been placed upon the changes in the thermodynamic properties resulting from the successive additions of ethylene glycol units. The solid an…
Abstract We discuss two new two-dimensional nuclear quadrupole resonance experiments, both based on the principle of nutation spectroscopy, which can be used to determine the asymmetry parameter, and thus the full quadrupolar tensor, of spin-3/2 nuclei at zero applied magnetic field. The first experiment is a simple n…
This paper presents the production of the a reverse-mode microdroplet liquid crystal (RMLC) light shutter display. In this unit, the display is formed by a thin polymer film with dispersed liquid crystal microdroplets. The display is light transmissive in the absence of an applied electrical field. The display is conv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFunctionalization of polyolefins: determination of the structure of functional groups attached to polyethylene by free radical reactionsMauro Aglietto, Roberto Bertani, Giacomo Ruggeri, and Anna Laura SegreCite this: Macromolecules 1990, 23, 7, 1928–1933Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDensities and viscosities of binary liquid mixtures of anisole with methanol and benzeneShrikant S. Joshi, Tejraj M. Aminabhavi, and Shyam S. ShuklaCite this: J. Chem. Eng. Data 1990, 35, 2, 187–189Publication Date (Print):April 1, 1990Publication History Published online1 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman scattering from model acrylic adhesive systemsF. J. Boerio, P. P. Hong, P. J. Clark, and Y. OkamotoCite this: Langmuir 1990, 6, 4, 721–727Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990…
Ferroelectric polymers are reviewed with special interest in the polarization reversal and phase transition behavior of VDF copolymers. The ferroelectric phase consists of all-trans molecules packed in a parallel manner. Its spontaneous polarization is reversed at very high fields by eventual 180° rotations of individ…
The apoenzyme of wild-type (WT) dihydrofolate reductase (DHRF) from Escherichia coli exists in two conformational states, Et and Ew, which differ in affinity for NADPH and in kinetic competence. Dissociation constants for the binary complex of NADPH with the two conformers differ by over 100-fold (KDt = 0.17 microM, K…
A wide aperture liquid crystal polarized light source (LC-PLS) is presented which converts unpolarized-into circular- and/or linearly polarized light with an efficiency better than 80%. Moreover, new operating modes for electro-optical field-effects on which liquid crystal displays (LCDs) are based are shown to increa…
A different approach to study the viscosity of concentrated suspensions is proposed. It is based on percolation theory. It is suggested that at the critical concentration of fillers, ${\mathrm{\ensuremath{\varphi}}}_{\mathit{c}}$ a macroscopic interconnected cluster (secondary structure) of fillers is formed. This clu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polymers containing heterocycloalkanediyl groups as mesogens. 8. Morphological evidence for microphase separation in poly(methylsiloxane-co-dimethylsiloxane)s containing 2-[4-(2(S)-methyl-1-butoxy)phenyl]-5-(11-undecanyl)-1,3,2-dioxaborinane side groupsV.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe fractal nature of 1-step highly-branched rigid rodlike macromolecules and their gelled-network progeniesS. M. Aharoni, N. S. Murthy, K. Zero, and S. F. EdwardsCite this: Macromolecules 1990, 23, 9, 2533–2549Publication Date (Print):April 1, 1990Publication History Publis…