Materials Literature
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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…
The crystallography and atomic structure of inversion twin boundaries were studied in polycrystalline ZnO using conventional transmission electron microscopy and high‐resolution electron microscopy. Inversion twin boundaries. In order to determine the atomic structure of the inversion twin boundary, high‐resolution tr…
The measurement of the longitudinal speed of sound in crystals of ribonuclease-A and in human haemoglobin using laser-generated ultrasound is reported. Average values of 1784 (72) m s-1 and 1828 m s-1 were obtained. As a control the speed of sound transmitted through a compacted disc of lysozyme powder was measured as…
FIT is an interactive computer program for fitting analytical models to powder diffraction patterns and to pair correlation functions. FIT has been written in Turbo C and runs on IBM XT/AT or compatible personal computers.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of hydroxide ion with manganese(III) tetramesitylporphyrin and the oxidation states of manganese tetramesitylporphyrinsRamesh D. Arasasingham and Thomas C. BruiceCite this: Inorg. Chem. 1990, 29, 7, 1422–1427Publication Date (Print):April 1, 1990Publication History…
The approach described by Bricogne & Gilmore [Acta Cryst. (1990). A46, 284-297] (I) is applied to three small organic molecules. Phase extension for sucrose octaacetate (C28H38O19) from a basis set of 300 correctly phased U magnitudes confirms the stability of the exponential modelling and plane-search algorithms unde…
The later-stage spinodal decomposition (SD) of polymer mixtures at deep quenches were investigated by time-resolved light scattering. The scaled structure factor F(x)≡qm (t,T)3I(x) with x≡q/qm (t,T) was analyzed as a function of time t or reduced time τ during the SD at various temperatures T’s, where qm (t,T) is the…
The feasibility of making multilayer optical filters using polymerized solgel solutions was demonstrated. Theoretical modeling was done to determine the expected optical response of multilayer coatings with various index profiles to select a coating design which was achievable using current technology and which would…