Materials Literature
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Abstract Some itaconic acid derivatives were prepared and polymerized, in which itaconic acid (IA), β ‐monoalkyl itaconates (mRI), dialkyl itaconates (DRI), N ‐substituted itaconamates (IAE), itaconamides (IAm), itaconic anhydride (IAn), N ‐alkylitaconimides (RII), and N ‐(alkyl‐substituted phenyl)itaconimides (RPhII)…
Stoichiometric albite glass (NaAlSi 3 O 8 ) was seeded with 5 wt% crystalline anorthite (CaAl 2 Si 2 O 8 ) to make albite glass‐ceramics. The epitaxial crystallization of the albite glass to the glass‐ceramics was investigated by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectr…
Abstract Gas permeability and permselectivity are investigated for polybenzoxazoles from bis (3‐amino‐4‐hydroxyphenyl)‐1,1,1,3,3,3‐hexafluoropropane (BAHHP) and aromatic diacid chlorides. Effects of thermal cyclization on the permeation properties are also investigated. The polybenzoxazole from BAHHP and 4,4′‐(1,1,1,3…
Abstract An active ingredient of peptic ulcer healing agent “Colloidal Bismuth Subcitrate (CBS)” has been isolated by crystallization from a solution containing bismuth citrate and ammonia. The single-crystal X-ray structure analysis has demonstrated that it consists of unique anionic hexanuclear bismuth oxo-hydroxo-c…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular weight and molecular weight distribution effects on the liquid-crystalline and biphasic behavior of a thermotropic polyesterMichele Laus, A. Sante Angeloni, Giancarlo Galli, and Emo ChielliniCite this: Macromolecules 1992, 25, 22, 5901–5906Publication Date (Print):…
J. P. Kociolek, D. B. Herbst, Taxonomy and Distribution of Benthic Diatoms from Mono Lake, California, U.S.A., Transactions of the American Microscopical Society, Vol. 111, No. 4 (Oct., 1992), pp. 338-355
The ultraviolet circular dichroism of a protein can be used to estimate the net fraction of its amino acids in different classes of secondary structure. Recent advances in the accuracy of such calculations have resulted from improved computational techniques, as well as extension of the spectral region analyzed to wav…
Polymer dispersed liquid crystal (PDLC) films with memory electrooptical characteristics were fabricated. The approach made use of phase transition characteristics of smectic liquid crystals. If a smectic is cooled from the nematic to the smectic state in the presence of an electric field, one obtains an aligned smect…
A series of amino- and hydroxytetraphenylporphyrin derivatives was found to have activity against the human immunodeficiency virus type 1 (HIV-1) in human peripheral blood mononuclear cells. Activity tends to be associated with increased hydrophilicity of the porphyrins for the porphyrins with one substituent on each…
Abstract Polyacrylonitrile (PAN) is soluble at room temperature in some ionic aqueous media and in many polar organic liquids such as dimethyl sulfoxide, but the polymer will not crystallize from these solvents. It is known, however, that PAN will from single crystals from dilute propylene carbonate (PC) solutions. It…
Thermotropic polymers containing charge‐bearing mesogenic moieties in the repeat unit are rare. This article reports a self‐assembly, two‐component approach for the preparation of side‐chain liquid‐crystalline polymeric materials possessing charged hydrogen‐bonded mesogenic groups. A unique feature of this system is t…
Regulations are continually being passed that limit the volatile organic content (VOC) of elastomer coating systems. Because of this restriction, high solids, two-component spray elastomers and coatings are attaining in creases in market interest and sales volume. As this interest grows, the research and development e…
Crystals of the 1:3 complex between antimony triiodide and sulfur, SbI3 * 3S8, are found to possess a high second-order optical nonlinearity. The powder second-harmonic generation efficiency is found to be approximately half of that of the isostructural complex of iodoform with sulfur, CHI3 * 3S8. Second-harmonic gene…
Abstract Differential scanning calorimetry (DSC) was used to study the effects of melt history on the isothermal crystallization kinetics of poly(phenylene sulfide) (PPS). Crystallization of the polymer was shown to be permanently altered by both the time and the temperature spent in the melt. Suggested explanations a…
We discuss simulations using a recently derived Monte Carlo method which generates the isoenthalpic-isotension-isobaric ensemble or HtN ensemble of classical statistical physics. This method is the Monte Carlo counterpart of the Andersen-Parrinello-Rahman HtN form of molecular dynamics. As an example of the use of HtN…
Abstract Authigenic chlorites and illites coexisting in clastic reservoir sandstones have been studied by energy dispersive X-ray spectroscopy (EDS) in the transmission electron microscope (TEM). All 16 samples studied are drill or sidewall cores from sandstones of relatively uniform age situated offshore Norway with…
Recently, we amplified the Lactobacillus bulgaricus NAD(+)-dependent D-lactate dehydrogenase gene by the polymerase chain reaction, cloned and overexpressed it in Escherichia coli (Kochhar, S., Chuard, N., and Hottinger, H. (1992) Biochem. Biophys. Res. Commun. 185, 705-712). Polymerase chain reaction-amplified DNA fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the porphyrin macrocycle on the spectroscopic properties and catalytic activity of electroreduced nickel(II) porphyrinsK. M. Kadish, M. M. Franzen, B. C. Han, C. Araullo-McAdams, and D. SazouCite this: Inorg. Chem. 1992, 31, 21, 4399–4403Publication Date (Print):Oc…
We investigated ${\mathrm{Pr}}_{2}$${\mathrm{BaO}}_{4}$ and ${\mathrm{PrBaO}}_{3}$ by several complementary experimental techniques. ${\mathrm{PrBaO}}_{3}$ crystallize in an orthorhombic structure. dc and ac susceptibility measurements exhibit irreversibility phenomena below ${\mathit{T}}_{\mathit{N}}$=11.7 K and reve…