Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHairpin configurations of triblock copolymers at homopolymer interfacesT. P. Russell, A. M. Mayes, V. R. Deline, and T. C. ChungCite this: Macromolecules 1992, 25, 21, 5783–5789Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published in…
We demonstrate cw optical bistability at 1.06 μm using the large thermo-optical nonlinearity from the metal-semiconductor phase transition in a thin-film interference filter of vanadium dioxide. Highly stable and reproducible operation has been obtained. By biasing at the transition point, an all-optical external swit…
Abstract Photon correlation spectra of polarized scattered light from poly( n ‐hexylmethacrylate) PHMA (M w = 1.6·10 5 , T g = −5°C) have been studied in the temperature range of −2–25°C. The experimental time correlation functions over the time range 10 −6 −10 2 s were represented by the Kohlrausch‐Williams‐Watts (KW…
A small amount of graphite dust is present in the primary cooling system of a graphite, moderated gas-cooled reactor during normal operation and condensable fission products may be absorbed on the dust. Since it is possible that the fission products are released with dust under the accident conditions such as depressu…
The coefficient of thermal expansion (CTE) of a 140‐μm‐diameter SiC monofilament was determined to be 6.5 ± 0.5 × 10 −60 C −1 in the temperature range 25°–900°C. Heat treatment of the fibers at 1400°C for 90 min resulted in both an increase in the intensities of the SiC peaks and a reduction of their width, indicating…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFramework alkali metal zinc orthoborates: AZn4(BO3)3 (A = K, Rb, Cs)Robert W. Smith, Jeanne L. Luce, and Douglas A. KeszlerCite this: Inorg. Chem. 1992, 31, 22, 4679–4682Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of "scale" mineral solubilities. 4. Experimental measurements of strontium sulfate(s) in water and aqueous sodium chloride from 25 to 250 .degree.C and from 1 to 500 barRobert D. Howell, Krishnam Raju, and Gordon AtkinsonCite this: J. Chem. Eng. Data 1992, 37,…
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…