Materials Literature
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Abstract Prolonged heating at temperatures below 140°C. causes only slight changes in the properties of polysulfone. Exposure to ultraviolet light, however, results in substantial changes as evidenced by broad absorption in both the hydroxyl and carbonyl regions of the infrared spectrum, evolution of carbon monoxide a…
The form and crystal structure of the fibers attached to the diatom Thalassiosira fluviatilis were studied by the electron microscope and x-ray diffraction.These fibers, which were shown previously to be pure, highly crystalline β-(1 → 4) linked poly-N-acetyl-D-glucosamine (chitan), are strap-like in cross section, 10…
"Radiation Heat Transfer." Nuclear Science and Engineering, 32(2), pp. 280–281
Abstract An effective surface treatment for adhesive bonding of polyethylene has been developed. It involves exposing the polymer to an environment of elemental fluorine or fluorine diluted in argon. By this treatment, extensive fluorination of the surface region is effected. The fluorinated surface permits formation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Mixing Polymethylene and PolyisobutyleneP. J. Flory, B. E. Eichinger, and R. A. OrwollCite this: Macromolecules 1968, 1, 3, 287–288Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs…
Effects of light intensity and current velocity on the species composition and ecological properties of communities of benthic algae were investigated in laboratory streams. Of the 15 diatom taxa studied, only Melosira varians, Meridion circulare, and Navicula radiosa were more abundant in streams receiving 700 ft—c o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOctaethylporphyrinH. W. Whitlock Jr. and R. HanauerCite this: J. Org. Chem. 1968, 33, 5, 2169–2171Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs.org/doi/10.1021/jo01269a122https://doi.org/10.1021…
Abstract As an extension of earlier work on the crystallization kinetics of isotactic polystyrene, the spherulite growth rate in mixtures of isotactic polystyrene and benzophenone has been measured over a concentration range extending from pure polymer to a mixture containing about 30% benzophenone. The glass transiti…
J. B. CHAPPELL, B.A. Ph.D.; SYSTEMS USED FOR THE TRANSPORT OF SUBSTRATES INTO MITOCHONDRIA, British Medical Bulletin, Volume 24, Issue 2, 1 May 1968, Pages 150–
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT p,p'-Biphenol-Dianilinosilane Condensation CopolymersW. R. Dunnavant, R. A. Markle, R. G. Sinclair, P. B. Stickney, J. E. Curry, and J. D. ByrdCite this: Macromolecules 1968, 1, 3, 249–254Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Publ…
Solid cylindrical specimens (½- × ½-in.) of the monocarbides of Ti, Zr, Ta, Nb, and W, made by 1) hot pressing, 2) slip casting and sintering, and 3) explosion-pressing and sintering, were irradiated at 300 to 700°C. Fast-neutron (> 1 MeV) exposures ranged from 0.8 to 5.4 × 1021 n/cm2 in a fast-neutron flux profile wh…
In the usual contact plants 97-98% of the SO2 is oxidized to SO3 while the remaining 2-3% nonoxidized S02 are emitted. The stack gas generally contains 0.2-0.3% by volume SO2.Through changing to the Bayer Double Contact process, the conversion can be raised to 99.5% or higher. The sulfuric acid can be produced at the…
Abstract A series of well‐characterized polyamic acids from pyromellitic dianhydride and 4,4′‐diaminodiphenyl ether of systematically varied molecular weight and known molecular weight distribution were chemically converted to polyimide films under regulated conditions. The films were essentially noncrystalline, of mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-spin, five-coordinate cobalt(II) complexesZvi Dori and Harry B. GrayCite this: Inorg. Chem. 1968, 7, 5, 889–892Publication Date (Print):May 1, 1968Publication History Published online1 May 2002Published inissue 1 May 1968https://pubs.acs.org/doi/10.1021/ic50063a010https…
ABSTRACT The validity of boron in illite as a salinity indicator has been questioned recently. Using analytical data from whole rocks, some workers argue that illite is predominantly detrital and inherits much of its boron from the parent rocks. They also believe that additional boron, absorbed at the time of depositi…
Abstract Two crystalline forms (α and β) of poly(vinylidene fluoride) were studied by infrared spectroscopy. The spectral differences permitted the study of the transformation and the ratio of the two forms. The ordinary \documentclass{article}\pagestyle{empty}\begin{document}$ \vec G,\vec F $\end{document} matrix met…
Based upon a thermodynamic study of the accelerated oxidation of superalloys exposed in oxidizing environments containing minor quantities of sea salt, it is concluded that (a) NaCl is necessary only to form Na2SO4, (b) Na2SO4 is formed by the reaction between NaCl and the oxides of sulfur, (SO2 and SO3) and (c) accel…
The complex dielectric constant of NaNO 2 crystal was measured in a frequency range between 1 MHz and 24 GHz from room temperature to 210°C. The measuring methods in the various frequency ranges were described in detail and especially the measuring accuracies in the complex dielectric constant and the temperature were…
A simple, rapid‐quenching device was used to investigate the extent of liquid‐liquid immiscibility in the system BaO‐SiO 2 . A metastable miscibility gap was found with an upper consolute point at about 10 mole % BaO and 146OOC. Bulk glass samples of different compositions and heat treatments were examined by direct‐t…
Abstract It has been known that cyclohexanol has low-temperature form (crystal-II) and high-temperature form (crystal-I) and that the supercooled crystal-I shows in its heat capacity curve an anomalous jump resembled to that associated with glass transition. In order to clarify whether this anomaly arises from relaxat…