Materials Literature
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The dynamic mechanical properties of thermoplastic urethane elastomers have been charac-terized for polymers composed of varying hard-segment concentrations and for two different molecular weight polyester diols as soft segments. The urethane polymers based on an 830 M̄n polycaprolactone diol exhibited a progressive i…
We give a chart mostly useful for heating and cooling Mn-Zn-ferrites with a constant oxidation degree. This chart has five different scales : a logarithmic one for PO2(arm), temperature (I/T), scales for Fe2O3and MnO contents (mole %) and another one for the oxidation degree. In the composition range given, with fixed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of Polydimethylsiloxane and Its Block Copolymers with StyreneJ. G. Zilliox, J. E. L. Roovers, and S. BywaterCite this: Macromolecules 1975, 8, 5, 573–578Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible adsorption of oxygen on silica gel modified by imidazole-attached iron tetraphenylporphyrinOrlando Leal, David L. Anderson, Robert G. Bowman, Fred Basolo, and Robert L. Burwell Jr.Cite this: J. Am. Chem. Soc. 1975, 97, 18, 5125–5129Publication Date (Print):Septemb…
The adhesion of radio-labeled chick embryo muscle cells to the surfaces of radiation grafted hydrogels and other polymeric materials was measured in vitro. The degree of adhesion was determined by measuring the percentage of cells which remained adherent to the surfaces after 180 min of contact time (plating efficienc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel Compounds and 13C NMR Observation of Stereosequences of PolypropyleneA. Zambelli, P. Locatelli, G. Bajo, and F. A. BoveyCite this: Macromolecules 1975, 8, 5, 687–689Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Published inissu…
Intergranular stress corrosion cracking (SCC) of Inconel 600 is of concern to the nuclear power industry. Heat exchangers in commercial nuclear systems have shown SCC in only a fraction of a percent of the tubes in high temperature water, but laboratory SCC of Ni-containing alloys have been demonstrated by several res…
A series of thermoplastic urethane elastomers with soft segments of varying sequence length was prepared and their dynamic mechanical properties were characterized over a wide temperature range. The polymers were prepared using various molecular weight polycaprolactone diols as the soft segment and 4,4′-diphenylmethan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectrum and structure of matrix-isolated sulfur tetroxideRoger Kugel and Henry TaubeCite this: J. Phys. Chem. 1975, 79, 20, 2130–2135Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Published inissue 1 September 1975https://pu…
The high‐temperature oxidation behavior of a composite was investigated in the temperature range 1200°–1550°C and in oxygen partial pressures at 1400°C ranging from . Oxidation kinetics in pure oxygen were parabolic, with the rate constants exhibiting linear Arrhenius behavior. The rate of oxygen consumption is descri…
Transport processes in two types of composite media were investigated. In one type, exemplified by hydrogen diffusion in steel with microvoids present, short‐lived trapping reactions result in a lowering of the effective or overall diffusion coefficient. The other type of composite consists of randomly mixed parts or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic oxygen carrier. Dioxygen adduct of a manganese porphyrinCharles J. Weschler, Brian M. Hoffman, and Fred BasoloCite this: J. Am. Chem. Soc. 1975, 97, 18, 5278–5280Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Published iniss…
Raman spectra have been obtained from both the ε and γ polytypes of GaSe. The frequencies of the phonons at the zone center have been obtained for both compounds at 80 K and at 295 K. All modes have been assigned on the basis of their observed polarization dependence to an irreducible representation of the appropriate…
The effect of heat treatment on the microstructure of Li 2 O‐Al 2 O 3 ·SiO 2 glass‐ceramics which contain crystals of either Li 2 SiO 3 , Li 2 Si 2 O 5 , or both was investigated quantitatively. Strength determinations for abraded rods were correlated with heat treatment on the basis of both size and distribution of c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock copolymers, polymer-polymer interfaces, and the theory of inhomogeneous polymersEugene HelfandCite this: Acc. Chem. Res. 1975, 8, 9, 295–299Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Published inissue 1 September 1975https:/…
The wetting of several new materials for gas turbine engines, e.g. SiC, Si 3 N 4 , and C, by liquid Si and binary Si alloys containing Cu, Fe, and B was determined by the sessile drop method. All contact angles measured were < 90°. Hot‐pressed SiC, Si 3 N 4 , and Refel SiC are easily wet by Si; wetting is controlle…
Summary The structural stability of samples of 180 soils of known composition was examined by the Emerson test. This test is based on the swelling, slaking, and dispersion behaviour of soil aggregates when immersed in water and under mechanical stress. In the surface soils investigated there appeared to be a critical…
Kinetics and osmoregulation of cotton (Gossypium hirsutum L.) fiber growth (primarily extension) have been studied. Growth is dependent on turgor pressure in the fiber. It is inhibited when a decrease in the water potential of the culture medium due to an addition of Carbowax 6000, equals the turgor pressure of the fi…
Surface-potential decay characteristics of corona-charged insulators are analyzed theoretically. The effects of field-dependent drift mobility and injection efficiency, as well as time-dependent injection, are included. The theoretical results are compared with existing surface-potential decay data on polyethylene. At…
Composition and compressibility characteristics of Mexico City clay were investigated using samples with natural water contents in the range of 421–574%. The composition study included scanning electron microscopy, X-ray diffraction and chemical analyses, as well as measurements of physical properties. Compressibility…