Materials Literature
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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…
Abstract The interaction between fumed silica and silicone elastomer after various treatments of the silica surface has been investigated. The effect of the treatments was determined by measuring bound rubber, an interaction coefficient by means of the oscillating disk rheometer, the mechanical properties of the vulca…
Abstract Experimental studies of structure development in melt spinning of polyethylene and polypropylene fibers are described. Emphasis is given to the influence of applied stresses on the rates of crystallization and on the development of crystalline morphology. The relationship of fiber morphology to mechanical pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNicotinamide adenine dinucleotide (NAD+) and related compounds. Electrochemical redox pattern and allied chemical behaviorConrad O. Schmakel, K. S. V. Santhanam, and Philip J. ElvingCite this: J. Am. Chem. Soc. 1975, 97, 18, 5083–5092Publication Date (Print):September 1, 197…
We describe and present results of a numerical method we have used to solve the hydrodynamic equations with negligible rates of change of momentum and angular momentum, but without other approximations, in a liquid-crystal twist cell. We verify that the ’’bounce’’ in transmission of normally incident light that is obs…
We have studied the structures of adducts formed between subtilisin BPN' and both benzeneboronic acid and 2-phenylethaneboronic acid by x-ray diffraction techniques. Electron density and difference maps at 2.5 A resolution were computed with phases calculated from a partially refined structure of the native enzyme (R…
Abstract A Deborah number is introduced as a means of characterizing diffusional transport in amorphous polymer‐solvent systems. Two types of temperature‐penetrant concentration diagrams are constructed, and the various regions on these figures are identified by their Deborah number values. The utility of the diffusio…
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