Materials Literature
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Three clay minerals, a kaolinite, an illite and a montmorillonite, were saturated with different cations (Li + , Na + , K + , Mg ++ , Ca ++ , Sr ++ , and Ba ++ ) before equilibration with dilute phosphorus solutions. The phosphorus adsorption data conformed to the Langmuir adsorption isotherm. The relative magnitude o…
Ester cross linkages in cotton cellulose have been investigated for mobility (trans esterification) at elevated temperature. Cotton cellulose polycarboxylates were prepared by reaction of cotton print cloth with polycarboxylic acids having 3-6 carboxyl groups per molecule, at least two of the carboxyl groups being on…
Stacking faults and dislocation dissociations on {011} and {121} planes in body-centred cubic lattices are examined. The effect of stress on the threefold dissociation of screw dislocations on {121} planes is studied in detail. A change in configuration occurs on reversal of stress, as in tension and compression exper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential functions and the bonding in the XCO free radicalsJames S. Shirk and George C. PimentelCite this: J. Am. Chem. Soc. 1968, 90, 13, 3349–3351Publication Date (Print):June 1, 1968Publication History Published online1 May 2002Published inissue 1 June 1968https://pubs.a…
The deformation microstructures associated with aluminium after shock loading and cold rolling at room temperature and at liquid nitrogen temperature are presented and discussed. A high density of point defects is produced by shock loading aluminium and it is observed that vacancy-produced dislocation loops are more n…
Steady-state and time-transient measurements of the decay of oxygen atoms in a cylinder with catalytic walls have been used to determine the diffusion coefficient of atomic oxygen in O2, He, Ar, and Kr. The relative change in atom density as a function of distance (under steady-state conditions) and time (after the at…
Electrical conductivities of binary alkali and thallous silicate glasses have been measured as a function of composition, temperature, and frequency. The best approximation to the activation energy for dc conduction can probably be obtained by extrapolating its frequency dependence to zero frequency, although values o…
Abstract The thermodynamic properties of crystalline and amorphous poly(2,6‐dimethyl‐1,4‐phenylene ether) (PPO Registered trademark of General Electric Company. polymer, General Electric Co.) have been studied calorimetrically between 80 and 570°K. The calculated configurational entropy of this polymer, of similar mag…
Abstract The submicroscopic morphology of uniaxially deformed isotactic polypropylene films has been examined by small‐angle light scattering (SALS), electron microscopy, optical microscopy, small‐angle x‐ray scattering (SAXS), wide‐angle x‐ray diffraction, birefringence, sonic modulus, and density methods. Several ne…
The dyebanding and tattooed patch techniques of estimating wool production were compared in three experiments, and in two of these, mean diameters of wool fibres taken from the tattooed patches and from the dyebands were also determined. There were significant differences at some times of the year between the two esti…
It is shown that a free-volume treatment of the relaxational behavior of a polymer can be extended into the glassy region. A modified form of the WLF equation is derived in which the temperature is replaced by Te, a parameter related to the “frozen” free volume in the glass and defined such that Te = T at equilibrium.…
Abstract The ceric ion‐cellulose redox system has been studied for grafting acrylonitrile on cotton fibers. Grafting yields are very high as compared to the persulfate‐thiosulfate redox system reported earlier. Traces of copper sulfate in the reaction mixture do not increase grafting yields, unlike the persulfate‐thio…
Abstract The energy component of the stress has been determined for poly(vinyl alcohol) networks in swelling equilibrium with a series of water–ethylene glycol compositions. The data are analyzed by using the equations describing the thermoelasticity of networks in swelling equilibrium. The ratio f e / f of the energy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on the photoaddition of diphenylacetylene to 1,4-naphthoquinonesS. P. Pappas and Norman A. PortnoyCite this: J. Org. Chem. 1968, 33, 6, 2200–2203Publication Date (Print):June 1, 1968Publication History Published online1 May 2002Published inissue 1 June 19…
1. Experiments were conducted on isolated and in situ hearts of 4 species of tunicates in order to investigate beat reversal. The mechanical and electrical properties of in situ and isolated hearts were found to be the same. The intracardiac pressure was found to affect the excitability of pacemakers and it could be a…
The crystal structure of trans-1,4-polybutadiene has been reported by Natta et al. to be pseudo-hexagonal below its solid-phase transition temperature. In the present X-ray structure analysis, it is revealed that the crystal belongs to the monoclinic system with the space group P21/a. The unit cell, with the lattice c…
It is shown theoretically that, for non-Kramers paramagnetic ions, the second-order Raman phonon process gives a spin–lattice relaxation rate varying as T 5 at low temperatures. This new relaxation rate for non-Kramers ions is similar to the one discussed by Orbach and Blume for multilevel Kramers ions. An unusual fea…
Incoloy(1) nickel-iron-chromium Alloy 825 can become sensitive to intergranular attack by exposure to temperatures in the 1200-1400 F (649-760 C) range. Sensitivity to intergranular attack (as measured by the Huey test) can be correlated to the presence of a chromium-depleted area adjacent to the grain boundary. This…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe disordered and β-conformations of silk fibroin in solutionEisaku. Iizuka and Jen Tsi. YangCite this: Biochemistry 1968, 7, 6, 2218–2228Publication Date (Print):June 1, 1968Publication History Published online1 May 2002Published inissue 1 June 1968https://pubs.acs.org/doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of carbon macrocycles to C120E. Wasserman, D. A. Ben-Efraim, and R. WolovskyCite this: J. Am. Chem. Soc. 1968, 90, 12, 3286–3287Publication Date (Print):June 1, 1968Publication History Published online1 May 2002Published inissue 1 June 1968https://pubs.acs.org/doi/…