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Abstract The effect of various addends on the specific viscosity of dilute aqueous unionized poly(methacrylic acid) (PMA) solutions, unionized poly(acrylic acid) (PAA) solutions, and poly(acrylic acmide) (PAAm) solutions was investigated. The addition of sodium and lithium chloride decreases the specific viscosity of…
Abstract Theoretical treatment had shown that syndiotactic propagation should be slightly favored energetically over isotactic propagation in free radical vinyl chloride polymerization. This prediction has been confirmed experimentally by x‐ray and infrared investigations of vinyl chloride polymers prepared at various…
A systematic survey of ionization-dissociation processes of fused-ring aromatic compounds is initiated. Mass spectra and appearance potentials of the singly and doubly charged molecule ions are reported. The observed ionization potentials of benzene (9.38 ev), naphthalene (8.26 ev), anthracene (7.55 ev), and phenanthr…
Electron transmission microscope observations have been carried out on copper irradiated with neutrons at temperatures of 35°c and 60°-100°c, and subsequently thinned by electropolishing. Specimens irradiated to a dose of 6.7 × 1017 cm−2 (at 35°c) contain ∼3 × 1016 defects c.c.−1 in the form of small regions of strain…
The variation of the thermal conductivity of uranium-impregnated graphite is measured continuously while under neutron irradiation. The temperature is continuously monitored and results are reported which show the effects of the uranium oxide particle size as well as the effect of the neutron bombardment as separated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe System Ga2O3–SiO2F. P. GlasserCite this: J. Phys. Chem. 1959, 63, 12, 2085–2086Publication Date (Print):December 1, 1959Publication History Published online1 May 2002Published inissue 1 December 1959https://pubs.acs.org/doi/10.1021/j150582a041https://doi.org/10.1021/j150…
Many electron micrographs were obtained for borosilicate glass which had been subjected to chemical attack after heat‐treatment at various temperatures and durations in order to study changes in internal structure, the so‐called “phase separation.” Both replica and direct‐transmission methods were applied to Vycor‐typ…
X-ray powder and rotation patterns of six cubic substances (W, Si, Cr, TiO, Al, and V) using specimens of different thickness were made; the patterns were measured, the lattice constants calculated and plotted against the θ angle or against the Nelson and Riley function. Such curves for thin mounts, semitransparent to…
Abstract The gelation induced by Co 60 gamma radiation in butadiene‐styrene copolymers, homopolymers, and mixtures of these homopolymers was studied by use of random crosslinking theory. The number of crosslinks formed per 100 e.v. of energy absorbed by the polymer, G(X) , was found to be 0.045 for polystyrene and 3.6…
An equation was derived which describes the pressure-time relationship that occurs at the end of a dead-ended or volume-terminated pneumatic transmission line following a sudden pressure change at its input. The two partial differential equations which are solved are basic for transient fluid flow in pipes and analogo…
Experiments and theory are described concerning the rupture of soap films and the continuous formation, by impinging jets, of quasi-stationary liquid sheets.
The rate of oxidation of silicon carbide was measured in an atmosphere of dry oxygen between 900° and 1600°C. The rate was studied by using a thermogravimetric apparatus and was found to be diffusion controlled. The products of oxidation were amorphous silica and cristobalite, depending on the temperature. The effect…
The thermal conductivity of a number of multi‐component systems has been determined as a function of composition and temperature. These were silicate glasses, MgO‐NiO, Al 2 O 3 ‐Cr 2 O 3 , UO 2 ‐UO 2+x ‐ThO 2, ZrO 2 ‐HfO 2 ‐CaO, MgO‐Mg 2 ‐SiO 4 , MgO‐BeO, Al 2 O 3 ‐mullite, MgO‐MgAl 2 O 4 , Al 2 O 3 ‐ZrO 2 , Al 2 O 3…
Abstract Solubilities and diffusivities of N 2 , O 2 , CO 2 , and He in a variety of polyethylenes were measured in the temperature range 0–50°C. Polyethylene films studied covered a range of crystallinities (43–82%) and branching indices, and were prepared under a variety of known thermal histories. Diffusivities wer…
The absorption spectra of evaporated films of the alkali halides, with the exception of LiF, have been measured at room temperature and 80\ifmmode^\circ\else\textdegree\fi{}K in the region from 1100 A to 2500 A. The spectra are rather complex at low temperature, but agree fairly well with current theory concerning the…
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