Materials Literature
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A method for the determination of the fracture energy of brittle plastics is described. A crack is propagated down the length of a rectangular specimen under controlled conditions and the variation of crack opening with length determined. From these results the fracture energy may be calculated The method has been app…
Abstract The crosslinking efficiency of dicumyl peroxide was investigated with the use of 2,6‐dimethyl‐2,6‐octadiene as a model polyisoprene. High‐temperature gas chromatography was used to determine quantitatively the amount of crosslinked products as well as the decomposition products of the peroxide, α,α‐dimethylbe…
The paucity of information about the fine structure of cuticle cells, in animal hair and wool fibres, has been a major factor in the general failure to advance a theory capable of explaining quantitatively the origin of the Directional Frictional Effect.Electron microscope studies have been made covering : (i) surface…
Experimental and theoretical studies are described which clarify the nature and importance of the chemical and physical processes tha t occur in the ablation of these materials. Products and amount of gas from resin pyrolysis are determined from tube furnace tests, the rate of the process is inferred, heat effects are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure-Volume-Temperature Properties of Sulfur Dioxide.T. L. Kang, L. J. Hirth, K. A. Kobe, and J. J. McKettaCite this: J. Chem. Eng. Data 1961, 6, 2, 220–226Publication Date (Print):April 1, 1961Publication History Published online1 May 2002Published inissue 1 April 1961h…
Abstract Two disiloxane benzimidazole polymers are described. These materials show increased solubility and lower softening points than the previously described fully aromatic benzimidazole polymers. The synthesis of the required disiloxane monomers is given.
The lattice model of a polymer molecule with excluded volume and nearest-neighbor forces arising from polymer-solvent interaction is investigated by exact numerical calculation for short chains of up to about ten links. Extrapolation to large values of n, the number of links, is shown to be justified and enables the m…
Abstract During the last thrity years, dielectric measurements have been employed extensively to provide a better understanding of the interactions between polymer and plasticizer in various thermoplastic formulations. Recently, a series of melamine resins, plasticized to the extent that shrinkage and internal stress…
Abstract Inconel 718 is an age-hardenable nickel-chromium alloy having exceptionally high tensile, yield, creep, and rupture strength at temperatures up to 1300 F. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive strength as well as fatigue. It al…
Abstract The photochemical isomerization of cis as well as trans-stilbene in n-hexane was studied kinetically in the temperature range 10∼30°C using the mercury lines of 313 and 334 mμ. Quantum yields were found to be 0.04 for the cis→trans, and 0.27 for the trans→cis conversion. Conversion rates for both directions o…
Using a silver – silver chloride reference electrode, the electrode potentials of the system U, UCl 3 (KCl, NaCl) and the redox potentials of the system Pt, UCl 3 , UCl 4 (KCl, NaCl) were measured at various concentrations of the uranium chlorides and at temperatures between 650 and 850 °C.From the results, the electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE HYDROGEN VIBRATIONS IN COBALT CARBONYL HYDRIDE. BONDING CONSIDERATIONS.1Walter F. Edgell and Robert SummittCite this: J. Am. Chem. Soc. 1961, 83, 7, 1772–1773Publication Date (Print):April 1, 1961Publication History Published online1 May 2002Published inissue 1 April 196…
Abstract The types of anode and cathode reactions commonly found in corrosion by aqueous media are described, and the combination of these reactions in corroding and in passivated systems is discussed. The principal ways in which corrosion rates are increased or decreased are classified and discussed, as follows: anod…
The thermoelectric parameters α, 1/ρ, and 1/(K−Ke) of oriented polycrystals increase as the freezing rate decreases and as the temperature gradient in the liquid at the interface increases. The effects are primarily attributed to the variation in the degree of microsegregation produced in the crystals as a function of…
The transmission and degree of polarization of a quarter-wave stack of non-absorbing films deposited on a transparent substrate is expressed in terms of two variables. One variable is a function only of the refractive indices of the layers, the incident medium, and substrate ; the other variable depends on the angle o…
By utilizing the first positive bands of nitrogen to monitor the decay of atomic nitrogen caused by diffusion to a catalytic surface, the diffusion coefficient of atomic nitrogen in molecular nitrogen has been investigated, leading to a probable value of 280/p cm2 sec—1. The catalytic efficiency γ of silver and copper…
The heat capacities of ZrH2 and ZrD2 were measured in an adiabatic type calorimeter from 5 to 350°K. X-ray analyses showed the hydrides consist of a single face-centered tetragonal phase. The data for both compounds below 11°K were found to fit the equation Cv=9.8×10—4T+464.6(T/θ)3 cal deg—1 mole—1, where θ=311.4, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterstitial Compounds of BoronV. I. MatkovichCite this: J. Am. Chem. Soc. 1961, 83, 8, 1804–1806Publication Date (Print):April 1, 1961Publication History Published online1 May 2002Published inissue 1 April 1961https://pubs.acs.org/doi/10.1021/ja01469a008https://doi.org/10.1…
A Patterson sunnnation with {IF(hkl)l-IF(~kZ)I} ~ coefficients gives peaks at the end of vectors relating the anomalous scatterers in the structure. Application to two mercury derivatives of horse haemoglobin, using Cu Ka diffraction data, shows that the ends of vectors between mercury atoms can be recognized easily,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurements of Transverse Dispersion in Granular Media.F. GraneCite this: J. Chem. Eng. Data 1961, 6, 2, 283–287Publication Date (Print):April 1, 1961Publication History Published online1 May 2002Published inissue 1 April 1961https://pubs.acs.org/doi/10.1021/je60010a031http…