Materials Literature
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Abstract New methods of measuring the conductivity and diffusivity of rubbers from ambient to 250°C have been developed. The method of measuring diffusivity described in this paper is simple to use and very much quicker than previous methods, the whole temperature range being covered in about half an hour. The accurac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclophanes. 9. anti-[2.2](2,6)Azulenophane. Synthesis and charge-transfer interactionRoberta Luhowy and Philip M. KeehnCite this: J. Am. Chem. Soc. 1977, 99, 11, 3797–3805Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 M…
Liquid crystals having favorable transition temperatures have been discovered in the selenol esters of type (1). Their properties should be further enhanced by variation of R1 and R2.
Abstract The composition of the mixture of volatile products formed during the oxidation in air of natural rubber or synthetic cis -polyisoprene in the raw state was investigated in order to obtain further information on the mechanism of chain scission. An important observation was made: in order to obtain, by means o…
The sintering model presented in Part I is extended by considering a Gaussian distribution of pore sizes in the body. The effect of the breadth of the distribution on the densification kinetics is demonstrated; this effect is small except for very broad distributions. The greatest change occurs in the last few percent…
Temperature‐controlled seawater columns were used to investigate settling rates of Ditylum brightwelli grown on light‐dark schedules. Ficoll density gradient centrifugation was used to examine the effects of KCN, DNP, and the ion‐transport modifiers valinomycin, nigericin, and gramicidin on sedimentation characteristi…
Abstract Bench‐scale equipment for wet spinning was designed and built. An experimental study of the wet spinning of several polyamides has been carried out. The polymers studied include nylon 6, nylon 66, redissolved Nomex, and redissolved Kevlar. The superstructure of the wet‐spun fibers were studied by optical and…
Abstract Criteria for minimizing hysteresis in carbon-black-filled elastomer blends are: (1) large black unit size, wide distribution, and low structure; (2) higher black loading in the discrete polymer phase (large zones); and (3) polymer of lower hysteresis as the continuous phase (low black loading). Of the differe…
Abstract This study tested the hypothesis that the level of available P in volcanic ash soils is a rate‐limiting factor for organic matter mineralization. Additions of calcium phosphate to give levels of P of 1,200 and 2,400 ppm significantly increased the amount of N mineralized and CO 2 evolved as compared to soils…
Microscopic studies on thermally induced undulation instabilities of the smectic $C$ phase of pentyloxybenzylideneheptylaniline ($\overline{5}\mathrm{BA}7$) and pentylphenyloctylthiobenzoate ($5\mathrm{PTB}\overline{8}$) are reported. The $A\ensuremath{-}C$ transitions of these compounds appear to be second order. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOccurrence of N-methyl-N-formylhydrazones in fresh and processed false morel, Gyromitra esculentaHeikki Pyysalo and Aimo NiskanenCite this: J. Agric. Food Chem. 1977, 25, 3, 644–647Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published in…
Infrared and Raman spectra were measured and interpreted for two crystalline VPO 5 phases (α- and β-VPO 5 ) and several related vanadium phosphate glasses. The spectral results for the crystalline phases were consistent with those predicted by factor group analysis using the previously determined space groups. Empiric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Model for the Kinetics of Plasma PolymerizationJ. M. Tibbitt, R. Jensen, A. T. Bell, and M. ShenCite this: Macromolecules 1977, 10, 3, 647–653Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 May 1977https://pubs.acs.org/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge distribution in large polyoxoanions: determination of protonation sites in vanadate (V10O286-)by oxygen-17 nuclear magnetic resonanceW. G. Klemperer and Wilfred ShumCite this: J. Am. Chem. Soc. 1977, 99, 10, 3544–3545Publication Date (Print):May 1, 1977Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydridorhodium(III) porphyrin and porphyrin rhodium(II) dimerH. Ogoshi, J. Setsune, and Z. YoshidaCite this: J. Am. Chem. Soc. 1977, 99, 11, 3869–3870Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 May 1977https://pubs.ac…
Densification rates are reported for 3 classes of porous glass materials: soot preforms made by flame hydrolysis, silica gel, and phase‐separated and leached borosilicate glass. Viscosity values obtained by fitting the densification data to the theory of Part I of the present study are in reasonable agreement with vis…
The thermal expansion coefficient and aqueous dissolution rate were measured for alkali phosphate glasses containing a third and fourth component. For a given series, both properties increased monotonically as the radii of the alkali ions increased. The observed expansion coefficients were in the range 99 to 286 × 10…
The effect of molybdate ions on the repassivation kinetics of iron has been studied by measuring anodic current transients following in situ film removal by abrasion. In solutions containing both chloride and molybdate ions, it was found that although pits initiate, they do not propagate when molybdate ions are presen…
Results of calculations of vibrational densities of states and of infrared and Raman spectra for relatively large model structures representing elemental amorphous semiconductors are presented and discussed. Models for four-coordinated (germanium-like), three-coordinated (arsenic-like), and two-coordinated (selenium-l…
The solar absorptance of a single ideal film on an idealized metallic substrate has been calculated as a function of its optical constants to determine the optimum parameters for selective absorber applications. High normal solar absorptances (>0.9) are possible for single uniform interference films if n < 1.5 and 0.2…