Materials Literature
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A model is proposed for the structure of a cross-linked network, such as exists in a vulcanized rubber, which is amenable to statistical treatment. Expressions are derived for the structural entropy of the network, and for the entropy change on deformation. The latter is in agreement with the relationship derived by W…
The interaction of solvents with cross-linked network structures, such as occur in vulcanized rubber, is subjected to a statistical mechanical treatment based on the model and procedure presented in the preceding paper. The activity of the solvent is expressed as a function of its concentration in the swollen network,…
A friction met er is described, and its application to t he evaluation of the smoothness of a wide vari ety of fa brics is discussed. The ruggedness, sensit ivit.y, and ease of operation of the instrumen t make it sui table for the routine testing of fabrics, the evaluation of fini shing agents, and the control of fin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSorption and Surface Area in Silica AerogelS. S. Kistler, E. A. Fischer, and I. R. FreemanCite this: J. Am. Chem. Soc. 1943, 65, 10, 1909–1919Publication Date (Print):October 1, 1943Publication History Published online1 May 2002Published inissue 1 October 1943https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron Alloy ScalingM. J. Day and G. V. SmithCite this: Ind. Eng. Chem. 1943, 35, 10, 1098–1103Publication Date (Print):October 1, 1943Publication History Published online1 May 2002Published inissue 1 October 1943https://pubs.acs.org/doi/10.1021/ie50406a017https://doi.org/10.1…
Hilda F. Rosene; Quantitative Measurement of the Velocity of Water Absorption in individual Root Hairs By a Microtechnique, Plant Physiology, Volume 18, Issue 4
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Role of Glycine in Protein StructureHans NeurathCite this: J. Am. Chem. Soc. 1943, 65, 10, 2039–2041Publication Date (Print):October 1, 1943Publication History Published online1 May 2002Published inissue 1 October 1943https://pubs.acs.org/doi/10.1021/ja01250a504https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBoron. I. Preparation and Properties of Pure Crystalline BoronA. W. Laubengayer, D. T. Hurd, A. E. Newkirk, and J. L. HoardCite this: J. Am. Chem. Soc. 1943, 65, 10, 1924–1931Publication Date (Print):October 1, 1943Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Form of Crystalline XylitolJ. F. Carson, S. W. Waisbrot, and F. T. JonesCite this: J. Am. Chem. Soc. 1943, 65, 9, 1777–1778Publication Date (Print):September 1, 1943Publication History Published online1 May 2002Published inissue 1 September 1943https://pubs.acs.org/doi…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
T able OF C ontents I, Introduction. II, Physical Extraction: (1) classifying, (2) calcination, (3) hydration, (4) leaching, (5) flotation, (6) crystallization, and (7) miscellaneous physical methods. III, Chemical Extraction: (1) forming carbonates and formates, ( A ) carbon dioxide, ( B ) carbonates, and ( C ) carbo…
Abstract 1. Es werden die Bedingungen zur Herstellung reiner, rückstandsfreier NaCrS 2 ‐ und KCrS 2 ‐Präparate untersucht.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Studies of Reactions of Cellulose in Non-Aqueous Systems. II. Interaction of Cellulose and Primary Amines1W. E. Davis, A. J. Barry, F. C. Peterson, and A. J. KingCite this: J. Am. Chem. Soc. 1943, 65, 7, 1294–1299Publication Date (Print):July 1, 1943Publication History…
Abstract Measurements of specific heat were made on a sample of Hycar-OR synthetic rubber from 15° to 340° K by means of an adiabatic vacuum-type calorimeter. The experimental values of the specific heat between 15° and 22° K were well represented by the Debye specific-heat equation, using a βν value of 80 and, accord…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermolecular Forces and Chain Configuration in Linear Polymers—The Effect of N-Methylation on the X-Ray Structures and Properties of Linear PolyamidesW. O. Baker and C. S. FullerCite this: J. Am. Chem. Soc. 1943, 65, 6, 1120–1130Publication Date (Print):June 1, 1943Publica…
A bstract Evidence for the existence of a “transformation region” rather than a “transformation point” in the 10 14 poise range of glasses has been produced by a variety of experiments, both static and dynamic. Refractive index was measured (1) on small specimens quenched in air and (2) directly in the furnace by the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Diagram of the System Iron—Tin1,2W. F. Ehret and D. H. GurinskyCite this: J. Am. Chem. Soc. 1943, 65, 6, 1226–1230Publication Date (Print):June 1, 1943Publication History Published online1 May 2002Published inissue 1 June 1943https://pubs.acs.org/doi/10.1021/ja01…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Pb3O4S. T. GrossCite this: J. Am. Chem. Soc. 1943, 65, 6, 1107–1110Publication Date (Print):June 1, 1943Publication History Published online1 May 2002Published inissue 1 June 1943https://pubs.acs.org/doi/10.1021/ja01246a029https://doi.org/10.1021/ja0…
This paper summarizes the results obtained thus far in an intensive study of the manganese oxide minerals. X-ray powder photographs, supplemented by chemical tests, have proved to be the best means for identifying these minerals. Formulas are suggested. Physical properties and X-ray data are listed for the commoner mi…
If a rod is twisted while subjected to longitudinal compression it will support without fracture angles of twist many-fold greater and maximum torques somewhat greater than is possible in the absence of load. Under compressional load the curve of shearing stress against shearing strain rises to a maximum and then sink…