Materials Literature
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Abstract The reaction of toylene diisocyanate (80/20 mixture of 2,4 and 2,6‐isomer) with a secondary hydroxyl‐containing polyoxypropylene triol was studied in the presence of numerous compounds to test their catalytic effect on the reaction. The reaction was studied by determination of the gelation time of the reactio…
Thin insulating films, less than 100 A thick to a few thousand angstroms, were produced by bombarding a substrate with electrons in the presence of silicone oil vapor. The rate of deposition of the solid film was found to depend on the substrate temperature, electron beam current density, and oil vapor pressure. A the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelix [UNK] Coil Transitions in Dilute Aqueous Collagen Solutions1Paul J. Flory and Edwin S. WeaverCite this: J. Am. Chem. Soc. 1960, 82, 17, 4518–4525Publication Date (Print):September 1, 1960Publication History Published online1 May 2002Published inissue 1 September 1960ht…
Wire grids have been fabricated with microscopic elements and periodicity. These wire grids behave as linear polarizers over large portions of the infrared spectrum, confirming predictions from electromagnetic theory. The method of fabrication of grids with periods as small as 463 mμ is described. Limits on the perfor…
Twin-domain walls in large crystals of antiferromagnetic NiO have been observed by specular reflection in optically polished and annealed crystals. These walls can be moved in annealed crystals by small mechanical stresses (<106 d/cm2) or by moderate magnetic fields (<25 000 oe) to yield completely untwi…
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Magnetic properties of single crystals of CrBr 3 have been measured with a magnetic balance and also with a torque magnetometer. The ferromagnetic Curie point has been found to be 37°K from the temperature dependences of magnetization and of torque. Based on the data of the magnetic susceptibility above the Curie poin…
The magnetic properties of single crystals of hausmannite (${\mathrm{Mn}}_{3}$${\mathrm{O}}_{4}$) have been investigated between 4.2\ifmmode^\circ\else\textdegree\fi{}K and the ferrimagnetic Curie point at 41.9\ifmmode^\circ\else\textdegree\fi{}K. The $c$ axis was found to be the hard direction of magnetization and th…
Enormous capture cross sections in the range ${10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ to ${10}^{\ensuremath{-}12}$ ${\mathrm{cm}}^{2}$ have been observed for a wide variety of Coulomb attractive centers in Si and Ge, some involving binding energies many times the Debye energy. Whereas multiphonon transitions to t…
The crystal structure of β-Ga2O3 has been determined from single-crystal three-dimensional x-ray diffraction data. The monoclinic crystal has cell dimensions a=12.23±0.02, b=3.04±0.01, c=5.80±0.01 A and β=103.7±0.3° as originally reported by Kohn, Katz, and Broder [Am. Mineral. 42, 398 (1957)]. There are 4 Ga2O3 in th…
Single crystals of uranium dioxide were deformed in compression at 700 to 1900 deg C. The most active slip plane at all temperatures was {100}, with {110} and {111} becoming more active as the temperature was increased. The slip direction for {100} slip was determined as. Fracture occurred on {111} planes with a singl…
The crystal structure of the R phase in the Mo-Co-Cr system, with atom ratio 30. 4-51.3-18.3, has been determined by single-crystal X-ray diffraction analysis. The crystal has space group C~i-R-3, with 53 atoms per rhombohedral cell. The rhombohedral lattice constants are a 0 = 9.011 /~, a = 74 27"5', hexagonal lattic…
Abstract The reaction mechanism of the ozone attack of SBR copolymers was studied to obtain information for use in the development of elastomeric materials having improved resistance to deterioration in service. Techniques of ultracentrifugation and viscometry were utilized to follow molecular changes induced by ozone…
This paper reports continued studies of the tensile properties of twisted continuous-filament viscose rayon, Tenasco, acetate, nylon and Terylene yarns, with particular reference to the influence of twisting tension, the differences between ring-twisted and uptwisted yarns, values of the work of rupture and the yarn c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical Rotatory Dispersion Studies on Polysaccharides. II. Conformation of Partially Methylated Cellulose in Solution1Brock NeelyCite this: J. Am. Chem. Soc. 1960, 82, 16, 4354–4357Publication Date (Print):August 1, 1960Publication History Published online1 May 2002Publishe…