Materials Literature
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Abstract This study was undertaken to measure quantitatively the flammability characteristics of cotton and polyester fibers. The smoke density generated during the burning of these fabrics was also studied at various temperature conditions. A mathematical relationship was established between the results obtained in a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-Scattering Studies on Polystyrene-Polyisoprene Block CopolymersJ. Prud'homme and S. BywaterCite this: Macromolecules 1971, 4, 5, 543–548Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https://pub…
Abstract The γ‐alumina polymerization of furfuryl alcohol produces a polymer differing in structure from that obtained by polymerization with acid catalysts. In order to gain a better understanding of the basic chemistry of this method of polymerization furfuryl alcohol, studies were done, both with γ‐alumina‐polymeri…
Abstract Through the use of accelerators containing higher alkyl substitution, we have been able to attain improved properties of EPDM diene rubber blends. EPDM/NBR blends vulcanized with sulfur cure systems employing these accelerators compete favorably with CR compounds in heat aging; have essentially the same oil r…
The polarized optical spectrum of Er3+ in calcium tungstate at 4.2 and 77°K is reported. Radial integrals and spin-orbit coupling parameter derived from fitting the position of the centers of gravity of the J manifolds in intermediate coupling are F2=423.89 cm−1, F4=67.995 cm−1, F6=6.667 cm−1, ζ=2377 cm−1. A first-ord…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotentiometric study of the dissociation of the tetrachloroaluminate ion in molten sodium chloroaluminates at 175-400.deg.G. Mamantov and G. TorsiCite this: Inorg. Chem. 1971, 10, 9, 1900–1902Publication Date (Print):September 1, 1971Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImidazole Complexes as Hardeners for Epoxy AdhesivesR. Dowbenko, C. C. Anderson, and W. -H. ChangCite this: Ind. Eng. Chem. Prod. Res. Dev. 1971, 10, 3, 344–351Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 Septemb…
Abstract The special performance properties noted for silane coupling agents in mineral filled EPDM compounds result from the interfacial effects related to the dual function reaction of the organofunctional silane. When common alkoxy substituted vinyl silanes are used, the nature of the hydrolyzable groups on the sil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of steric interactions on endo stereoselectivityK. N. Houk and L. J. LuskusCite this: J. Am. Chem. Soc. 1971, 93, 18, 4606–4607Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https://pubs.acs…
Abstract The optical absorption spectrum of B 12 C 3 exhibits an indirect interband transition with onset at h ω = (0.48±0.03) eV. In the subsequent region of lower absorption (α ∼ 400 cm −1 ) traps of great density are essentially effective for the optical properties. The lattice vibration spectrum starting at 4 μm h…
The high oxygen pressure conductivity of high‐purity single‐crystal magnesium oxide at high temperatures varied as the 1/4 power of the oxygen partial pressure with a 3 eV activation energy; the low pressure conductivity varied as the ‐1/6 power of the pressure with an activation energy of 4 eV. The predominant defect…
We present new measurements of thermoelectric power for nickel and cobalt dilute alloys with d transition elements in two temperature ranges: from 1.3 to 4.2 K and from 77 to 300 K. We analyse the measurements at room temperature in a two-band conduction model and deduce the thermopowers associated with the matrix ( S…
If open-end spun yarns are to find wide use, it is necessary to understand more fully the structure of the yarns. The differences in structure arise because of the manner in which the yarn is made. Bridging fibers are converted into hooks in the spinning process and this reduces the effective fiber length in the yarn.…
The rate constants and products from the interaction of the first triplet state of nitrogen, N2(A 3Σu+), with C2H4 and cis-C4H8 have been measured in a discharge flow apparatus. The reactions are fast with rate constants near 1014 cc mole−1·sec−1 and give products which are typical of other triplet—triplet donor react…
Barium titanate powders with average grain sizes of 0.07 and 0.65 μm were coated with an organic Nb ester, using a liquid‐solid mixing process. Small‐grained (1 to 3 μm) ceramic dielectrics from both powders and large‐grained (>50 μm) dielectrics from the 0.65 μm powder were fired using 0 to 2 at.% Nb. Microstructu…
Sharp no-phonon lines associated with phonon sidebands have been observed in 4 f -5 d excitation spectra for Tb 3+ and Ce 3+ as well as in emission spectra of Ce 3+ , in Sc, Y and Lu orthophosphates at low temperatures. The spectra manifest themselves as if the 5 d electron did not see the tetragonal field component.…
Although some reports of the water-resisting life of polyethylene-insulated wires have been made, studies of mechanism of the deterioration phenomenon have been scarcely reported. In this paper, it is pointed out that a major cause of the deterioration of polyethylene-coated wire in water is the occurrence of the "tre…
Calculations of $\ensuremath{\alpha}$-particle stopping cross sections based on the theories of Lindhard et al. using the Hartree-Fock-Slater atomic-charge distribution provide generally good agreement with previously obtained experimental results. In particular, the calculations are helpful in understanding the struc…
A method is suggested for systematically obtaining model potentials that accurately reproduce spectroscopic or scattering data. Applications are made to atomic systems consisting of one electron outside a closed shell for the closed shells Li + , Na + , K + , He and Ne.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSo-called "ladder structure" of equilibrated phenylsilsesquioxaneC. L. Frye and J. M. KlosowskiCite this: J. Am. Chem. Soc. 1971, 93, 18, 4599–4601Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https:…