Materials Literature
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Previous theories describing the phase behavior of copolymer blends have ignored the sequence distribution of monomer unit.a in the copolymer. We introduce a parameter, 8, that describes the binary sequence distribution of the monomers in a copolymer chain. By varying 8, we can describe a block, random, or alternating…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of the [(.eta.5-C5H5)Ti(Mo5O18)]3- and [(.eta.5-C5H5)Ti(W5O18)]3- anionsT. M. Che, V. W. Day, L. C. Francesconi, M. F. Fredrich, W. G. Klemperer, and W. ShumCite this: Inorg. Chem. 1985, 24, 24, 4055–4062Publication Date (Print):November 1, 1985Public…
Cracks in soda‐lime‐silica and vitreous silica glass close against a finite load at humidities between 0.01 % and 100%. The force associated with crack closure (0.15 J/m 2 ) can be predicted by a model which involves hydrogen‐bonded linkages of surface‐adsorbed water molecules. The fracture energy to reopen healed cra…
Binuclear phthalocyanines in which the two phthalocyanine nuclei are covalently linked through four-atom bridges, derived from catechol, have been prepared and characterized. Metal-free 2,9,16,23-tetra-(3,3-dimethylbutyl)phthalocyanine and 2,9,16,23-tetra-(2-trimethylsilylethyl)phthalocyanine were prepared as examples…
Preparation of amorphous silica doped with organic dye molecules, 1,4-dihydroxyanthraquinone, and the observation of the amorphous structure of this system by photochemical hole burning using the dye molecules as a spectral probe are reported. The various kinds of organic molecule-doped inorganic glassy materials are…
The ignition and burn times for lightweight (< 4oz/yd 2 ) all cellulosic, polyester/ cotton, and polyester/rayon fabrics held at 45° and in the vertical mode were measured and compared using modifications of the CS 191-53 test method. Sur face ignition times increased with increasing fabric weight but were essentia…
Time-differential perturbed-angular-correlation measurements and M\"ossbauer-effect measurements have been made on the Heusler alloy ${\mathrm{Ni}}_{2}$MnGa. The magnitude and sign of the magnetic field extrapolated to 0 K at $^{119}\mathrm{Sn}$ at the Ga site $^{111}\mathrm{Cd}$ at the Ni and Ga sites, and $^{99}\mat…
From domain investigations reported in the literature, it is concluded that the scanning electron microscope (SEM) technique, while revealing the main domain structure in a satisfactory way, gives little information about supplementary domains in the case of commercially coated sheets. It is demonstrated that even mor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of the triphosphorus, triarsenic, and triantimony units in a nortricyclane skeletonRolf Gleiter, Horst Koppel, P. Hofmann, H. R. Schmidt, and J. EllermannCite this: Inorg. Chem. 1985, 24, 24, 4020–4023Publication Date (Print):November 1, 1985Publication…
Varved clays deposited in proglacial Lake Ojibway at Matagami, Quebec, were derived from two source areas: carbonate-deficient, Precambrian crystalline igneous rocks from New Quebec to the east and carbonate-rich Palaeozoic rocks from the James Bay lowlands in Ontario to the west. About 50% of the 12–15 m thick clay s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect proton transfer between hydrocyanic acid and nitrogen and oxygen basesRodney A. Bednar and William P. JencksCite this: J. Am. Chem. Soc. 1985, 107, 24, 7126–7134Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Published inissue 1…
A quantitative subjective scale of measurement of fabric stiffness called ‘Stifs’ is described. This is based on the easily measured and readily convertible quantitative objective measurement known as the drape coefficient.
The effects on the reciprocal space of one or more pseudotranslations occurring in a crystal structure are studied. A quantitative theory is described, which gives full account of the subsets of pseudonormalized structure factors whose mean intensity significantly deviates from unity. Conversely, statistical criteria…
The authors report partial and total photoionization cross sections as well as the asymmetry parameter for ionization of the 2σ<SUB>g</SUB>, 2σ<SUB>u</SUB>, and 1π<SUB>u</SUB> orbitals of the ground X <SUP>1</SUP>Σ<SUB>g</SUB><SUP>+</SUP> state of the carbon molecule C<SUB>2</SUB>, which is found in a variety of astro…
A simple model is employed to explain the anomalous surface-flashover characteristics observed when insulators in vacuum are stressed with bipolar voltage waveforms. Under unipolar stress, the flashover field is found to vary as the inverse square root of the prebreakdown time delay over the first few tens of nanoseco…
A theoretical analysis (subject to some assumptions) of the principles of seam slippage in woven fabrics is presented. It is shown that the amount of seam slippage, or fabric resistance to seam slippage, depends on such factors as yarn-to-yarn friction, yarn-to-sewing-thread friction, yarn flexural rigidity, and stitc…
The crystallographic restriction in dimensions two and three is generalized to arbitrary dimensions. It is shown that m can occur as the order of an element of the point group of an n-dimensional space group if and only if Φ(m) ≤ n where Φ is an additive version of Euler's totient function. A table of these allowable…
Three hydrogel formulations consisting of 2-hydroxyethyl methacrylate (HEMA) copolymerized with N-vinyl pyrrolidone (NVP) were incorporated into silicone rubber by irradiation-induced polymerization. These coatings were chosen to represent different degrees of hydrophilicity, and they changed the hydrophobic character…
Ammonium pentaborate (APB) is shown to be an effective intumescent, char- forming additive for thermoplastic polyurethanes (TPU). As little as 5 to 10 parts of APB, added to a flame retarded TPU, provides a 7 to 10-fold improve ment in burn-through resistance. The APB/TPU char is characterized by its glassy, multicell…
The ionic conductivities in glass and glass‐ceramics were studied for Na 3.2 M 0.7 Si 2.9 P 0.1 O 8.7 ( M = Er , Y , Ho , Dy , Gd , Eu , and Sm ) compounds. The results showed comparable conductivity values, in the range of 10 −4 (Ω‐cm) −1 at 280°C, with the glasses being somewhat better conductors. Compounds of the t…