Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransverse optical to longitudinal optical splitting and dipole moment derivatives from infrared spectra of thin films of molecular solidsLlewellyn H. Jones and Basil I. SwansonCite this: J. Phys. Chem. 1991, 95, 7, 2701–2707Publication Date (Print):April 1, 1991Publication…
Abstract Polyaddition of phosphoric acid to diepoxides, studied mostly with diepoxybutane (2) , provides either soluble or insoluble (gels) polymers, depending on polyadditions conditions. Gels swell in water and slowly hydrolyze to soluble linear/branched polymers. These soluble polymers, prepared either directly or…
The study of microstructure in the rigid-rod aramid poly(p-phenyleneterephthalamide) (PPTA) is augmented through the correlation of experimentally determined X-ray diffraction patterns with results from an atomistic model designed to simulate pseudocrystalline polymeric materials. Aspects of fiber spinning and X-ray a…
Abstract The pitting potential U p is an important characteristic of every pitting system. It separates the region of passivity where the metal is practically immune from the region of heavy localized corrosion attack. On the basis of our own experimental results on pitting corrosion in the aluminum/halide‐system, the…
Abstract The cationic polymerization of 3,3‐bis(azidomethyl)oxetane (BAMO) was compared with the polymerization of 3,3‐bis(chloromethyl)oxetane (BCMO). The initiating system, boron trifluoride diethyl etherate/diethylene glycol (system. name: 2,2′‐oxydiethanol) was used and it was shown that unusually high concentrati…
A systematic experimental and theoretical study of first-order grating coupling to surface plasma waves existing at an air–Ag interface is presented. The experiment extends beyond previous work to grating depths comparable with the grating period. The grating profiles range from sinusoidal to rectangular. For TM-polar…
The durability of three ceramic waste forms containing Zr as a constituent is examined at 90° and 150°C in HCl or deionized water. The three ceramic waste forms examined are: (A) 10‐mol%‐Y 2 O 3 ‐stabilized ZrO 2 , (B) La 2 Zr 2 O 7 with a pyrochlore structure, and (C) CaZrO 3 with a perovskite structure. Each form co…
Discusses reduction of thread strength as a cause of loading in sewing. Investigates measurements of dynamic loads of the thread during seam formation and reduction of thread strength after loading in sewing. Analysis of results shows that the reduction in thread strength after loading in sewing is a function of dynam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequence distribution and its effect on glass transition temperatures of poly(anhydride-co-imides) containing asymmetric monomersAndrea Staubli, Edith Mathiowitz, and Robert LangerCite this: Macromolecules 1991, 24, 9, 2291–2298Publication Date (Print):April 29, 1991Publicat…
Complete active space multiconfiguration self-consistent field followed by higher-order configuration interaction calculations reveal that the ground state of Au6 is of 1A1 symmetry with a capped pentagonal structure. Similar calculations on Au−6 are also made. The 1A1g state of the neutral Au6 with a ring structure (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, characterization, and reactivity of manganese and rhenium dioxime complexes. X-ray crystal structure of MnII(CDO)(CDOH)2(BPh(OCH3))2, an unusual pseudoclathrochelate complex, and ReIIICl(CDO)(CDOH)2BPhS. Jurisson, L. Francesconi, K. E. Linder, E. Treher, M. F. Mal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic oxides: preparation and properties of the tetrahedral (Td) chromium cubane [(.eta.-C5(CH3)5)Cr(.mu.3-O)]4 and comparison with the D2 [(.eta.-C5H5)Cr(.mu.3-O)]4 and D2d [(.eta.-C5H4CH3)Cr(.mu.3-O)]4Frank Bottomley, Jinhua Chen, Sarajane M. MacIntosh, and Robert…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of adsorbed 2-vinylpyridine/styrene diblock copolymers on silver surfaces using surface-enhanced Raman scatteringW. H. Tsai, F. J. Boerio, S. J. Clarson, E. E. Parsonage, and M. TirrellCite this: Macromolecules 1991, 24, 9, 2538–2545Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-Alkylation and Hofmann elimination from thermal decomposition of R4N+ salts of aromatic polyamide polyanions: synthesis and stereochemistry of N-alkylated aromatic polyamidesRobert R. Burch and Lewis E. ManringCite this: Macromolecules 1991, 24, 8, 1731–1735Publication Dat…
Intergranular corrosion in copper bicrystals with symmetrical [110] tilt boundaries and in Cu-9 at.% Al alloy bicrystals with symmetrical [110] and [100] tilt boundaries was investigated by examining the depths of corrosion grooves developed at the boundaries after an immersion test in acid solutions (modified Livings…
A new method of pulse sharpening is described in which the risetime of a high-voltage pulse is progressively reduced as it propagates along a uniform lumped-element delay line containing nonlinear ferroelectric capacitors. The capacitors are made from a barium-titanate-based ceramic dielectric whose relative permittiv…
The R ‐curve behavior of hot‐pressed silicon nitride reinforced with silicon carbide whiskers is investigated from room temperature to 1300°C using the chevron‐notch bend test. The bridging stress, estimated from increment of fracture resistance in the rising R ‐curve, is discussed in relation to tensile strength meas…
The active site of dienelactone hydrolase (DLH), a microbial enzyme of the beta-ketoadipate pathway, has been conclusively located using a combination of crystallographic, biochemical, and genetic techniques. DLH hydrolyzes a dienelactone to maleylacetate and has esterase activity on p-nitrophenyl acetate and trans-ci…
Abstract Magnetic susceptibility and ESR studies on high-spin (S=3⁄2) tetrahedral cobalt(II)–thiolate complexes were performed for A2[Co(SPh)4]; A=Me4N (1a), Et4N (1b), Ph4P (1c) and (Et4N)2[Co(SR)4]; R=C6H4-p-Me (2), C6H4-p-Cl (3), C6F5 (4). It was found that the magnitude of zero-field splitting and the anisotropy o…
Demonstration de la possibilite d'observer une difference dans les courbes f'(E) pour deux etats d'oxydation differents d'un element dans un compose de valence mixte, a proximite d'un seuil d'absorption approprie. Cette methode a l'avantage de fournir des informations, en etant selective sur le site