Materials Literature
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Abstract The thermal dissociation of urethane groups has been studied by FTIR spectroscopy depending on the type of diisocyanate, the structure of the hard segment and the composition of polyurethane. Independent of the composition and the structure, the dissociation started between 150 and 160°C. Consequently, the di…
Abstract The hydrolysis of 2-(2-trichlorosilylethyl)pyridine (TCSEP) or 3-aminopropyltrimethoxysilane (APTMS) yields a complex mixture of oligomers, the composition of which is a function of time. 29 Si NMR measurements show that the same oligosilsesquioxanes can be obtained from both compounds after prolonged hydroly…
We have measured the adiabatic elastic constants of two Cu-Al-Ni martensitic alloys using ultrasonic methods and we have compared the results to recent neutron-scattering experiments. It is shown that the elastic behavior of Cu-Al-Ni alloys follows the same trends exhibited by other Cu-based alloys; in particular, the…
The microstructure and Cu distribution were determined for blanket and patterned Al(≤4 wt % Cu) thin films as a function of annealing. The growth of Θ-phase (Al2Cu) precipitates in blanket and patterned submicrometer-wide lines was quantified along with the Cu concentrations within the Al grains. The reliability of 0.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyanines of a Novel Structure: Dinaphthotetraazaporphyrins with D2h SymmetryNagao Kobayashi, Tohru Ashida, Tetsuo Osa, and Hideo KonamiCite this: Inorg. Chem. 1994, 33, 9, 1735–1740Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Pub…
P. A. Scolnik, G. E. Bartley; Nucleotide Sequence of an Arabidopsis cDNA for Geranylgeranyl Pyrophosphate Synthase, Plant Physiology, Volume 104, Issue 4,
V2O5 gels produced by sol-gel methods have several potential uses in electronics and catalysis, but the rate and mechanism of the synthesis remain poorly understood. Recent results disagree with models previously proposed. 51V NMR spectra show that the initial reactions involve the consumption of the dioxovanadium cat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-Valent Nickel Thiaporphyrins. Nuclear Magnetic Resonance and Electron Paramagnetic Resonance StudiesPiotr J. Chmielewski, Lechoslaw Latos-Grazynski, and Ewa PacholskaCite this: Inorg. Chem. 1994, 33, 9, 1992–1999Publication Date (Print):April 1, 1994Publication History P…
The ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Ru}}_{15}$ icosahedral alloy was studied by $^{27}\mathrm{Al}$ nuclear magnetic resonance from 150 to 1110 K. The Knight shift of the unresolved resonance line was observed to significantly increase above 500 K. This uncommon temperature dependence of the Knight sh…
A recently developed recombinant system for synthesis of human procollagen II by stably transfected host cells was used to prepare adequate amounts of protein to study the self-assembly of collagen II into fibrils. The procollagen II was cleaved to pCcollagen II by procollagen N-proteinase (EC 3.4.24.14), the pCcollag…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation and Reactivity of (Octaethyltetraazaporphyrinato)rhodium ComplexesYaping Ni, Jeffrey P. Fitzgerald, Patrick Carroll, and Bradford B. WaylandCite this: Inorg. Chem. 1994, 33, 9, 2029–2035Publication Date (Print):April 1, 1994Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Polyamides with Large Second-Order Nonlinear Optical PropertiesChristoph Weder, Peter Neuenschwander, Ulrich W. Suter, Philippe Pretre, Philip Kaatz, and Peter GuenterCite this: Macromolecules 1994, 27, 8, 2181–2186Publication Date (Print):April 1, 1994Publication Histor…
Structures of tripotassium tetrasodium dihydrogen decatungstolanthanoate crystals, K 3 Na 4 H 2 [LnW 10 O 36 ].nH 2 O (Ln=Pr, Nd, Dy; n=21-22), have been determined and compared with the structures of their isomorphous crystals with Ln=Sm, Gd and Tb. All six [LnW 10 O 36 ] 9- anions in these isomorphous crystals exhib…
Abstract The title complexes in the compositions 2Ag(CN)·Cd(CN)2·3(4-Mepy) and 3Ag(CN)·Cd(CN)2·4(4-Mepy) crystallize from the same mother solution with the supramolecular structures remarkably different from each other. The former is a clathrate accommodating a guest 4-Mepy in the interwoven double network host. The l…
Stability of hollow fiber drawing is studied, based on the quasi-one-dimensional equations of thin film dynamics. It is shown that the model isothermal drawing process is unstable when the draw ratio E (that of output to input velocities) exceeds the critical value E*=20.22 when the viscosity force is dominating. Unde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Studies of Thermoplastic Triblock Copolymer GelsN. Mischenko, K. Reynders, K. Mortensen, R. Scherrenberg, F. Fontaine, R. Graulus, and H. ReynaersCite this: Macromolecules 1994, 27, 8, 2345–2347Publication Date (Print):April 1, 1994Publication History Published on…
To better understand the reasons for the hyper-accumulation of polyhydroxyalkanoate (PHA) in mutant Azotobacter vinelandii UWD, the kinetic properties of 3-ketothiolase, acetoacetyl-CoA reductase, and β-hydroxybutyrate dehydrogenase were examined. The regulation of the condensation of acetyl-CoA mediated by 3-ketothio…
Creep and creep rupture behavior of an advanced silicon nitride ceramic were systematically characterized in the temperature range 1150° to 1300°C using uniaxial tensile creep tests. Absence of tertiary creep and the order‐of‐magnitude breaks in both creep rate and rupture lifetime at certain threshold combinations of…
Abstract UV spectrophotometry of a Hammett indicator revealed that the acid strength of the Keggin-type heteropolyacids having W as addenda atoms increased as the valency of the central atom increased (Co < B < Si, Ge < P). The catalytic activity for the decomposition of isobutyl propionate in a h…
We determine the phase diagram of a quasi-one-dimensional superconductor (weakly coupled chains system with an open Fermi surface) in a magentic field. A field H(0,H,0) along the y direction (perpendicular the direction x of highest conductivity) tends to confine the electronic motion in the z direction. At low temper…