Materials Literature
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A series of aromatic polyesters based on either poly(chloro-p-phenylene terephthalate) or poly(methyl-p-phenylene terephthalate) modified by incorporation of various amounts of bisphenols of different structures were prepared and their thermotropic liquid crystal properties were studied by several methods including: (…
Abstract Molecular aggregation in a commercial polyimide film, Du Pont Kapton, was investigated by small‐angle x‐ray scattering (SAXS). From the analysis of the desmeared SAXS curve, it is concluded that aggregation in the Kapton film can be elucidated in terms of a two‐phase structure having electron density fluctuat…
Abstract The ultimate mechanical properties ( σ B and ε B ) and elastic recovery (inversely measured by tension set) of dynamically vulcanized melt mixed rubber-plastic blends increase with the similarity of the rubber and plastic in respect to the critical surface tension for melting γ c . They also increase with the…
The cation distribution in stoichiometric Fe 3 O 4 was determined from thermopower measurements at 600° to 1500°C. The distribution varies from inverse at low temperature to random at ∼1450°C. The equilibrium constant for cation distribution can be expressed as In K CD =2770/ T −1.61, indicating temperature‐independen…
Plasma protein adsorption is an important initial event in the response of tissue to foreign materials. Little is known about the way in which the chemical properties of materials influence the nature of the adsorbed layer and thus the later cellular responses. In this study, the amounts of fibrinogen, immunoglobulin…
Multiple scattering of acoustic waves by random distribution of discrete scatterers is treated within the framework of quantum mechanical potential scattering with the use of an acoustic potential operator. The effective field approximation (EFA) and quasicrystalline approximation (QCA) are imposed on the multiple sca…
Abstract Model compounds have been used to determine the mechanism of the reaction of aromatic diamines with aromatic cyclic dianhydrides to form poly(amic acids). Phthalic anhydride was used to model the anhydride functionality, while either 4,4′‐diaminodiphenyl ether or aniline was used for the amine functionality.…
Deuterium (D) and He were ion-implanted into Fe, and the D depth distribution was monitored during linear ramping of temperature. Defects associated with He, possibly small bubbles, were observed to trap the D with an enthalpy of 0.75±0.07 eV. The previously air-exposed Fe surface was a substantial permeation barrier…
Abstract A method for the determination of residual stresses in plastic pipe by layer removal and subsequent slitting is described. Results are analyzed from deflections measured on a high density polyethylene pipe. The use of these data in the calculation of K I around a semi‐elliptical flaw at the pipe wall is then…
Abstract Thermal expansion and anisotropic thermal vibrations are investigated for pure tin, indium, and their intermetallic compounds : In 3 Sn and InSn 4 , below and above room temperature. Measurements are performed with spherically shaped single crystals. The dependences of the lattice parameters on temperature ar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThioether ligation in iron-porphyrin complexes: models for cytochrome cToshio Mashiko, Christopher A. Reed, Kenneth J. Haller, Margaret E. Kastner, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1981, 103, 19, 5758–5767Publication Date (Print):September 1, 1981Publication…
Abstract The stability of untreated and heat‐treated Co and FeT(p‐OCH 3 )PP/Norit BRX (T(p‐OCH 3 )PP = meso‐tetra(p‐methoxy)phenylporphyrin) has been studied under a variety of conditions: in pure electrolyte (6N H 2 SO 4 ), in the presence of H 2 O 2 , and under a current load (O 2 reduction); all at various temperat…
Transition properties of some compounds of the type, n-C n H2n+1N+(CH3)3X-, with n = 10, 12, 14, 18, 22, and X = Cl, Br, and I, were investigated. All these compounds show a solid-solid phase transition with a large enthalpy change in the range of temperature 350 ∼ 400K. The transition behaviors were investigated by t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of isocyanate-based polymers. 1. Kinetics of the thermal dissociation of urethane, oxazolidone, and isocyanurate groupsP. I. Kordomenos and J. E. KrestaCite this: Macromolecules 1981, 14, 5, 1434–1437Publication Date (Print):September 1, 1981Publication His…
Cross-linking with glutaraldehyde with subsequent NaDodSO4-polyacrylamide gel electrophoresis has been introduced as a convenient method for studying the association of oligomeric proteins [Hermann, R., Rudolph, R., & Jaenicke, R. (1979) Nature (London) 277, 243-245]. In the present paper, an improved version of this…
In this paper we report the purification of a protein which is able to catalyze both the proline oxidase and the pyrroline-5-carboxylic acid dehydrogenase activities necessary for the oxidation of proline to glutamic acid. The purification involves the preparation of a crude membrane pellet, detergent solubilization,…
We have observed charge-density-wave (CDW) phase transitions in the cubic spinel structure Cu${\mathrm{V}}_{2}$${\mathrm{S}}_{4}$. At 90 K a CDW forms with a reduced wave vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}=(\frac{1}{4}\ensuremath{-}\ensuremath{\delta})[110]$. The incommensurability $\ensuremath{\d…
Abstract Proportions of the component layers in randomly interstratified illite-smectites can be determined precisely in the presence of discrete illite if two reflections (at 15–16 and 31–32°2 θ Cu K α ) are strong enough to be measured accurately. The method takes into account the variable thickness of the smectite-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic behavior of automotive catalysts. 1. Catalyst oxidation and reductionRichard K. HerzCite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 3, 451–457Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published inissue 1 September 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of a complex with a carbide bridge between two iron atoms from the reaction of (tetraphenylporphyrin)iron(II) with carbon tetraiodideDaniel Mansuy, Jean Pierre Lecomte, Jean Claude Chottard, and Jean Francois BartoliCite this: Inorg. Chem. 1981, 20, 9, 3119–3121Pub…