Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance study of norbornene end-capped polyimides. 1. Polymerization of N-phenylnadimideA. C. Wong and W. M. RitcheyCite this: Macromolecules 1981, 14, 3, 825–831Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published in…
Mesomorphic derivatives of 2-substituted 5-p-alkyl(alkoxy or cyano)phenylpyridines, 1,4-disubstituted piperidines, and ethyl 5-p-alkylphenylthiophene-2-carboxylates have been synthesised and their liquid crystal properties compared with those of analogous benzene and cyclohexane derivatives. Intermediates in the pyrid…
A large number of laterally fluorinated 4-n-alkyl- and -alkoxy-phenyl 4'-n-alkyl- and -alkoxy-benzoates and 4-n-alkylphenyl trans-4'-n-alkyl- and -alkoxy-cyclohexane-1-carboxylates were synthesised. In these compounds, the lateral fluoro-substituent was situated in either the phenol or the carboxylic acid moiety of th…
The optical properties of Kapton type H polyimide film, obtained from reflectance measurements, are presented for photon energies from 0.5 to 70 eV. Equations for the energy-loss function, with parameters fixed by the optical data, are employed to calculate mean free paths and stopping powers for low-energy electrons…
The optical transmission spectrum of a discontinuous metal-island film is strongly affected by extremely thin layers (<1 monolayer) of dye adsorbate. Experimentally observed splitting and broadening of the plasma resonance of silver films with adsorbed rhodamine B and nile blue dyes can be described by an effective-me…
Molecular absorption is shown to be substantially enhanced near rough metallic and dielectric surfaces. The conditions under which this may lead to enhanced photochemical processes are investigated.(AIP)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOsmotic deswelling of gels by polymer solutionsJ. Bastide, S. Candau, and L. LeiblerCite this: Macromolecules 1981, 14, 3, 719–726Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published inissue 1 May 1981https://pubs.acs.org/doi/10.1021/ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of interfacial phenomena in the behavior of alumina-supported palladium crystallites in oxygenJames J. Chen and Eli RuckensteinCite this: J. Phys. Chem. 1981, 85, 11, 1606–1612Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published in…
An approximation scheme is derived to calculate the velocity-autocorrelation function for the Lorentz model of overlapping hard discs and hard spheres. The theory describes a feedback between the particle-density correlations and the current relaxation rate, and is shown to give a percolation edge, a transition from t…
Electron spin resonance (ESR) and infrared absorption (IR) experiments have provided information about the role of aluminum in the radiation response of commercially available high-quality synthetic quartz. Samples obtained from two separate sources were investigated, and identical radiation responses were found for t…
Abstract The effect of saturated aliphatic fatty acids and a number of fluorinated polar organic compounds on the release of polyurethane foam from cold rolled steel has been investigated. Little release was observed with aliphatic acids of less than 10 carbons or with the organic compounds. Release behavior increased…
Immiscibility temperatures of Na 2 O‐B 2 O 3 ‐SiO glasses, with andwithout 1 mol% MoO 3 , additions, were determined and the effect of MoO 3 additions on the 65O°C immiscibility isotherms was established. In addition, immiscibility temperature and phase‐separation morphology of an Na 2 O‐B 2 O 3 ‐SiO 2 glass with prog…
Abstract A lime‐potassium factorial experiment (four K and seven lime treatments) was established on a Coastal Plain soil in 1970. Wide ranges in soil pH and percent Ca, Mg, and K saturation were obtained. Results indicate that the use of the Basic Cation Saturation Ratio Concept for making fertilizer recommendations…
Abstract Injection‐molded tensile bars of unstabilized polypropylene were oven aged at 90°C. After an induction period, tensile elongation decreased catastrophically. During the induction period no evidence of oxidation was observed by infrared reflectance; however, a definite surface etching was noted by electron mic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular mechanics calculations and experimental studies of conformations of .delta.-valerolactoneThomas Philip, Robert L. Cook, Thomas B. Malloy Jr., Norman L. Allinger, Scott Chang, and Young YuhCite this: J. Am. Chem. Soc. 1981, 103, 9, 2151–2156Publication Date (Print):…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Surface energies of solids can be estimated using contact angles of liquids of known surface tension and susceptibilities for polar or acid-base interactions. Interfacial tensions and work of adhesion can be calculated using these estimated energies. There are three circumstances in which performance or bond strengths…
Abstract The thermal decomposition of sodium nitrate and the effects of several oxides, such as silica, titania, zirconia, alumina, and magnesia, on the decomposition were studied up to 900 °C by means of the thermal analysis, gas analysis, and chemical analysis of the reaction products. The reaction of sodium nitrate…
Abstract X-Ray photoelectron spectroscopy was used to reveal the surface states of MgO, CaO, and BaO oxides, which are catalytically active for ethylene hydrogenation. The catalytic activity of CaO exposed to H2O changed with an increase in the temperature of evacuation in a way similar to that of Ca(OH)2 decomposed b…
The history of polyolefins actually began in the 1890s with the synthesis of polymethylene from diazomethane. In the 1930s researchers in England discovered that ethylene at high pressure and in the presence of oxygen polymerized to a high molecular weight resin. Further research there and in the United States at stil…