Materials Literature
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Abstract Repeated ion exchange of the ZSM-5 zeolite using aqueous copper(II) acetate solution was found to bring about excess loading of copper ions above 100% of exchange level. The catalytic activities of the resulting Cu-ZSM-5 zeolites for direct decomposition of nitrogen monoxide were very high and increased with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttenuation lengths of photoelectrons in hydrocarbon filmsColin D. Bain and George M. WhitesidesCite this: J. Phys. Chem. 1989, 93, 4, 1670–1673Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pub…
In situ spectroelectrochemical studies have been carried out on polyaniline films formed on a reflective platinum disk electrode in acidic media by means of near‐normal incidence reflectance spectroelectrochemical techniques. The results indicate that there are four optically different species depending on the potenti…
THE unique properties of diamond are yet to be tapped for a large number of advanced materials applications. Fascination with this king of all gemstones
Measurements of viscoelastic properties near the sol-gel transition demonstrate that viscoelastic phenomena are described by power laws. To describe these phenomena, we derive the distribution of relaxation times for branched polymers, both in the reaction bath and in the dilute solution. From this spectrum we can com…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet-singlet and triplet-triplet intramolecular transfer processes in a covalently linked porphyrin-phthalocyanine heterodimerT. H. Tran Thi, C. Desforge, C. Thiec, and S. GaspardCite this: J. Phys. Chem. 1989, 93, 4, 1226–1233Publication Date (Print):February 1, 1989Publ…
C 32 H 26 N 2 O 6 cristallise dans P1 avec affinement jusqu'a 0,078. C 36 H 34 N 2 O 6 cristallise dans P1 avec affinement jusqu'a 0,107. C 40 H 26 N 2 O 6 cristallise dans P1 avec affinement jusqu'a 0,070. C 48 H 26 N 6 O 4 cristallise dans P1 avec affinement jusqu'a 0,046
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of polydispersity in the end-grafted polymer brushS. T. Milner, T. A. Witten, and M. E. CatesCite this: Macromolecules 1989, 22, 2, 853–861Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline and thermal properties of bacterial copolyesters: poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate)Masao Kunioka, Akira Tamaki, and Yoshiharu DoiCite this: Macromolecules 1989, 22, 2, 694–697Publication Date (Print):Feb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrophosphito-bridged diplatinum chemistryD. Max Roundhill, Harry B. Gray, and Chi Ming CheCite this: Acc. Chem. Res. 1989, 22, 2, 55–61Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pubs.acs.or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the synthesis of ortho-substituted tetraphenylporphyrinsJonathan S. Lindsey and Richard W. WagnerCite this: J. Org. Chem. 1989, 54, 4, 828–836Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February…
Recent work has rendered possible the formulation of a rigorous model for the propagation of pressure waves in bubbly liquids. The derivation of this model is reviewed heuristically, and the predictions for the small-amplitude case are compared with the data sets of several investigators. The data concern the phase sp…
Abstract Graft copolymerization of methacrylic acid (MetAc) onto potato starch using H 2 O 2 /Fe ++ redox system was investigated. The best conditions of the grafting reaction were determined and several variables were studied: initiator and monomer concentrations, time, and temperature. Percent grafting efficiency, p…
Abstract The electrosynthesis of polyparaphenylene films (PPP) by oxidation of benzene or biphenyl on a Pt electrode was studied in different organic media. Film formation was possible only if the solvent had acidic properties according to the Lewis concept, and if the water content of this medium was less than 5 × 10…
Abstract Copolyamides of nylon‐4,6 and nylon‐4,T were prepared by a two‐step method: (1) a prepolymerization in an autoclave (40 min at 210°C) and (2) a postcondensation in the solid state (4 h, 260°C). On these materials was studied the melting behavior with DSC, the crystalline structure with WAXS, the water absorpt…
Abstract When PVC films containing zinc(II) chloride were heated in the temperature range 65–95°C, broad absorptions developed in the 250–900 nm region with maxima around 610 nm. The development of the color, the rate of which was proportional to the ZnCl 2 content, was preceded by an induction period, the length of w…
Abstract Polyamides containing arylene sulfone ether linkages were synthesized from 4,4′‐[sulfonylbis( p ‐phenyleneoxy)] dibenzoyl chloride (SPCI), 3,3′‐[sulfonylbis( p ‐phenyleneoxy)] dibenzoyl chloride (SMCl), and arylene sulfone ether diamines (SED), by solution and interfacial polymerization techniques. In solutio…
Filament-assisted chemical vapor deposition (CVD) diamond film growth on Si(100) was studied using x-ray photoelectron spectroscopy (XPS) to examine the sample at selected intervals during the nucleation and growth processes. The sample was transferred under vacuum from the growth chamber to the attached XPS analysis…
Abstract A detailed study has been made of the thermal cure of two polyimides using infrared analysis. It is shown that two of the IR bands commonly used to determine the amount of imidization are affected by both interference from other species and by polymer morphology. These bands, located near 1780 cm −1 and 730 c…
Magnetic properties of the series of ThMn 12 -structure intermetallic compounds R(Fe 11 Ti) have been determined for rare earths from Nd to Lu plus Y. The highest Curie temperature (607 K) is for R=Gd, and R-Fe exchange interactions are much stronger for light rare earths than for heavy ones. The temperature dependenc…