Materials Literature
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Abstract Dimethylsilanediol and other water-soluble dimethysiloxanols undergo aqueous photolytic oxidative demethylation with tropospheric ultraviolet radiation in the presence of suitable chromophores, such as nitrogen oxides, to give silicic acid and carbon dioxide. The “biosuitability” of the resulting silicic acid…
A crystal chemical study carried out on phosphate single crystals with the formula AIBIIPO4 (AI=Na, K; BII=Ca, Zn, Sr, Cd, Ba, Pb) has permitted to follow the evolution of the crystal symmetry inside these series. Second harmonic generation (SHG) tests held on powder or small single crystals and hysteresis loops displ…
Abstract The solid reaction products from pyrolysis of polyethylene terephthalate in the presence and absence of red phosphorus were characterized by CP/MAS 13 C‐NMR, FR‐IR, and MAS 31 P‐NMR spectroscopy. Over the temperature range of 300–400°C, polyethylene terephthalate was converted in a sealed vial to a highly cro…
Abstract From analysis of infrared spectra it was found that in syndiotactic ( s ) poly(methyl methacrylate) (PMMA) in solution, long s sequences contain an increased population of diads with a skeletal conformation tt (in the staggered approximation). Self‐aggregation of s ‐PMMA in solution leads to a further increas…
The review of the experimental investigations of the anomalous (bulk) photovoltaic effect in the crystals without a center of symmetry is presented. The linear and circular effects for piezo and ferroelectrics are investigated in the wide range of conditions (the extrinsic and intrinsic absorbtion, different impurity…
Abstract The isothermal melting behavior of poly( L ‐lactic acid) spherulites has been studied in order to understand the mechanism of melting using hot‐stage microscopy. When the periphery of the spherulite melts or shrinks, the central portion undergoes thickening as a result of which the melting or shrinking rate i…
The temperature dependence of the soft mode components in BaTiO3 and KNbO3 and their contribution to the low-frequency dielectric constant are reexamined under the 1ight of recent hyper-Paman and infrared reflectivity data. Correlated fluctuations are less and less dominant with the decrease of critical dimensionality…
Abstract Morphological studies of isotactic polypropylene/low‐density polyethlene blends revealed that the shape, size, and orientation of LDPE occlusions remain undisturbed during the crystallization of IPP spherulites. On the other hand, LDPE occlusions introduce large changes in the internal structure of IPP spheru…
Study of melt rheological properties of the blends of polypropylene (PP) with styrene–ethylene butylene–styrene block copolymer (SEBS), at blending ratios 5–20% SEBS, is reported. Results illustrate the effects of (i) blend composition and (ii) shear rate or shear stress on melt viscosity and melt elasticity and the e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-metal atom cluster compound containing silver(I) and platinum(II)Rafael Uson, Juan Fornies, Milagros Tomas, F. Albert Cotton, and Larry R. FalvelloCite this: J. Am. Chem. Soc. 1984, 106, 8, 2482–2483Publication Date (Print):April 1, 1984Publication History Published on…
The optical constants of polycrystalline electrochromic (EC) tungsten trioxide films, prepared by rf sputtering, were measured by ellipsometry at three wavelengths: 940, 633, and 546 nm. For each wavelength, the optical constants were measured at various states of coloration. It is shown that these measurements provid…
The Escherichia coli pyrC, pyrD and pyrF genes were cloned on multicopy plasmids derived from pBR322 and analysed by means of restriction endonucleases. It was found that the pyrC gene is destroyed by cutting with the restriction endonuclease BamHI, that the entire pyrD gene can be isolated on a 1300-base pairs DNA fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-encased vesiclesSteven L. Regen, Jae Sup Shin, and Kazuo YamaguchiCite this: J. Am. Chem. Soc. 1984, 106, 8, 2446–2447Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pubs.acs.org/doi/10.1021/ja…
A new failure mechanism resulting in open metal bit- lines was observed during reliability testing of vendor 64k dynamic random access memory (RAIM) products using sputtered Al-Si metallurgy. Life test data, physical failure analysis, and metal film characterization are presented, The observed phenomenan is not strict…
Processing characteristics, anistropic swelling, and mechanical properties of short-jute-fiber-and short-glass-fiber-reinforced styrene–butadiene rubber (SBR) composites have been studied both in the presence and absence of carbon black. Tensile and tear fracture surfaces of the composites have been studied using scan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface analysis: x-ray photoelectron spectroscopy, Auger electron spectroscopy and secondary ion mass spectrometryNoel H. Turner, Brett I. Dunlap, and Richard J. ColtonCite this: Anal. Chem. 1984, 56, 5, 373–416Publication Date (Print):April 1, 1984Publication History Publi…
Stabilization of positive charge in fluorinated ethylene propylene copolymer (Teflon FEP) is demonstrated using corona charging through a controlling grid at elevated temperatures. The extrapolated lifetime of the equivalent surface potential is 800 yr for samples charged at 150 °C and deteriorates for lower charging…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of metallocene cyclophosphazene derivativesHarry R. Allcock, Karen D. Lavin, Geoffrey H. Riding, Paul R. Suszko, and Robert R. WhittleCite this: J. Am. Chem. Soc. 1984, 106, 8, 2337–2347Publication Date (Print):April 1, 1984Publication History Publish…
Optically transparent dielectric films, when prepared by thermal evaporation or sputtering, have had limited use for many applications due to their permeability and lack of stability. We report on protective dielectric films produced by ion-beam-assisted deposition which demonstrate significant improvements over films…
Thin films (∼1 μm) of boron nitride were grown on water-cooled glass, silicon, and sapphire substrates by reactive sputter deposition from a BN target in Ar, Ar/N2, and N2 discharges. The effect of sputtering gas composition on film chemical and optical behavior is reported and discussed in the present paper. The foll…