Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 enriched end groups of isotactic polypropylene and poly(1-butene) prepared in the presence of ethylenediindenyldimethyltitanium and methylalumoxanePasquale Longo, Alfonso Grassi, Claudio Pellecchia, and Adolfo ZambelliCite this: Macromolecules 1987, 20, 5, 1015–101…
Abstract A modified centrifugation technique for obtaining soil solutions was developed and compared to immiscible displacement technique using different immiscible liquids. Coefficients of variation and standard deviations for ionic composition of soil solutions obtained by the modified centrifugation method were con…
This book discusses the following topics: Solution synthesis of ceramic powders; vapor and solid state synthesis of ceramic powders; ceramic powder dispersions; consolidation of ceramic powders; and powder and pore structure characterization.
Abstract Extensive areas of soils in northern New York have formed in parent materials deposited in late Quaternary water bodies. In previous studies, distinctions among these lacustrine, marine, and brackish‐water deposits have relied on the identification of fossils and continuous shoreline features; however, eviden…
Abstract The complex with the composition ranging from 6:4 to 2:8 of ethyl α-cyano-4-[2-(4-pyridyl)ethenyl]cinnamate (1) and propyl α-cyano-4-[2-(4-pyridyl)ethenyl]cinnamate (2) photodimerized quantitatively into the three types of tricyclic dimer crystal, indicating a disordered sequence of 1 and 2 in the monomer cry…
The complexes [Mn ( mac )Cl2]+ [ mac = 1,4,8,1l-tetraazacyclotetradecane (cyclam), meso and rac -5,7,7,12,14,14-hexamethylcyclam ( teta and tet b respectively)] have been prepared. The trans-[ Mn ( tet a )Cl2] Cl.3H2O complex crystallizes in the monoclinic space group P21 /c, Z 2, a 8.4006(8), b 12.465(2), c 11 .659(2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic characterization of carbon monoxide bonding sites on supported small rhodium clustersG. Apai and B. G. FrederickCite this: Langmuir 1987, 3, 3, 395–400Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Publishe…
Abstract Experimental results on reactions forming polyurethanes and polyurethane‐polyester Interpenetrating polymer network (IPN) are discussed with particular interest in rheological and kinetic changes before the gel point. In the IPN formation, viscosity rise is affected by the amount of styrene and polyester in t…
Circular disc-crack-like defects randomly distributed on {111} planes have been discovered by 300kV transmission electron microscopy in diamond that had crystallized on non-faceted growth surfaces of mean orientation {100}. In a sample of ∼ 100 defects, disc diameters were narrowly distributed about a mean of 1·2 μm a…
The resistivity anomaly near 170 K in alpha -YH(D)x solid solutions due to the ordering of hydrogen into a paired configuration is analysed in detail. Defects are introduced into the ordered structure by a quench from room temperature and by electron irradiation at 20 K (Ee-=0.35 to 0.8 MeV) resulting in residual resi…
Dissolution of glass coupons with the general composition χNa 2 O.(100–χ)[0.33B 2 O 3 ·0.67SiO 2 ], with χ varying from 3 to 11, has been monitored with and without prior phase separation of the glasses. A major reduction in dissolution rates was noted upon phase separation of glasses with χ≃ 3. This was correlated wi…
Abstract Composition of soil solutions in contact with fragipan and nonfragipan horizons of Fragiudalfs in western Kentucky were related to the composition of soil amorphous constituents removed by various extractants. Increased amorphous Si/Al ratios in fragipan horizons were correlated well with reduced pH 4 SiO 4 s…
Among the vinyl monomers, acrylonitrile is the only monomer used for the production of synthetic fibers. Other vinyl monomers lack cohesive forces between the molecular chains of their polymers and, hence, can not compete with acrylonitrile [1]. Acrylic fiber has replaced wool in many major applications, particularly…
The metastable chiral smectic C phases of the compounds have been made technically useful by alloying to different two- and three-component systems with enantiotropic behaviour. These systems can serve as a base for multi-component systems of higher order for optimizing various properties. In a similar way, the inconv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtection and polymerization of functional monomers. 10. Synthesis of well-defined poly(4-vinylbenzaldehyde) by the anionic living polymerization of N-[(4-ethenylphenyl)methylene]cyclohexamineAkira Hirao and Seiichi NakahamaCite this: Macromolecules 1987, 20, 12, 2968–2972P…
Oxycarbide glasses in the Mg‐Al‐Si‐O‐C system and oxynitride glasses in the Mg‐Al‐Si‐O‐N system were synthesized by conventional melting techniques, chemically analyzed, and evaluated for selected mechanical properties as a function of carbon or nitrogen content. Both glass systems exhibited increases in density, Youn…
Abstract The combustion activities of various oxide catalysts were investigated using BaO·6Al2O3 as support. Conventional impregnation of oxide catalysts only lead to a decrease in surface area of the support. Cation-substituted barium hexaaluminates generally retained the large surface area. In particular, BaMnAl11O1…
Important cellular characteristics, including selective adhesion, growth rate, motility, and differentiation, are controlled, in part, by signals received at the cell surface. The molecular mechanisms for the cell surface control of these cell behaviors are largely unknown. In order to probe the role of specific extra…
Abstract Diffraction patterns of oriented blends of isotactic polypropylene (iPP) and polyethylene (PE) published recently by several authors are analyzed on the basis of a unique epitaxial relationship between the iPP and PE crystal lattices. The contact planes are (100) PE and (010) iPP , and the PE chains lie at 50…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and crystal structures of (Te2Se8)(AsF6)2, (Te4.5Se5.5)(AsF6)2, and (Te2Se6)(Te2Se8)(AsF6)4(SO2)2Michael J. Collins, Ronald J. Gillespie, and Jeffery F. SawyerCite this: Inorg. Chem. 1987, 26, 10, 1476–1481Publication Date (Print):May 1, 1987Publication History P…