Materials Literature
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Abstract The thermal oxidation of some hydrecarbon polymers differing by their degree of branching was studied simultaneously by chemiluminescence and infrared spectrophotometry. In the case of isotactic polypropylene, measurements were made at various temperatures ranging from 140 to 180°C. The other polymers—ethylen…
Abstract Poly(lactide) with narrow molecular weight distribution was obtained by the ring-opening polymerization of D-lactide with (5,10,15,20-tetraphenylporphinato)aluminum alkoxide as initiator. The polymerization was demonstrated to proceed via the ring-opening of lactide at the acyl-oxygen bond to give (porphinato…
In animals, perfluorochemicals (PFCs) are effective ultrasound (US) contrast agents that produce hepatic, splenic, and tumor enhancement. The use of Fluosol-DA 20%, an emulsion of perfluorodecalin and perfluorotripropylamine, was studied in nine non-critically ill patients with cancer who had liver lesions. US studies…
Abstract The solubility of a series of para ‐linked, substituted phenyl, biphenyl, terphenyl, and quaterphenyl polyamides is reported. Most of these polymers are soluble in amide solvents without lithium chloride, and several are soluble in ethers and/or ketones. The results indicate that solubility in this class of p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational variability of corrins. Some methods of analysisVirginia B. Pett, Michael N. Liebman, Peter Murray-Rust, Kamla Prasad, and Jenny P. GluskerCite this: J. Am. Chem. Soc. 1987, 109, 11, 3207–3215Publication Date (Print):May 1, 1987Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of low-spin ferric porphyrins: a single-crystal EPR and structural investigation of the influence of axial ligand orientation and the effects of pseudo-Jahn-Teller distortionRobert Quinn, Joan Selverstone Valentine, Marianne P. Byrn, and Charles E. Strou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of transesterification in poly(ethylene terephthalate) by small-angle neutron scatteringJ. Kugler, J. W. Gilmer, D. Wiswe, H. G. Zachmann, K. Hahn, and E. W. FischerCite this: Macromolecules 1987, 20, 5, 1116–1119Publication Date (Print):May 1, 1987Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear susceptibilities of finite conjugated organic polymersDavid N. Beratan, Jose Nelson. Onuchic, and Joseph W. PerryCite this: J. Phys. Chem. 1987, 91, 11, 2696–2698Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 M…
An overview of the method of surface differential reflectivity (SDR) for the study of semiconductor surfaces is presented. This includes the principles of the technique, the experimental apparatus, and some theoretical considerations concerning the connection of SDR data with the microscopic properties of the surface.…
Abstract— The photosensitized oxidation of L‐tryptophan by gallium phthalocyanines sulfonated to different degrees is studied as a function of both substrate and sensitizer concentrations in water and 50% MeOH‐H 2 O solutions. The maximum quantum yield of singlet oxygen was found to be nearly 0.5 for all sulfonated ga…
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…