Materials Literature
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Abstract The key to preparation of commercially useful blends based on immiscible polymer pairs is compatibilization. Advances over the past ten years have considerably enhanced the understanding of this phenomenon. The selection of an appropriate compatibilizer and the processing technique to enhance the compatibiliz…
Perfluorooctylbromide (PFOB: C8F17Br) has been shown to be an effective ultrasound contrast agent when incorporated in tissues. The authors have recently demonstrated that PFOB also enhances tissues and Doppler signals during its capillary phase. To help elucidate the physical basis of their observations, the authors…
Abstract As part of a broader research effort to prepare polyolefin blends with controlled rheological and mechanical behavior, LDPE/PP blends were peroxide modified through reactive processing in intensive batch mixers. Polymers with similar initial viscosities and elasticities were first melt mixed and then simultan…
Abstract Spherulite growth rates in thin films of isotactic polypropylene, poly (methylene oxide), and poly (ethylene adipate) have been studied by light microscopy. The growth rate of the parts of spherulites formed from pockets of occluded melt is decreased drastically. The decrease is associated with the negative p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrigin and consequences of the nonnuclear attractor in the ab initio electron density functions of dilithiumRainer. Glaser, Roy F. Waldron, and Kenneth B. WibergCite this: J. Phys. Chem. 1990, 94, 19, 7357–7362Publication Date (Print):September 1, 1990Publication History Pub…
The microstructure and chemistry of grain‐boundary phases in silicate‐doped Y 2 O 3 ─ZrO 2 ceramics were evaluated by analytical electron microscopy. Two different silicate compositions were used: one an aluminosilicate and the other a borosilicate glass. These grain‐boundary phases had a significant impact on the gra…
Chemithermomechanical pulp (CTMP) of aspen was used as a filler in high density (HDPE) and linear low density (LLDPE) polyethylenes. To improve the bonding between the fiber and polymer, different chemical treatments of the fiber a) treatment with different isocyanates b) coating with maleic anhydride was carried out.…
Mutants of Salmonella typhimurium defective in the proteins of the fructose operon [fruB(MH)KA], the fructose repressor (fruR), the energy-coupling enzymes of the phosphoenolpyruvate:sugar phosphotransferase system (PTS) (ptsH and ptsI), and the proteins of cyclic AMP action (cya and crp) were analyzed for their effec…
We have used chiral compounds with very high helical twisting power as components in induced-cholesteric mixtures in order to obtain new blue phase systems. In one of these mixtures an unusual large blue phase temperature range of more than 10 K was observed. The lattice constant of the BPI in this system increases st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of quenched disorder on phase transitions in the mixed-valence solid solution [FeIII2FeII1-xCoIIxO(O2CCH3)6(py)3](py)Ho G. Jang, Kazutoshi Kaji, Michio Sorai, Richard J. Wittebort, Steven J. Geib, Arnold L. Rheingold, and David N. HendricksonCite this: Inorg. Chem. 19…
A mullite precursor sol was prepared by mixing boehmite and silica sols. On addition of 3.5 wt% F − ion as a 47% solution of HF, the mullite sol was gelled. The dried gel was ball‐milled and calcined at 1400°C for 1 h in an airtight container. Mullite whiskers grew on the (111) plane along the 〈001〉 direction.
We explain the deep electrical conductivity minimum near x=0.05 in the perovskite-type ceramic ${\mathrm{LaCr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Mn}}_{\mathit{x}}$${\mathrm{O}}_{3}$ as a crossover between two different regimes of hopping conduction. At low Mn concentrations the diffusion of small polaron…
3-O-Methyl-D-glucose (methylglucose) is often used to study blood-brain barrier transport and the distribution spaces of hexoses in brain. A critical requirement of this application is that it not be chemically converted in the tissues. Recent reports of phosphorylation of methylglucose by yeast and heart hexokinase h…
A cDNA clone of silkworm (Bombyx mori) larval hemolymph antitrypsin (sw-AT) has been isolated from a fat body cDNA library. The cDNA has an open reading frame which codes a 392-amino acid residue polypeptide comprising a 16-residue signal peptide and a 376-residue mature sw-AT of Mr 41,805. The reactive site of sw-AT…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe tetranuclear trianion [Fe4Te4(SC6H5)4]3-: crystal and molecular structure and magnetic propertiesPierluigi Barbaro, Alessandro Bencini, Ivano Bertini, Fabrizio Briganti, and Stefano MidolliniCite this: J. Am. Chem. Soc. 1990, 112, 20, 7238–7246Publication Date (Print):Se…
A new spectrometer design is presented in which the angular dispersion with respect to wave number is nearly constant. The spectrometer is a type of grism, a series combination of grating and prism, in which the constant parts of the dispersion terms add to one another but the slopes of the dispersions tend to cancel…
Abstract The preparation of green rusts from sulphate solutions and representative Mössbauer spectra are described. As the samples oxidized readily, attention focused on the Mössbauer parameters at liquid nitrogen and helium temperatures. The spectra recorded at 77 K could be fitted satisfactorily with one ferrous iro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetochemistry of the tetrahaloferrate(III) ions. 1. Crystal structure and magnetic ordering in bis[4-chloropyridinium tetrachloroferrate(III)]-4-chloropyridinium chloride and bis[4-bromopyridinium) tetrachloroferrate(III)]-4-bromopyridinium chlorideJalal A. Zora, K. R. Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction study of the electronic ground state of (meso-tetraphenylporphinato)iron(II)Naiyin Li, Zhengwei Su, Philip Coppens, and John LandrumCite this: J. Am. Chem. Soc. 1990, 112, 20, 7294–7298Publication Date (Print):September 1, 1990Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the anionic polymerization of phenylvinylsulfoxide and its copolymer with styreneRustom S. Kanga, Thieo E. Hogen-Esch, E. Randrianalimanana, A. Soum, and M. FontanilleCite this: Macromolecules 1990, 23, 19, 4235–4240Publication Date (Print):September 1, 1990Public…