Shear-induced orientation transitions in triblock copolymer styrene-butadiene-styrene with cylindrical domain morphology
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Thermal Shrinkage Of Oriented Polymers
One of the important aims of modern polymer research is to achieve an understanding of molecular chain conformation and of the spatial arrangement of the polymer molecules in the solid state. In attempts to solve this problem and to interpret the physical properties of high polymers, it is necessary to remember that a…
Collapse-stretching transition for polymer brushes: preferential solvation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCollapse-stretching transition for polymer brushes: preferential solvationP. Auroy and L. AuvrayCite this: Macromolecules 1992, 25, 16, 4134–4141Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pubs.a…
Variations of bond lengths and volumes of silicate tetrahedra with temperature
AesrRAcr The apparent SiO bond lengths recorded for silicates over a range oftemperatures either typically are invariant or exhibit a contraction with increasing temperature. A rigid-body thermal analysis was completed for the tetrahedra in nine silicates whose structures have been determined over a range of temperatu…
Synthesis, Structure, and Properties of Poly(4-Methyl-1 -Pentene)
Poly(4-methyl-l-pentene) (PMP) is a linear α-polyolefin with isobutylbranches and with very interesting properties. From a practical point of view. PMP presents high optical transparency. relatively high thermal stability and chemical resistance. in addition to excellent dielectric characteristics and microwave transp…
Sodium chloride and soil texture interactions in irrigated field grown sultana grapevines. II. Plant mineral content, growth and physiology
Effects of salinity on the mineral composition, growth and physiology of field-grown sultana grapevines were studied by adding NaCl solution to River Murray water. Five salt treatments, ranging between 0.37 and 3.47 dS m-l, were applied for six seasons. Petiole levels of Cl and Na were better predictors of yield than…
The effect of cellulose degradation on the strength of wood pulp fibres
The relationship between fibre strength loss and cellulose degree of polymerization (D.P.) was examined for different pulps and chemical treatments in an effort to understand the cause of fibre strength loss a high -cellulose contents. Is was found that the decrease in fibre strength is caused by the degradation of ce…
Facial amphiphiles
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFacial amphiphilesYuan Cheng, Douglas M. Ho, Craig R. Gottlieb, Daniel Kahne, and Michael A. BruckCite this: J. Am. Chem. Soc. 1992, 114, 18, 7319–7320Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://…
Crystal Chemistry and Atomic Order in Brucite-related Double-layer Structures
Brucite-related double layer structures are characterized by a regular but distinct stacking of [Me2x+Me3+ (OH)2x+2]+ octahedral layers with ordered cation distribution and usually x = 2 or x = 3, alternating with anionic {A·nH2O}- interlayers. The stacking sequence of the layers is rhombohedral (3R) or hexagonal (2H)…
Glycogen and poly- -hydroxybutyrate synthesis in Spirulina maxima
The effect of different growth conditions on the glycogen and poly-β-hydroxybutyrate (PHB) content of the cyanobacterium Spirulina maxima is described. Under photoautotrophic growth conditions without any nutrient limitation, S. maxima exhibited a glycogen content of between 7.1 and 10.7% of cell dry wt, whereas PHB w…
Sintering and Characterization of Polycrystalline Monoclinic, Tetragonal, and Cubic Zirconia
Polycrystalline monoclinic ( m ), tetragonal ( t ), and cubic ( c ) ZrO 2 , sintered at 1500°C, were annealed in the cubic stability field and rapidly cooled to permit the displacive c → t ′ transformation to occur in compositions containing 0–6 mol% Y 2 O 3 . The bulk fracture toughness of coarse‐grained (> 25 μm)…
Combined DeSOx/DeNOx reactions on a copper on alumina sorbent-catalyst. 1. Mechanism of sulfur dioxide oxidation-adsorption
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCombined DeSOx/DeNOx reactions on a copper on alumina sorbent-catalyst. 1. Mechanism of sulfur dioxide oxidation-adsorptionGabriele Centi, Nello Passarini, Siglinda Perathoner, and Alfredo RivaCite this: Ind. Eng. Chem. Res. 1992, 31, 8, 1947–1955Publication Date (Print):Aug…
Arrested solid-solid phase transition in 4-nm-diameter cadmium sulfide nanocrystals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArrested solid-solid phase transition in 4-nm-diameter cadmium sulfide nanocrystalsM. Haase and A. P. AlivisatosCite this: J. Phys. Chem. 1992, 96, 16, 6756–6762Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 19…
Sea urchin collagen evolutionarily homologous to vertebrate pro-alpha 2(I) collagen.
We isolated several overlapping cDNA clones covering the 4242 nucleotides of a Strongylocentrotus purpuratus transcript that codes for a fibrillar procollagen chain. The sea urchin polypeptide includes a 124-amino acid long amino pre-propeptide, a 1064-amino acid alpha-chain inclusive of 338 uninterrupted Gly-X-Y repe…
Liquid crystalline epoxy thermosets based on dihydroxymethylstilbene: Synthesis and characterization
Abstract This article describes the synthesis and characterization of a new series of liquid crystalline thermosets. Nematic epoxy‐terminated oligoethers based on dihydroxy‐α‐methylstilbene were synthesized for this study. These prepolymers were crosslinked within the nematic mesophase using methylenedianiline. Depend…
Gadolinium-Ethoxybenzyl-DTPA, a New Liver-Specific Magnetic Resonance Contrast Agent: Kinetic and Enhancement Patterns in Normal and Cholestatic Rats
OBJECTIVES: Gadolinium-ethoxybenzyl-DTPA (Gd-EOB-DTPA) is a new hepatobiliary magnetic resonance imaging (MRI) contrast agent with a dual elimination: 70% via the liver and bile and 30% via the kidney in normal rats. The abdominal enhancement patterns of this new compound and the uptake mechanism by the liver were stu…
Sulfidation of zinc titanate and zinc oxide solids
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSulfidation of zinc titanate and zinc oxide solidsSusan Lew, Adel F. Sarofim, and Maria Flytzani-StephanopoulosCite this: Ind. Eng. Chem. Res. 1992, 31, 8, 1890–1899Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 Augus…
Lattice Constants of Boron Carbides
The lattice constants of boron carbides have been determined by powder X‐ray diffraction for samples with compositions between about 7.7 and 20.5 at.% carbon. The boundaries of the single‐phase region are at about 9 at.% carbon and near, but likely somewhat less than, 20 at.% carbon. The composition dependence of the…
Preparation of MgAl 2 O 4 Spinel Powders via Freeze‐Drying of Alkoxide Precursors
High‐sinterability MgAl 2 O 4 powder has been produced from alkoxide precursors via a freeze‐drying method. Clear alumina sol and magnesium methoxide were used as starting materials in the process. The spinel powders were characterized by various techniques, such as thermal analysis, X‐ray diffraction, scanning electr…
Quantitative structure-property relationships for aqueous solubilities and Henry's law constants of polychlorinated biphenyls
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative structure-property relationships for aqueous solubilities and Henry's law constants of polychlorinated biphenylsFrank M. Dunnivant, Alan W. Elzerman, Peter C. Jurs, and Mohamed N. HasanCite this: Environ. Sci. Technol. 1992, 26, 8, 1567–1573Publication Date (Pri…