Materials Literature
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The ceric ion method has been used to graft acrylic acid directly onto cellulose with a minimum amount of homopolymer. The method utilizes the pretreatment of the cellulose with ceric ammonium nitrate followed by washing out any excess of the catalyst. Oxygen can be present with the pretreatment step, but must be excl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermolysis rates and products of the putative ketochloroallyl groups in poly(vinyl chloride), as inferred from the behavior of analogous model compoundsMary G. Panek, Gilberto M. Villacorta, and William H. Starnes Jr.Cite this: Macromolecules 1985, 18, 5, 1040–1041Publicati…
Abstract A method is proposed for the measurement of cation‐exchange capacity (CEC) of leached soils carrying both variable and constant negative charges at conditions pertinent to the field. The method consists of equilibrating a soil with 0.01 M SrCl 2 (five centrifuge washings), replacing the retained Sr with 0.5 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of the first 20-Bi-9 system: a discrete nine-coordinate 20-electron bismuthConstantine A. Stewart, Joseph C. Calabrese, and Anthony J. Arduengo IIICite this: J. Am. Chem. Soc. 1985, 107, 11, 3397–3398Publication Date (Print):May 1, 1985Publication His…
A pulse electr-optical technique is described which allows the molecular tilt angle and optical anisotropy of ferroelectric liquid crystals to be measured. The technique provides high accuracy and reproducibility of the measurement and is insensitive to the non-homogeneity of a liquid crystalline layer. The temperatur…
The probability formulas given in Parts I and II of this series have been improved by incorporating the information contained in Sim's distribution. Possible applications to the discrimination of the phase ambiguities arising from the single isomorphous replacement technique, the one-wavelength anomalous scattering (O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-spin .tautm. low-spin transition in solid Co(H2fsa2en)(H2O)2[H4fsa2en = N,N'-ethylenebis(3-carboxysalicylaldimine)]: a magnetic investigationJacqueline Zarembowitch, Renee Claude, and Olivier KahnCite this: Inorg. Chem. 1985, 24, 10, 1576–1580Publication Date (Print):Ma…
A new complete scheme of symmetry analysis for incommensurate modulated structures is applied for the first time to the important ceramic material mullite ${\mathrm{Al}}_{2}$(${\mathrm{Al}}_{2+2\mathrm{x}}$${\mathrm{Si}}_{2\mathrm{\ensuremath{-}}2\mathrm{x}}$)O $_{10\mathrm{\ensuremath{-}}x}\ensuremath{\square}_{x}$.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of the voltammetric response of thin electroactive polymer filmsJames Q. Chambers and Gyorgy. InzeltCite this: Anal. Chem. 1985, 57, 6, 1117–1121Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue 1 May 1…
Abstract The influence of the N ‐alkyl group of tertiary hindered amines on the photostabilization of polymers was studied. The photostabilizing effects of the tertiary amine derivatives of 4‐benzoyloxy‐2,2,6,6‐tetramethylpiperidine ( 1a ) in polypropylene were compared. All tertiary amine derivatives having α‐H to hi…
Abstract The formation of liquid‐crystalline structure in hydroxypropyl cellulose (HPC) in the solvent 2‐hydroxyethyl methacrylate (HEMA) is described. In addition, an attempt is made to preserve the ordered structure of HPC in a composite by polymerizing the solvent. Optical evidence, including refractive index, abso…
Using an adiabatic scanning calorimeter we have studied the thermal behavior of the liquid crystalline material heptyloxybenzylidene-heptylaniline in the temperature range between 52°C and 86°C. In this temperature range a rich variety of liquid crystalline and plastic crystalline phases and phase transitions could be…
Abstract A morphological study of hydroxypropyl cellulose (HPC) was performed on solid films prepared by casting from a liquid‐crystalline aqueous solution at rest or under shear. Electron microscopic observations reveal that many round particles composed of stacked disks are densely packed in the interior of a quiesc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of binary blends of narrow molecular weight distribution polystyrenes. 2Hiroshi Watanabe, Takashi Sakamoto, and Tadao KotakaCite this: Macromolecules 1985, 18, 5, 1008–1015Publication Date (Print):May 1, 1985Publication History Published online1 May 2…
The ground state of the Si2C molecule is found to be a closed-shell C2v symmetry structure with unusually short Si–C bonds. In these theoretical studies a double zeta plus polarization (DZ+P) basis set was used initially. At the self-consistent-field (SCF) level of theory the DZ+P C2v symmetry structure collapses to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe generation and trapping of the high-temperature oxosilyliumyl cation radicals (28SiO+ and 29SiO+) in neon matrixes at 4 K; an ESR and ab initio CI theoretical investigationLon B. Knight Jr., A. Ligon, R. W. Woodward, David Feller, and E. R. DavidsonCite this: J. Am. Chem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet and triplet potential surfaces for the nickel-ethylene [Ni(C2H4)] complex. A CASSCF-CI studyPer Olof Widmark, Bjoern O. Roos, and Per E. M. SiegbahnCite this: J. Phys. Chem. 1985, 89, 11, 2180–2186Publication Date (Print):May 1, 1985Publication History Published onli…
Abstract Numerous copolymerizations of glycolide with β‐propiolactone, γ‐butyrolactone or δ‐valerolactone were conducted either in bulk or in nitrobenzene solution at temperatures in the range of 20 to 150°C. Three classes of catalysts were used, namely acidic catalysts initiating cationic polymerizations, complexing…
Studies of the kinetics of crystallization were performed on polyethylene-naphthalene-2,6-dicarboxylate (PEN) and onits copolyester with p-hydroxybenzoic acid (PHB). It is shown that PEN crystallizes in two different crystal modifications. The copolyester forms a lattice which corresponds to one of the two crystal mod…
We have found a cII-dependent promoter, PaQ, within the Q gene of bacteriophage lambda. Transcription experiments and abortive initiation assays performed in vitro showed that the promoter strength and the cII affinity of PaQ were comparable to the other cII-dependent lambda promoters, PE and PI. The location and left…