Materials Literature
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Abstract Die β‐Modifikation eines auf spezielle Weise pigmentierten und stabilisierten Polypropylen‐Typs wurde durch einen nicht isotherm geführten Kristallisationsprozeß in reiner Form dargestellt. Das Schmelzverhalten der β‐Modifikation ist stark von der thermischen Vorgeschichte — vor allem von der Rückkühltemperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent-induced crystallization of quenched isotactic polypropylene in different liquidsV. Vittoria and F. RivaCite this: Macromolecules 1986, 19, 7, 1975–1979Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-phase block copolymer synthesis by the iniferter techniqueTakayuki Otsu, Tetsuo Ogawa, and Tsuyoshi YamamotoCite this: Macromolecules 1986, 19, 7, 2087–2089Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986h…
An energy-selective photon detector for inverse photoemission spectroscopy is described. The bandpass is effected by the transmission cut-off of a CaF2 window and the ionisation threshold of an acetone filling. The detected mean photon energy is E0=9.9 eV with an energy resolution Delta E=0.4 eV (FWHM). With this dete…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation and photophysical properties of iron-ruthenium tetranuclear bipyridyl complexes of the type {[(bpy)2Ru(L-L)]3Fe}R. H. Schmehl, R. A. Auerbach, W. F. Wacholtz, C. M. Elliott, R. A. Freitag, and J. W. MerkertCite this: Inorg. Chem. 1986, 25, 14, 2440–2445Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of weakly solvated lanthanide-metal cations. Synthesis, characterization, and catalytic chemistry of [Eu(CH3CN)3(BF4)3]xRichard R. Thomas, Venkatasuryanarayana. Chebolu, and Ayusman. SenCite this: J. Am. Chem. Soc. 1986, 108, 14, 4096–4103Publication Date (Print):J…
Different expressions of the maximum-entropy estimates of the electron density function, corresponding to different prior information are obtained. They show that no general-purpose configurational entropy of density maps exists. Some universal properties of the modellings are discussed. In particular, the meaning of…
Abstract We have combined pressure–volume–temperature measurements and high‐temperature x‐ray diffraction to calculate the heat of fusion of the poly(4‐methyl pentene‐1) crystal from the Clapeyron equation. We find Δ H f = 14.8 cal/g, only about half as large as several literature values. The new value of the heat of…
Abstract The kinetic reaction of ferron (8‐hydroxy‐7‐iodo‐5‐quinoline‐sulfonic acid) with partially neutralized Al solutions of varying basicity and age were investigated with the intent of separating mononuclear and polynuclear Al. Ferron solutions buffered with varying quantities of NaOAc, NH 2 OH·HCl, and acetic ac…
Abstract Studies conducted on butadiene–acrylonitrile copolymer (NBR)/poly(vinyl chloride) (PVC) blends at different temperatures indicate that an optimum temperature exists for the formation of a particular blend. The mechanical properties of the blends confirm this observation. PVC stabilizer based on magnesium oxid…
10 GHz electron paramagnetic resonance studies of Fe3+ in synthetic brown α-quartz single crystals have been carried out at 295 and at 40 K. The spin-Hamiltonian parameters were determined including high-spin Zeeman terms of form BS3 and allowing (g,D) matrix noncoaxiality as well as nonuniaxial anisotropy of the g ma…
The effects of ZrO 2 additions on the mechanical properties of four commercial aluminas have been studied, and the changes in intergranular and intragranular ZrO 2 particle sizes during aging have been determined for one of the aluminas. In this ceramic, the intercranular and intragranular ZrO 2 particles coarsen obey…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetry control of the coloring problem: the electronic structure of MB2C2 (M = calcium, lanthanum, ...)Jeremy K. Burdett, Enric. Canadell, and Timothy. HughbanksCite this: J. Am. Chem. Soc. 1986, 108, 14, 3971–3976Publication Date (Print):July 1, 1986Publication History Pu…
Abstract Chemical diffusion coefficients have been derived from experiments on the point defect relaxation in magnetite. Based on data from preceding studies on the nonstoichiometry of magnetite and on the iron tracer diffusion of this oxide, the chemical diffusion coefficients are analyzed with regard to elementary d…
Power Samples of Three Alkylthio Substituted Triphenylenes have been Investigated by X-ray diffraction. All have a hexagonal columnar Dhd phase. In one compound, a phase transition Dho Dhd is found, in which the hexagonal lattice of columns remains unaffected by the order-disorder transition within the columns.
The surface analysis technique of x-ray photoelectron spectroscopy (XPS) has been used to investigate the chemical composition and reactivity of the wool epicuticle. Approximate relative proportions of protein and lipid material in the epicuticle have been deduced from the surface elemental ratios; the sulfur content…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution crystallization of poly(ether ether ketone)Andrew J. Lovinger and D. D. DavisCite this: Macromolecules 1986, 19, 7, 1861–1867Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986https://pubs.acs.org/doi/10.1…
The three dimensional shape effect of asperity on abrasive wear was investigated with in-situ experiments in the scanning electron microscope. The geometry of model asperity was represented by attack angle and dihedral angle, where attack angle changed in 0∼90 deg and dihedral angle in 0∼180 deg. Wear modes of shearin…
The synthesis and characterization of pyrazine-bridged polymers of iron(II/III), ruthenium(II/III), and osmium(II/III) octaethylporphyrin (dubbed "shish-kebab" polymers) are presented. Optical and dc conductivity measurements reveal that the ruthenium and osmium polymers, when partially oxidized, are highly conductive…
Experimental evidence indicating immiscibility of the homopolymers poly(vinylidene fluoride) and poly(vinyl fluoride), both in the crystalline and amorphous phases, is presented. The X-ray analysis of the blended samples reveals patterns that are relatively insensitive to blend composition and that are similar to thos…