Materials Literature
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Ultrasonic (70 W, 20 kHz) solution (2%) degradations of poly(alkyl methacrylates) have been carried out in toluene at 27°C and in tetrahydrofuran (THF) at -20°C. Mw and Mn of all polymers (before and after sonification) were computed from GPC. Irrespective of the alkyl substituent, Mw decreased rapidly at first and th…
A new modelling method for magnetic circuits is presented. The method can be used to model magnetic circuits with any number of windings. The models incorporate adequate information about the correct distribution of leakage energy, the presence of gaps throughout the core, the arrangement of the windings, and the type…
Mechanisms of the reversible photodarkening phenomenon have been studied for amorphous S and Se. These materials exhibit smaller photodarkening effects when illuminated with sub-bandgap illumination at 80 K. A configurational model is proposed for interpreting the results, and parameters characterizing the model are e…
Available mmpositional data for l27t samples of natural tetrahedrite and 295 of synthetic tetrahedrite were s1amingd. They show: compositional ranges of four to ten Cu, zero to six Ag, and a total of two (Fe, Zn, Hg) atoms, complete substitution (up to four atems) amongAs, Sb and Te, and a total of 13 atoms of S per f…
Boron nitride films have been deposited by a metal organic chemical vapor deposition (MO‐CVD). The reaction between ammonia and triethylboron is carried out in the temperature range of 750°–1200°C with the molar ratio of . Colorless and transparent films are obtained at temperatures of 950°–1100°C with the molar ratio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman studies of metal tetrakis(4-N-methylpyridyl)porphine: band assignments, structure-sensitive bands, and species equilibriaNils Blom, Junichi Odo, Kazuo Nakamoto, and Dennis P. StrommenCite this: J. Phys. Chem. 1986, 90, 13, 2847–2852Publication Date (Print):Ju…
Abstract Morphology, crystallinity, and melting behaviour of solution‐cast films of poly(ethylene oxide) (PEO)/poly(methyl methacrylate) (PMMA) blends were investigated as a function of composition, using optical and scanning electron microscopy, differential scanning calorimetry, and dilatometry. Up to a content of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of enthalpy relaxation in poly(methyl methacrylate): effects of tacticity, deuteration, and thermal historyJohn J. Tribone, J. M. O'Reilly, and Jehuda GreenerCite this: Macromolecules 1986, 19, 6, 1732–1739Publication Date (Print):June 1, 1986Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeuteration effects on the miscibility and phase separation kinetics of polymer blendsHsinjin Yang, Mitsuhiro Shibayama, Richard S. Stein, Nobuyuki Shimizu, and Takeji HashimotoCite this: Macromolecules 1986, 19, 6, 1667–1674Publication Date (Print):June 1, 1986Publication H…
The aim of any diffraction experiment is to obtain reproducible data of high accuracy and precision so that the data can be correctly interpreted and analyzed. Various methods of sample preparation have been devised so that reproducibility, precision and accuracy can be obtained. The success of a diffraction experimen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology control of binary polymer mixtures by spinodal decomposition and crystallization. 1. Principle of method and preliminary results on PP/EPRNobuyuki Inaba, Kazuo Sato, Shyunichi Suzuki, and Takeji HashimotoCite this: Macromolecules 1986, 19, 6, 1690–1695Publication…
CELLULOSE STRUCTURE AND BIOSYNTHESIS: Natural Celluloses Recent X-Ray Crystallographic Studies of Celluloses Structure of Cellulose - Solvent Complexes Pea Cellulose and Xyloglucan: Biosynthesis and Biodegradation The Primary Cell Wall: A New Model Structure, Swelling and Bonding of Cellulose Fibers Cellulose Carbamat…
Abstract New mechanism of cationic polymerization of cyclic ethers and acetals consisting in the activated (e.g. protonated) monomer addition to the electrically neutral macromolecule e.g.: magnified image is discussed. It is shown, that when the ‐OH in the tail‐group is more nucleophilic than monomer itself this mech…
Abstract The processing, structure and properties of polyetheretherketone (PEEK) semicrystalline thermoplastic as matrix polymer for high performance composites has been investigated in this work. In processing PEEK samples with different crystallinities, a specially designed mold capable of cooling the polymer in exc…
. Raman spectra are reported for powdered crystalline anorthite, sanidine, leucite, a-nepheIme, an~ ~-carnegie~te ~nd glasses .ofCaA12Si20s (An), KAlSi30s (Or), and NaAlSiO. (Ne) composItIOns. Quahtatlve compansons between features in the spectra of the isochemical c~stal~ a~d glasses indicate that the glasses maintai…
Etude de l'influence des procedures de reduction de donnees, des modeles de facteur de temperature et des modeles de deformation sur les resultats
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisubstituted tungstosilicates. 1. Synthesis, stability, and structure of the lacunary precursor polyanion of a tungstosilicate .gamma.-SiW10O368-Jacqueline Canny, Andre Teze, Rene Thouvenot, and Gilbert HerveCite this: Inorg. Chem. 1986, 25, 13, 2114–2119Publication Date (P…
A Landau-Ginzburg approach to an interface with finite thickness incorporates surface tension, anisotropy, curvature, and dynamics of the interface along with supercooling. Various aspects are rigorous.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyhedral oligometallasilsesquioxanes (POMSS) as models for silica-supported transition-metal catalysts. Synthesis and characterization of (C5Me5)Zr[(Si7O12)(c-C6H11)7]Frank J. FeherCite this: J. Am. Chem. Soc. 1986, 108, 13, 3850–3852Publication Date (Print):June 1, 1986Pu…
The crystal structure of synthetic BeO, bromellite, has been determined at several pressures to 5.0 GPa and several temperatures to 1183 K. The single variable atomic-positional parameter, z of oxygen, does not vary significantly with pressure, but does undergo a small increase with temperature. The hexagonal axial ra…