Materials Literature
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Transient currents induced by the polarity reversal of a dc voltage applied to a liquid-crystal cell have been experimentally studied. For voltages less than a characteristic value, the time occurrence of the peak current decreases with decreasing applied voltage, which is contrary to behavior expected for a normal ca…
Abstract Polymerization of epichlorohydrin (ECH) in the presence of diols, catalyzed by Lewis or protic acids, proceeds by activated monomer mechanism (AMM), i.e., by subsequent additions of protonated monomer molecules to the terminal hydroxyl groups of the growing chain. As opposed to the typical active chain end me…
Low kinetic energy particle bombardment of a growing film surface has been employed to grow high‐quality copper thin films on silicon and with ideal metal/substrate interface characteristics. It is shown that the energy of Ar ions concurrently bombarding a growing film surface determines the crystal structure of the f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegment density distribution of symmetric diblock copolymers at the interface between two homopolymers as revealed by neutron reflectivityThomas P. Russell, Spiros H. Anastasiadis, Alain Menelle, Gian P. Felcher, and S. K. SatijaCite this: Macromolecules 1991, 24, 7, 1575–15…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh oxygen-evolving activity of rigidly linked manganese(III) porphyrin dimers. A functional model of manganese catalaseYosinori Naruta and Kazuhiro MaruyamaCite this: J. Am. Chem. Soc. 1991, 113, 9, 3595–3596Publication Date (Print):April 1, 1991Publication History Publish…
An indirect method to determine the oxygen dissolved in AIN is devised for AIN(Y 2 O 3 ) ceramics and then related to thermal conductivity. Dissolved oxygen is determined by first constructing the AIN‐rich corner of the AIN—Y 2 O 3 —Al 2 O 3 phase diagram (isothermal section). This is achieved by (1) measuring the tot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of novel quasiaromatic zinc-sulfur aggregates and related zinc-oxygen complexesMarilyn M. Olmstead, Philip P. Power, and Steven C. ShonerCite this: J. Am. Chem. Soc. 1991, 113, 9, 3379–3385Publication Date (Print):April 1, 1991Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric organosilicon systems. 10. Synthesis and conducting properties of poly[2,5-(disilanylene)thienylenes]Joji Ohshita, Daisuke Kanaya, Mitsuo Ishikawa, Tsuneaki Koike, and Toru YamanakaCite this: Macromolecules 1991, 24, 8, 2106–2107Publication Date (Print):April 1, 19…
Abstract In the presence of a catalytic amount of a nickel(II) complex coordinated with 1,3-diketone, various cyclic or acyclic ketones are converted into the corresponding lactones or esters by the Baeyer–Villiger oxidation on treatment with an atmospheric pressure of molecular oxygen (oxidant) and an aldehyde (reduc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrastructure of poly(p-phenylenebenzobisoxazole) fibersDavid C. Martin and Edwin L. ThomasCite this: Macromolecules 1991, 24, 9, 2450–2460Publication Date (Print):April 29, 1991Publication History Published online1 May 2002Published inissue 29 April 1991https://pubs.acs.or…
Abstract Five different analytical schemes for examining isothermal and nonisothermal degradation of polymers were reviewed and found inadequate for describing multistage decomposition. The different schemes were experimentally tested using thermogravimetric analysis data for an ethylene‐vinyl acetate (EVA) copolymer,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of cocrystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by solid-state high-resolution carbon-13 NMR spectroscopy and differential scanning calorimetryNaoko Kamiya, Minoru Sakurai, Yoshio Inoue, Riichiro Chujo, and Yoshiharu DoiCite this: Macromolecules 19…
The preparation and solid-state characterization of the 1,3-phenylene-bridged bis(dithiadiazolyl) and bis(diselenadiazolyl) diradicals 1,3-[(E2N2C)C6H4(CN2E2)] (E = S, Se) are reported. The isomorphous crystals of 1,3-[(E2N2C)C6H4(CN2E2)] so obtained are tetragonal, space group I41/a. Stacks of diradical molecules, li…
A comprehensive account is presented of the state-of-the-art in filament-winding methods for high performance aerospace structural components employing advanced wet and prepreg resins and continuous-filament reinforcements. Component configurations producible by these means encompass cylindrical, spherical, and flat c…
We have looked for evidence of a correlation length in a molecular-dynamics simulation of the glass transition. We have studied the correlation functions of both the translational order of particle positions and the orientational order of nearest-neighbor bond angles, and have seen no indication of a diverging length…
Switching of the direction of polarization in ferroelectric thin films can be used as a mechanism for space-efficient memory storage in microcircuits. The fields required for adequate switching rates are of the order of 5 × 105 volts/cm. At these high fields, there are several potential mechanisms for the motion of ch…
Abstract Mutual precipitates of poly ( N, N ‐dimethyl acrylamide) and poly (4‐hydroxystyrene) were collected from dioxane, methanol, or acetone. The glass transition ( T g ) temperatures of the precipitates are higher than the weight‐average values. Clear films cast from dimethylformamide solutions have lower T g valu…
Lattice energy minimization and lattice dynamics calculations for the minerals andalusite, sillimanite, kyanite, diopside, cordierite, gehlenite, leucite, orthozoisite, grossular, and pyrope are compared with experimental data and previous calculations. The potential models used in this study included bond-bending int…
In a long-term outdoor test with high direct and alternating voltages, silicone and ethylene propylene diene monomer (EPDM) rubber composite insulators have, at the beginning, shown a performance superior to that of glass and porcelain insulators. In the long-term test, however, the silicone rubber composite insulator…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of vanadium-containing silsesquioxanesFrank J. Feher and John F. WalzerCite this: Inorg. Chem. 1991, 30, 8, 1689–1694Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pubs.…