Materials Literature
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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.…
An atomic model of defects on {113} in Si has been derived experimentally from high-resolution electron micrographs. A simulated image of the proposed model agrees well with experiment. The model is constructed by two kinds of structural units. One is incorporated by self interstitial atoms to form tiny rods of the he…
Our aim in this paper is to present a rather general non-linear continuum theory that may prove useful for the interpretation of observations and experiments upon smectic C liquid crystals. In its present formulation our theory is constrained to exclude variations in the layer spacing thickness and also changes in til…
The electronic state of ferromagnetic Ni and the expected magnetic circular dichroism (MCD) in Ni 2p\ensuremath{\rightarrow}3d x-ray-absorption spectroscopy [2p (XAS)] are discussed from a viewpoint of 3d configuration interaction on the basis of the Anderson impurity model. The model includes multiplet effects arisin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCritical molecular weight for block copolymer reinforcement of interfaces in a two-phase polymer blendCostantino Creton, Edward J. Kramer, and Georges HadziioannouCite this: Macromolecules 1991, 24, 8, 1846–1853Publication Date (Print):April 1, 1991Publication History Publis…
We previously reported that acetaldehyde increases the production of type I collagen in cultured rat fat-storing cells. We studied the regulation of this effect by determining the expression of procollagen type I, fibronectin and transforming growth factor-beta 1 messenger RNAs in passage 1 and 2 cultures of fat-stori…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and heat of solution of potassium dihydrogen citrateThomas V. Van AukenCite this: J. Chem. Eng. Data 1991, 36, 2, 255–257Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pubs.acs.org/doi/10.1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of novel poly(ether ketones) containing the o-dibenzoylbenzene moietyRina Singh and Allan S. HayCite this: Macromolecules 1991, 24, 9, 2637–2639Publication Date (Print):April 29, 1991Publication History Published online1 May 2002Published inissue 29 April 1991https…