Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of morphology on the transport of gases in block copolymersDavid J. Kinning, Edwin L. Thomas, and Julio M. OttinoCite this: Macromolecules 1987, 20, 5, 1129–1133Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1…
We now report the results of kinetic and trapping experiments performed in acetylene/benzene and acetylene/toluene mixtures above 820 K by modulated beam dynamic mass spectrometry which provide direct evidence of vinylidene participation in chemical reactions. Under such conditions the fast equilibrium \nHC=CH ⇌…
Measurements were made of the enthalpy changes, using sorption isotherms, and of the changes in dielectric response of microcrystalline cellulose discs when different amounts of water were added. The results are explained by means of a molecular model in which the water is sorbed in a step-wise process of hydrogen bon…
Abstract In summary, the solid-state C-13 NMR technique has proven to be a significant method for the detection of crosslinks and other structural modifications in sulfur-vulcanized NR systems. The use of sulfur as a crosslinking agent by itself generates a considerable amount of main-chain structural modifications. C…
Abstract The pore-size and particle-size distributions as well as the surface areas of Cs3PW12O40 and Cs3PMo12O40 have been determined by N2 adsorption and electron micrograph. It was first demonstrated by the quantitative comparison of these data that their micro-and/ or mesopores which gave these compounds very high…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational calculations on poly(di-n-hexylsilane)B. L. Farmer, J. F. Rabolt, and R. D. MillerCite this: Macromolecules 1987, 20, 5, 1167–1169Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987https://pubs.acs.org…
The propagation range of surface plasmons in thin-metal-film geometries can be considerably increased if a suitable dielectric layer is placed in parallel to the film. The results show that this range extension depends strongly on the separation between the metal film and the dielectric layer.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of dinuclear copper(II) complexes of 2,6-bis(N-(2-pyridylmethyl)formimidoyl)-4-methylphenolate with azido and cyanato-0 exogenous ligandsTalal Mallah, Olivier Kahn, Jacqueline Gouteron, Suzanne Jeannin, Yves Jeannin, and Charles J.…
Thermal shock testing of an alumina‐20 vol% SiC whisker composite showed no decrease in flexural strength with temperature differences up to 900°C. Alumina, on the other hand, normally shows a significant decrease inflexural strength with a temperature change of >400°C. The improvement in the thermal shock resistan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of a weak intermolecular photosensitive complex between an organic substrate and a polyoxometalate. Crystal and molecular structure of .alpha.-H3PMo12O40.cntdot.6DMA.cntdot.CH3CN.cntdot.0.5H2O (DMA = N,N-dimethylacetamide)Michael M. Williamson, Donald A. Bou…
The polymorphism of enstatite (MgSiO 3 ) is reviewed. Three stable phases occur—clinoenstatite, orthoenstatite, and protoenstatite, being stable at low, intermediate, and elevated temperatures, respectively — and new data concerning their crystallization from synthetic glasses are summarized. The phase transformations…
A test particle model (T-model) potential is derived for interacting rigid formamide (HCONH2) molecules and applied in MD simulations of the liquid phase. The most important features of the dimers predicted by the T-model potential are checked by large basis set SCF calculations. The most stable dimer is the cyclic ar…
Reaction of anionic platinum(II) derivatives (NBu4)[Pt(C6F5)3L] with O3ClOAgL′ affords the neutral heterobinuclear complexes (C6F5)3LPtAgL′ (L′ = PPh3, PEt3; L = SC4H8, PPh3, PEt3, PEtPh2, NC5H5) containing a direct Pt-Ag bond unsupported by covalent bridges. The molecular structure of a representative compound (L = S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical copolymerization of pyrrole with N-substituted pyrroles. Effect of composition on electrical conductivityJohn R. Reynolds, Paul A. Poropatic, and Rita L. ToyookaCite this: Macromolecules 1987, 20, 5, 958–961Publication Date (Print):May 1, 1987Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric control of aggregation in neutral silver(I) thiolates, [AgSR]n. Crystal and molecular structures of [AgSCH(SiMe3)2]8, a discrete molecular biscycle of weakly interacting [AgSCH(SiMe3)2]4 units, and of [AgSC(SiPhMe2)3]3 and [AgSC(SiMe3)3]4, discrete molecular monocycle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(alkyl/arylphosphazenes)Robert H. Neilson, Rahim Hani, Patty Wisian-Neilson, John J. Meister, Aroop K. Roy, and Gary L. HagnauerCite this: Macromolecules 1987, 20, 5, 910–916Publication Date (Print):May 1, 1987Publication History Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of plasmon frequency in the optical spectrum of Au18Ag20 cluster: the beginning of the collective phenomenon characteristics of the bulk?Boon K. Teo, K. Keating, and Y. H. KaoCite this: J. Am. Chem. Soc. 1987, 109, 11, 3494–3495Publication Date (Print):May 1, 198…
Computationally efficient discrete space-time models of spatially-ordered pattern formation dynamics (e.g., block copolymer phase separation dynamics) are proposed. Models are simple but can give sufficiently realistic spatial patterns, and their time evolution.
This paper describes light control films consisting of submicron liquid crystal droplets dispersed in epoxy matrices. These films, which can respond optically to both applied electric fields and temperature changes, are potentially useful for displays and light shutters. The optical performance of these films depends…
Abstract The addition of tricresyl phosphate, N ‐phenyl‐2‐naphthylamine, and 4,4′‐dichlorodiphenyl sulfone to polysulfone causes changes in thermal and mechanical properties of the glassy mixtures associated with antiplasticization, i.e., reduction in glass transition temperature and increase in stiffness. These chang…