Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoil-globule type transitions in polymers. 2. Theory of coil-globule transition in linear macromoleculesT. M. Birshtein and V. A. PryamitsynCite this: Macromolecules 1991, 24, 7, 1554–1560Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDawson type heteropolyanions. 1. Multinuclear (phosphorus-31, vanadium-51, tungsten-183) NMR structural investigations of octadeca(molybdotungstovanado)diphosphates .alpha.-1,2,3-[P2MM'2W15O62]n- (M, M' = Mo, V, W): syntheses of new related compoundsMostefa Abbessi, Roland C…
The most highly oxidized polyaniline, in the form of pernigraniline base, can be synthesized as an analytically and oxidatively pure solid (powder or large free-standing films) by the controlled oxidation of emeraldine base by m-chloroperbenzoic acid or directly from aniline by oxidative polymerization with (NH4)2S2O8…
Electrochemical techniques such as: corrosion and critical pitting potential measurements, direct current potentiostatic and potentiodynamic polarization, linear polarization resistance, split-cell current measurements, electrochemical impedance, electrochemical noise, and electrical resistance probes are evaluated fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCp*MoO2Cl-catalyzed epoxidation of olefins by alkyl hydroperoxidesMary K. Trost and Robert G. BergmanCite this: Organometallics 1991, 10, 4, 1172–1178Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pub…
A transformer model which consists of a nonlinear core with hysteresis and multiple windings is described as implemented in DSPICE. In contrast to previous implementations, the nonlinear behavior of the new model is described by continuous piecewise-hyperbolic functions characterized by three parameters. These paramet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-scattering study of starlike polymeric micellesLena J. M. Vagberg, Kathleen A. Cogan, and Alice P. GastCite this: Macromolecules 1991, 24, 7, 1670–1677Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991http…
The quasi-one-dimensional (1D) conductor ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ undergoes a Peierls transition at ${\mathit{T}}_{\mathit{c}}$=183 K. Using cold-neutron scattering, we have succeeded in resolving in frequency and for wave vectors parallel to the chain direction the pretransitional dynamics and the col…
The glass transition length scale determined from formulae of a fluctuation approach (2ξ a = 2 ... 5 nm) is confirmed by two independent experimental methods. Firstly the glass transition parameters in self-organized amorphous layers of variable thickness in semicrystalline poly(ethylene terephtalate) show significant…
Abstract Weathered perthite and mixed muscovite-kaolinite from a kaolinitic granite at Trial Hill in east Queensland and kaolinized sericitic alteration from a granite from the Ardlethan Tin Mine of New South Wales were examined by optical, scanning electron (SEM), and transmission electron microscopy (TEM) to determi…
Nanocrystalline solids are polycrystals, the crystal size of which is a few (typically 1 to 10) nanometres so that 50% or more of the solid consists of incoherent interfaces between crystals of different orientations. Solids consisting primarily of internal interfaces represent a separate class of atomic structures be…
A minimum exists in the electrical conductivity of the perovskite-type ceramic ${\mathrm{LaCr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Mn}}_{\mathit{x}}$${\mathrm{O}}_{3}$ as a function of Mn content near x=0.05. This minimum has been explained in terms of a crossover from multiple trapping to percolation amon…
The dependency of the conductivity of polyaniline (emeraldine oxidation state) on its molecular weight has been determined. Uni- and biaxially oriented films and uniaxially oriented fibers of emeraldine base have been studied and the dependency of their degree of crystallinity, tensile strength, and conductivity (afte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHalo- and alkyl(pentamethylcyclopentadienyl)[1,2-bis(diphenylphosphino)ethane]iron(III) 17-electron complexes: synthesis, NMR and magnetic properties and EHMO calculationsChristophe Roger, Paul Hamon, Loic Toupet, Hassan Rabaa, Jean Yves Saillard, Jean Rene Hamon, and Claude…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotacticity effect on crystallization and melting in polypropylene fractions. II. Linear crystal growth rate and morphology studyJames J. Janimak, Stephen Z. D. Cheng, Paul A. Giusti, and Eric T. HsiehCite this: Macromolecules 1991, 24, 9, 2253–2260Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of poly(2-vinylpyridine)-poly (styrene) block copolymers from toluene solutionsEdward Parsonage, Matthew Tirrell, Hiroshi Watanabe, and Ralph G. NuzzoCite this: Macromolecules 1991, 24, 8, 1987–1995Publication Date (Print):April 1, 1991Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoregulation of papain activity through anchoring photochromic azo groups to the enzyme backboneItamar Willner, Shai Rubin, and Azalia RiklinCite this: J. Am. Chem. Soc. 1991, 113, 9, 3321–3325Publication Date (Print):April 1, 1991Publication History Published online1 May…
The thermodynamic properties of LaCrO 3 and related compounds have been estimated and utilized to correlate sinterability with phase relations in the La‐M‐Cr‐O ( M = Mg , Ca , Sr ) systems. Chemical equilibria calculations reveal that calculated vapor pressures of gaseous chromium oxides (especially CrO 3 ) can be wel…
Recent studies have established that not only some polymeric materials exhibit nematic biaxial phases, but that also low molecular weight compounds can do so if certain structural conditions are met. In this paper new developments in the field of thermotropic N, phases of low mass synthetic products are discussed rega…
The dielectric properties and conductivities (\ensuremath{\sigma}) of ${\mathrm{BaTiO}}_{3}$ doped with 0.03 mol % of ${\mathrm{La}}_{2}$${\mathrm{O}}_{3}$ or ${\mathrm{Gd}}_{2}$${\mathrm{O}}_{3}$ were investigated in the temperature range of 10--300 K. A speculation over the experimental results, such as the temperat…