Materials Literature
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An enhanced coercivity of sintered Nd-Fe-B permanent magnets by Al or Ga additions that is associated with a change in microstructure has been demonstrated. These microstructural modifications were detected by energy dispersive X-ray analysis (EDX)-assisted transmission electron microscopy (TEM). Two new ternary phase…
Different solvated charge-transfer salts between quinolin-8-ol (Hquin) and phosphotungstic acid have been synthesized and characterized. Spectroscopic data support the presence of a sizeable electronic interaction between electron-rich aromatic organics and the inorganic acid, both in the solid state and in solution,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistribution of activation enthalpies in viscoelastic relaxationsHoward W. Starkweather Jr.Cite this: Macromolecules 1990, 23, 1, 328–332Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 January 1990https://pubs.acs.org…
Poly (L-lactic acid) [L-PLA] microcapsules containing phenobarbitone were prepared from a w/o emulsion system, using light liquid paraffin as the continuum and a solution of phenobarbitone and L-PLA in acetonitrile as the disperse phase. Increasing stirring rate and emulsifying agent concentration were found to reduce…
Water-soluble conducting poly(aniline propane sulphonic acid) and its sodium salt have been synthesized by derivatization of polyaniline; multiple and reversible colour changes were observed for polymer films on indium–tin oxide coated glass dipped in a LiClO4/acetonitrile solution between –0.4 and 1.2 V vs. Ag/AgCl,…
The need for resistance to surface tracking and erosion partially differentiates outdoor insulation from indoor insulation. A review of the current status of development of standards for testing these properties worldwide on materials and components is presented. Of special interest is the self-restoration of the hydr…
Three-dimensional (3-D) braiding technology using high-performance fibres for advanced composite structures is receiving great attention as a result of the outstanding mechanical and thermoelastic properties of the materials produced. There are now mainly two groups of 3-D braiding techniques, namely, the four-step an…
Experimental and theoretical results on polyimide-to-metal and -ceramic adhesion are briefly reviewed. In general, the polyimide-on-metal interfaces have stronger interactions vis-a-vis the metal-on-polyimide interfaces. A section is also devoted to adhesion promoters and their effect on the adhesion. Data from the li…
We present the phase diagram of a system of hard spherocylinders, including the isotropic liquid and the nematic and smectic-A liquid crystals, calculated with a nonlocal-density-functional model for the free energy. We get first- and second-order nematic--smectic-A transitions, with a tricritical point at L/D=50, and…
The reaction of [(cyclo-C6H11)7Si7O9(OSiMe3)(OH)2] with CrO3 leads to the formation of [(cyclo-C6H11)7Si7O11(OSiMe3)CrO2], a new crystallographically characterized silyl-chromate complex that catalyses the polymerization of ethylene in the presence of trialkylaluminium reagents.
Abstract A new method omitting oxygen removal procedures from polymerization mixtures was developed for graft polymerization of acrylamide (AAm) onto the surface of poly(ethylene terephthalate) (PET) film with the simultaneous UV irradiation method without photo‐sensitizer. UV irradiation of the PET film with a high p…
[NMe4][CuPt(CN)4] contains an infinite 3D [CuIPtII(CN)4]nn– framework related to the PtS structure, which generates two mutually perpendicular and equivalent sets of hexagonal channels of large cross-section (largest Pt ⋯ Pt diagonal, 13.50 Å) together with large empty square channels perpendicular to the hexagonal ch…
The analytical theory of the conformations of end-grafted polymer ‘brushes’ is compared to direct numerical solutions of the mean-field equations developed by Scheutjens and Fleer. For moderately large chain length N, the predicted distribution of chain free ends and parabolic monomer density profile are confirmed in…
The Fourier transform technique developed for the design of variable refractive index coatings such as rugate filters is improved to achieve an accurate correspondence between optical properties and the refractive index profile. An application to the design of narrowband reflectors is presented.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of solution polymerization of polyphosphazenesAshutosh N. Mujumdar, Scott G. Young, Robert L. Merker, and Joseph H. MagillCite this: Macromolecules 1990, 23, 1, 14–21Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published iniss…
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The surface oxidation of a wood-based activated carbon by heat treatment in oxygen and carbon dioxide has been studied by diffuse reflectance Fourier transform infrared spectroscopy and compared with the results of aqueous oxidation by hydrogen peroxide and nitric acid. Untreated carbon gave infrared bands due to CO,…
Abstract Two types of hetero–metal assemblies {NBu4CuCr(ox)3]}x (1) and {[{Cu(bpy)}2Cr(ox)3]NO3}x (2)(NBu4 = tetrabutylammonium ion, ox = oxalate ion, bpy = 2,2′-bipyridine, x = infinite number) have been synthesized and their cryomagnetic properties (4.2–300 K) have been examined. The compound 1 has an oxalate-bridge…
The first product formed upon interaction of CO with the surface of fully dehydroxylated MgO is CO2–2. This species is generated by nucleophilic attack of a surface O2– on CO weakly σ-bonded on an Mg2+ cation in an adjacent position. The CO2–2 species generates C3O2–4 by addition of 2 CO molecules. Trimeric species (a…
Cuttings of 6-week-old Norway spruce (Picea abies (L.) Karst.) seedlings were placed in liquid media containing various concentrations of Ca2+. Cytoplasmic concentrations of Ca2+ were manipulated using the ionophore A 23 187. The effects of Ca2+ concentrations on the deposition of total cell wall material as well as o…