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Abstract Ammonium polyphosphate is shown to be an effective flame retardant for homopolymeric and selected fibre‐forming copolymers of acrylonitrile. Compared with other phosphates and phosphorus‐containing species, it significantly increases both limiting oxygen index and char levels. The mechanism of retardancy is s…
Dielectric and light scattering measurements are performed in lanthanum modified lead zirconate titanate (PLZT) (6–8)/65/35 hot-pressed ceramics in order to refine the phase diagram. A relaxor-ferroelectric phase transition takes place in PLZT (6–7)/65/35 at temperature lower than the temperature of the dispersive die…
Abstract The properties of sphingomyelin obtained from bovine milk were investigated. In particular, the properties of liposomes and emulsions prepared from the spingomyelin, as well as the liquid crystalline behavior, were investigated and compared to those of related phosphatidylcholine systems. Like sphingomyelins…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAluminum-Nitrogen Multiple Bonds in Small AlNH Molecules: Structures and Vibrational Frequencies of AlNH2, AlNH3, and AlNH4Randall D. Davy and Kent L. JaffreyCite this: J. Phys. Chem. 1994, 98, 36, 8930–8936Publication Date (Print):September 1, 1994Publication History Publis…
Abstract Melt strength data are presented for polypropylenes, differing widely in molecular weight and molecular weight distribution. Melt strength was assessed from uniaxial tensile experiments with a Rheotens apparatus. A new measuring procedure was applied by performing the stretching in front of the take-up wheels…
Thin layers of niobium oxide ( NbO x ) were accumulated by the sol‐gel process, with the sol of NbO x in ethanol prepared by partial hydrolysis of commercial niobium(V) ethoxide, on glass plates coated with transparent conducting tin oxide. Characterization by x‐ray diffraction, differential thermal analysis, and ther…
The phase sequence of a new family of chiral smectic liquid crystals, represented by 4-(1-methylhepthyloxycarbonyl) 3-fluorophenyl 4 ′ -dodecylbiphenyl-4-carboxylate (MHFPDBC), were investigated by measurements of dielectric dispersion under various bias field strengths. Three phases, ferrielectric smectic C γ * phase…
The pseudoelastic behaviour associated with the martensitic transformation (MT) of TiNi shape memory alloys subjected to strain variations has been investigated experimentally. The results are summarized as follows. Firstly, with respect to strain variations within the MT region: (1) The reverse transformation stress…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimple Density Functional Approach to Polarizability, Hardness, and Covalent Radius of Atomic SystemsTapan K. Ghanty and Swapan K. GhoshCite this: J. Phys. Chem. 1994, 98, 37, 9197–9201Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Pu…
Forty-two different carbon sources were tested for the polyester synthesis of a citronellol-utilizing bacterium, Pseudomonas citronellolis (ATCC 13674). These included linear C(2) to C(10) monocarboxylic acids, C(3) to C(10) dicarboxylic acids, saccharides, alpha,omega-diols, hydrocarbons, and 3-methyl-branched substr…
The refractive index of binary tellurite glasses with various modifiers was measured down to the fifth decimal place in the wavelength range of 0.40–1.71 μm using the minimumedeviation method. An empirical equation based on the single‐oscillator Drude–Voigt dispersion equation. n d 2 = A·Nf λ 0 2 + B , is obtained, wh…
BaTiO 3 films of various thicknesses were grown on doped and undoped SrTiO 3 (100) substrates and on (La, Sr) 2 CuO 4 films by a pulse laser deposition method. Both BaTiO 3 and (La, Sr) 2 CuO 4 films were smooth and free of particulates. X-ray diffractometry showed that all materials were three-dimensionally aligned w…
Several of the chromophore molecules considered for use in nonlinear optical polymers exhibit photoisomerization. This photoinduced transformation from one isomer to another changes the shape of the dipolar molecule and thus often enhances its mobility within a polymer matrix. Consequently, the molecular dipoles can s…
The crystal structure of the Al3Pd phase, considered to be a closely related structure to decagonal quasicrystals with a period of about 1.6nm, has been determined by a combination of single-crystal X-ray analysis and high-resolution electron microscopy. The atomic model, which has about 280 atoms in an orthorhombic u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction and Aggregation of Silver Ions at the Surface of Colloidal SilicaDarren Lawless, Sudhir Kapoor, Pierre Kennepohl, Dan Meisel, and Nick SerponeCite this: J. Phys. Chem. 1994, 98, 38, 9619–9625Publication Date (Print):September 1, 1994Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyiron Oxo Chemistry at the Molecular/Solid-State Boundary: Synthesis, Structure, and Magnetic and Moessbauer Properties of [Fe16MO10(OH)10(O2CPh)20] Complexes, M = Mn, Fe, or CoWolfgang Micklitz, Vickie McKee, R. Lynn Rardin, Laura E. Pence, Georgia C. Papaefthymiou, Simo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid Crystal Transition and Crystallization Kinetics in Poly(ester imide)sRicardo Pardey, Scott S. Wu, Jianhua Chen, Frank W. Harris, Stephen Z. D. Cheng, Andrew Keller, Jerry Aducci, John V. Facinelli, and Robert W. LenzCite this: Macromolecules 1994, 27, 20, 5794–5802Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonochemical Destruction of CFC 11 and CFC 113 in Dilute Aqueous SolutionH. Michael. Cheung and Shreekumar. KurupCite this: Environ. Sci. Technol. 1994, 28, 9, 1619–1622Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue…
The anisotropic thermal diffusivity α of the highly c -axis-oriented Y–Ba–Cu–O bulk superconducting crystals has been measured quasi-simultaneously with the thermal conductivity κ. The estimated values of the specific heat C by use of α and κ values parallel and perpendicular to the c -direction agreed with each other…
Amorphous fluoropolymers (AF) have recently been developed to provide several favorable characteristics not present in the more crystalline materials. However, these polymers have not been fully characterized and reports of surface modification are not extensive. This work presents results of surface analysis and modi…