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Abstract In this study we investigate the effect of crystallization rate on the extensibility (draw ratio) of spherulitic polyethylene film uniaxially deformed at room temperature. Draw ratios for deformed films increased with increasing crystallization temperature. Transmission electron microscopy of the microfibrill…
The dielectric and dilatometric properties of RbHSeO 4 are studied. It is found that RbHSeO 4 undergoes a phase transition at 173°C besides the 98°C phase transition and it is ferroelectric below the 173°C transition.
Boron content dependences of saturation magnetostriction λs at room temperature in as-quenched and annealed Fe100−xBx (15?x?25) and Co100−xBx (19?x?24) amorphous alloys were measured. The value of λs in Fe-B alloys peaks at x=20, while λs in Co-B alloys decreases with increasing boron content. For two series of alloys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCavitation-induced polymerization of nitrobenzeneD. James. Donaldson, Michael D. Farrington, and Peeter. KruusCite this: J. Phys. Chem. 1979, 83, 24, 3130–3135Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of organic bichromophoric moleculesHarry MorrisonCite this: Acc. Chem. Res. 1979, 12, 11, 383–389Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November 1979https://pubs.acs.org/doi/10.1021/ar50143a00…
Abstract When glycerol is heated with an alkaline catalyst to over 230 C, water is evolved and polymerization occurs to form a whole family of polyglycerols ranging from diglycerol with 3 hydroxy groups, to triacontaglycerol with 32 hydroxy groups. The carboxylic acid esters of polyglycerols prepared by direct esterif…
In order to get a simple and accurate description of complex crystal structures, the stella quadrangula is used as a building unit to describe the following structures: SiF4, scheelite, NaZn13, Ru7B3 and Ba3Fe3Se7.
The isomer shift and the quadrupole splitting of 57Fe in the pyrite-type dichalcogenides, FeS2–CoS2–NiS2–NiSe2 and CoSe2, were measured at room temperature. It is concluded that the effects of atomic distance and electronegativity of ligand make comparable contributions to the isomer shift of a divalent iron in low sp…
We describe a technique for exposing patterns of spatial period p/n using near-field diffraction from masks of spatial period p. The technique, which we propose to call ’’spatial-period-division’’, can be used with visible, UV, or x-ray radiation. With soft x rays, it is possible to produce gratings of much finer spat…
Deuterium magnetic-resonance studies of spectral patterns from spinning samples are made to measure the relative contribution of various orientational order mechanisms to the biaxiality of the hydrocarbon chain in the smectic $C$ phase. The detailed theory of motional averaging as applied to the spinning techniques is…
Abstract The different types of morphology that can be developed in a large number of low‐density (branched) polyethylene whole polymers, as well as in a series of fractions, have been studied for two different extreme crystallization modes. Concomitantly, thermodynamic properties of the same samples have also been de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the metamagnetic 1:1 1-D phase of the decamethylferrocenium 7,7,8,8-tetracyano-p-quinodimethanide: Fe[C5(CH3)5]2+.cntdot.(TCNQ)-.cntdot.Joel S. Miller, Arthur H. Reis Jr., E. Gebert, J. J. Ritsko, W. R. Salaneck, L. Kovnat, Thomas W. Cape, a…
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Abstract Secondary nucleation kinetics for potash alum in draft‐tube baffled crystallizers have been determined from steady state crystal size distributions measured down to about 5 μm. Differences in nucleation rates were found for crystallizers of similar geometry but different capacity. Models relating the frequenc…
Abstract The thermal transition behavior of a series of hydroxy terminated polybutadiene (HTPBD) containing segmented polyurethanes has been studied by differential scanning calorimetry (DSC) and thermal mechanical analysis (TMA). Four transition regions are observed; the soft segment T g , at −74°C, two hard segment…
In this paper we study theoretically and experimentally the transport of electrons in Teflon FEP type A under isothermal conditions (145 °C) in open circuit. We suggest a theoretical model including surface, shallow, and deep traps. The model leads to a system of partial differential equations which was solved numeric…
Abstract The modules and birefringence of oriented polymers are known to couple through the structural and intrinsic properties of the polymer. Recent developments in both optical and mechanical theories have allowed this coupling to be expanded so that it includes predictions of modulus and refractive indices of unia…
The misorientation dependence of grain boundary sliding and effects of grain boundary structure and crystal deformation on sliding have been studied by experiments using 〈1010〉 tilt zinc bicrystals with different misorientations. The results have shown that grain boundary sliding strongly depends on the misorientation…
High-resolution electron-microscope images in conjunction with selected-area electron diffraction were used to investigate the short-range order in PbMg1/3Nb2/3O3. Intensity fluctuations of the [110] image indicated ordered domains extending over about 20 to 50 Å. Decomposition phases were observed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical properties and electronic interactions of microcrystalline copper/zinc oxide (Cu/ZnO) catalystsJohn B. Bulko, Richard G. Herman, Kamil. Klier, and Gary W. SimmonsCite this: J. Phys. Chem. 1979, 83, 24, 3118–3122Publication Date (Print):November 1, 1979Publication His…