Materials Literature
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Abstract The crystalline morphology of injection‐molded polypropylene (PP), its relationship with crazing, and the effects of various impact modifiers on the morphology, crystallization, and fusion of PP have been studied. The highly oriented skin layer of an injection‐molded tensile bar after deformation was found to…
Natural (types Ia and IIa) and synthetic (type Ib) diamonds have been irradiated with energetic electrons and neutrons and then heated at temperatures up to 1400°C. Attendant changes in the infrared absorption spectra, especially above the Raman frequency (1332 cm−1), have been monitored. The most prominent absorption…
The two phosphates CsCoPO4 and CsZnPO4 are each shown to undergo two different phase transitions when heated above room temperature. The first one—form class 2 to presumably class 2 mm—is a ferroelastic to paraelastic transition, whereas the second one, occurring at a higher temperature—presumably from class 2 mm to c…
Abstract The synthesis of sulfonated poly(phenylene oxide) polymer was investigated. The poly(phenylene oxide) was synthesized through oxidative coupling from 2,6‐dimethyl‐phenol with copper (I) chloride‐pyridine catalyst and sulfonated using chlorosulfonic acid. The effects of catalyst concentration, solvent, and oth…
Sodium‐sulfate‐induced hot corrosion of preoxidized IN‐738 was studied at 975°C, with emphasis on processes occurring during the long induction period. Thermogravimetric tests were run for predetermined periods of time, after which one set of specimens was washed with water to give information about water‐soluble meta…
With the aim to develop a standard method for measurements of the polarization of ferroelectric chiral smectic C liquid crystalline materials, we have studied thin, well-aligned samples of MBRA-8 using the field-reversal method. The method also provides an estimate for the rotational viscosity and for the response tim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTYields of glyoxal and methylglyoxal from the nitrogen oxide(NOx)-air photooxidations of toluene and m- and p-xyleneErnesto C. Tuazon, Roger. Atkinson, Helene. Mac Leod, Heinz W. Biermann, Arthur M. Winer, William P. L. Carter, and James N. PittsCite this: Environ. Sci. Techn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence and NMR studies of the conformational isomers of lanthanide complexes with an optically active polyaza polycarboxylic macrocycleHarry G. Brittain and Jean F. DesreuxCite this: Inorg. Chem. 1984, 23, 26, 4459–4466Publication Date (Print):December 1, 1984Publicati…
The influence of sulfate-reducing bacteria on the corrosion of mild steel and the effects of subsequent aeration were investigated using test vessels in which the base of the vessel was formed by steel foil test pieces. Corrosion rates were determined by weight loss measurements from foils and by electrical resistance…
The DNA sequence of the Escherichia coli metK gene has been determined. Protein sequence data for purified S-adenosylmethionine synthetase have also been obtained and confirm that metK is the structural gene for S-adenosylmethionine synthetase in E. coli. The sequence of the amino-terminal 35 residues of purified S-ad…
Abstract Melt polymerization conditions for D , L ‐lactide initiated with tetraphenyltin were studied with regard to polymer molecular weight and weight distributions. “Single” polymerization, “multiple” polymerization (four or eight reactions at the same time), and time‐dependent studies are described. Single polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe .pi.-.pi. interactions and bandwidths in molecular metals. A chemical, structural, photoelectron spectroscopic, and Hartree-Fock-Slater study of monomeric and cofacially joined dimeric silicon phthalocyaninesE. Ciliberto, K. A. Doris, W. J. Pietro, G. M. Reisner, D. E. E…
Abstract A new conceptual model for interstratified clays is proposed, based on complementary use of the transmission electron microscope (TEM) and X-ray diffraction (XRD). Clays yielding interstratified XRD patterns are shown to be composed of aggregates of fundamental particles (here defined as an individual or free…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn associative mechanism for reductive elimination of d8 NiR2(PR3)2Kazuyuki Tatsumi, Akira Nakamura, Sanshiro Komiya, Akio Yamamoto, and Takakazu YamamotoCite this: J. Am. Chem. Soc. 1984, 106, 26, 8181–8188Publication Date (Print):December 1, 1984Publication History Publish…
The Landau theory of blue phases (BP) in cholesteric liquid systems is further developed by systematically including the effect of higher harmonics in the structure factor on the free energy. The inclusion of a third harmonic results in two new body-centered-cubic (bcc) structures, ${O}_{b}^{8}$ and ${O}_{c}^{8}$, in…
Structures corresponding to various potential energy minima have been examined for a classical model whose pair interactions produce a body-centered-cubic crystalline ground state. The method used is molecular dynamics computer simulation for 128 particles with frequent steepest-descent mapping onto nearby minima. The…
A new photosensitive high temperature polymer stable up to 500%deg;C with high photosensitivity and high resolution has been developed. The trend toward a high degree of integration in solid-state technology requires the use of new high temperature photosensitive insulating materials. Toray's Photoneece system provide…
The properties of the nematic-isotropic interface of some members of the homologous series of 4-cyano-4\ensuremath{'}-($n$-alkyl)biphenyl liquid crystals [$n$-pentyl (5CB), $n$-hexyl (6CB), $n$-heptyl (7CB), and $n$-octyl (8CB)] are studied by optical reflectometry. The thickness of the interface is obtained by measur…
Sulfolobus solfataricus is a thermophilic archaebacterium able to grow at 87 degrees C and pH 3.5 on glucose as sole carbon source. The organism metabolizes glucose by two main routes. The first route involves an ATP-dependent phosphorylation to give glucose 6-phosphate, which readily isomerizes to fructose 6-phosphat…
Abstract An experimental study of the development of phase morphology in incompatible polymer melt blends of polyethylene/polystyrene (PE/PS), polyethylene/polycarbonate (PE/PC), and polyethylene/nylon‐6 (PE/N6) is presented. Different temperatures (180°C, 240°C) of mixing and polyethylene molecular‐ weight levels wer…