1,720,990 research outputs found
Thermoplastic elastomers: structural and morphological aspects of ether-esteramide copolymers
No full textPolyesteramide 6NT6 (I)-polytetramethylene ether glycol (II) copolymers, pptd. from dil. soln. were studied by small-angle x-ray scattering (SAXS) and wide-angle x-ray scattering (WAXS) with variation of the II content. A comparison of the structural characteristics of these materials was made with those of I, which consists of -CO-p-C6H4CONH(CH2)6NHCO-p-C6H4CO2(CH2)6O- units. Chain folding is assumed as the crystn. mechanism for the low-II content copolymers, with possible inclusion of polyether segments within the I crystal lattice. WAXS data support the view of a weakening of the I cryst. packing in the equatorial planes as the reason for broadening of the diffraction peaks, for changes in their relative intensities, and for the increase in the equatorial interplanar distances in the high-II content samples. The annealing behavior was investigated
Crystal structure of the complex of Palladium(II) with the N-methyl, N-phenyl-hydrazone of acetone
No full textNoncovalent interactions in ternary complexes of the spermine with copper(II) and adenosine-5'-triphosphate and tripolyphosphate
No full textSelective hydrogenation of ketones and olefins over polymer-bound Rhodium catalysts
No full textSelective hydrogenation of olefins and ketones promoted by polymer-bound cationic rhodium(I) catalysts is reported. A different catalytic behaviour is found depending on the substituents on the phosphorus atom of the polymeric ligand. The effect of the polymer on the stability of supported complexes towards reduction, and on the fate of the catalysts is discussed. In some cases polymer trapped Rh11 compounds are present at the end of the catalytic cycle. © 1975
Pseudomonas sp. lipase catalytic activity in supercritical carbon dioxide
No full textChiral 1-phenylethanol, 1-cyclohexylethanol, 2-octanol, 6-methyl-5-hepten-2-ol, and trans-3-penten-2-ol have been prepd. in high enantiomeric excess (> 80%) via enantioselective acetylation of the corresponding racemic alcs. using immobilized crude lipase (Pseudomonas sp. from Amano) in supercrit. carbon dioxide. [on SciFinder(R)
Studi Cinetici e Modellistici sul Riconoscimento Molecolare di esteri 2-Arilpropionici ad Opera di Lipasi di candida rugosa e Rhizomucor miehei
No full textDOPING KINETICS OF POLYACETYLENE IN THE SHORT RANGE
No full textThe kinetics of doping with I of polyacetylene films, synthesized by the H. Shirakawa technique (Ito, T. S.; Ikeda, S., 1974) was studied by measuring the variation of elec. cond. and IR absorbance at 1400, 1023, and 750 cm-1 within the 1st min of doping. The doping process occurs within ≥3 steps whose rate consts. differ by orders of magnitude. An attempt was made to elaborate a kinetic model for the doping process, and the activation energies are calcd
Computational studies on the mechanism of 2-arylpropionic esters hydrolysis catalized by Candida cylindracea lipase
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