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Digitale Medien

The first excited triplet states of the nucleotide bases calculated with different semiempirical SCF schemes (1969)

Packer, J. C. ; Avery, J. S. ; Ladik, J. ; [weitere]

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 3 (1969), S. 79-92

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ISSN: 0020-7608

Schlagwort(e): Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The π-electron distributions, spin densities, and energies of the first triplets of the nucleotide bases, uracil, thymine, cytosine, adenine, and guanine, were investigated in various semiempirical approximations. Results are presented for calculations using the semiempirical form of the closed-shell SCF configuration interaction method, of the different orbitals for different spins (unrestricted Hartree-Fock) treatment, with and without spin projection, and of the Roothaan's open-shell procedure.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/qua.560030112

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2

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Some rheological properties of molten polypropylene (1968)

Adamse, J. W. C. ; Janeschitz-Kriegl, H. ; Den Otter, J. L. ; [weitere]

New York : Wiley-Blackwell

Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 871-883

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ISSN: 0449-2978

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The following measurements were carried out on the melts of two samples of polypropylene, one with a narrow and one with a broad molecular weight distribution: viscosity in steady shear flow, dynamic storage and loss moduli, total normal thrust in cone-and-plate apparatus, and flow birefringence. The validity of various theoretical interrelations between the measured quantities is checked. The influence of molecular weight distribution is qualitatively discussed.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1968.160060507

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3

Digitale Medien

Light scattering from PVC solutions (1967)

Vavra, J. ; Lapčík, J. ; Sabadoš, J.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 1305-1308

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ISSN: 0449-2978

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1967.160050626

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4

Digitale Medien

Infrared study of poly(vinyl fluoride) (1966)

Koenig, J. L. ; Mannion, J. J.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-2: Polymer Physics 4 (1966), S. 401-414

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ISSN: 0449-2978

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Poly(vinyl fluoride) polymers prepared at different polymerization temperatures have been examined in the melt, oriented, and solid state by infrared spectroscopy. Bands arising from the head-to-tail and head-to-head-tail-to-tail portions of the polymer have been isolated and assigned. The head-to-head-tail-to-tail portion of the polymer crystallizes in the head-to-tail unit cell except for a portion of the 1,2-difluorethylene units which apparently have the gauche (out-of-plane) structure. The head-to-tail portion of the polymer is nearly atactic, but is somewhat rich in syndiotactic chain structure. Bands arising from local syndiotactic order are observed.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1966.160040310

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5

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Untersuchung der physiko-chemischen Mechanismen der Oxido-Reduktion von porösen mit Cadmiumhydroxid imprägnierten Elektroden (1966)

Harivel, J. P. ; Morignat, B. ; Migeon, J. ; [weitere]

Weinheim : Wiley-Blackwell

Chemie Ingenieur Technik - CIT 38 (1966), S. 671-675

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ISSN: 0009-286X

Schlagwort(e): Chemistry ; Industrial Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Es wird der Einfluß der Stromstärke, der Temperatur und der KOH-Konzentration bei der Ladung auf die Kapazität der Elektroden durch Messung der bei der Entladung mit konstanter Stromstärke bzw. konstanter Spannung abgegebenen Elektrizitätsmenge bestimmt. Diese Ergebnisse gemeinsam mit Löslichkeitsbestimmungen des Cd(OH)2 in KOH und Röntgenfeinstruktur-Analysen der Elektroden lassen Schlüsse auf die physikalisch-chemischen Vorgänge an den negativen Platten von Nickel/Cadmium-Akkumulatoren zu.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cite.330380618

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6

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Amino-acid sequence study in peptides by mass spectometry-IIFor Part I see Ref. 3.. Investigation of pentadeuterobenzoyl-peptide methyl esters (1968)

Kamerling, J. P. ; Heerma, W. ; Penders, Th. J. ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 1 (1968), S. 345-350

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The utility of benzoyl and pentadeuterobenzoyl derivatives of peptide methyl esters for mass spectrometric analysis was investigated. The mass spectra of the glu-his and the val-tyr-pro derivatives are discussed. Treatment of the peptide methyl esters with the mixed benzoic-ethyl-carbonic anhydride did in some cases lead to benzoyl derivatives as well as to ethoxycarbonyl derivatives.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210010304

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7

Digitale Medien

Cyclopolymerization of diastereomeric diepoxides (1967)

Stille, J. K. ; Hillman, J. J.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2067-2077

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ISSN: 0449-296X

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The meso- and d,l-diastereomers of o-bis(epoxyethyl)benzene have been synthesized and identified. The diastereomers were polymerized by a variety of catalysts to give a polymer which has mainly isochroman recurring units as a result of a cyclopolymerization mechanism. Some features of the polymerization with the triisobutylaluminum catalyst system have been studied. The rates of polymerization of the monomers and the transition temperatures of the resulting polymers have been determined. The results are explained on the basis of a controlled intramolecular propagation and a stereospecific polymerization.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1967.150050823

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8

Digitale Medien

The polymerization of styrene oxide by the triisobutylaluminum-water system (1967)

Stille, J. K. ; Hillman, J. J.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2055-2065

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ISSN: 0449-296X

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Styrene oxide has been polymerized by the triisobutylaluminum-water catalyst system. Kinetic studies of the effects of varying the monomer, triisobutylaluminum, and water concentrations in benzene solutions have been made. Styrene oxide was consumed in two reactions: an initial fast one producing trimer and a slower reaction forming higher molecular weight polymer.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1967.150050822

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9

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Synthesis of 4-vinylbiphenyl-isoprene block copolymers and their characterization by gel-permeation chromatography (1969)

Heller, J. ; Schimscheimer, J. F. ; Pasternak, R. A. ; [weitere]

New York : Wiley-Blackwell

Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 73-81

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ISSN: 0449-296X

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 4-Vinylbiphenyl-isoprene ABA block copolymers were prepared by initiating 4-vinylbiphenyl with n-butyllithium in benzene, adding isoprene, and coupling the resulting AB anion with phosgene. Preliminary coupling experiments with a polyisoprene anion have shown that virtually quantitative coupling could be achieved provided the phosgene was added extremely slowly. The block copolymers could be quantitatively analyzed by gel-permeation chromatography from a knowledge of the ratio of the refractive index increments of the two homopolymers and the overall composition.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1969.150070108

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10

Digitale Medien

Polymerization and copolymerization of α-methacrylophenone (1968)

Mulvaney, J. E. ; Dillon, J. G. ; Laverty, J. L.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 1841-1848

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ISSN: 0449-296X

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Under a variety of conditions it has not been possible to induce the free-radical-initiated homopolymerization of α-methacrylophenone (α-MAP). The only product isolated from such efforts was the Diels-Alder dimer of the monomer. A Mayo-Lewis plot of the free-radical copolymerization of α-MAP and styrene shows considerable scatter but the copolymer composition indicates that an α-MAP unit can add to itself. These results have been ascribed to a penultimate effect. α-MAP is homopolymerized by dimsylsodium or n-butyllithium. Attempted copolymerization of α-map and styrene with n-butyllithium produces 〉95% α-MAP. Unexpectedly, α-MAP does not homopolymerize with lithium dispersion, but does react in the presence of styrene to give product containing a relatively small amount of α-MAP.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1968.150060706

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