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1

Digitale Medien

Thermodynamic characterization of interpenetrating polymer networks of poly (carbonate-urethane) and poly (methyl methacrylate) (1994)

Privalko, V. P. ; Azarenkov, V. P. ; Baibak, A. V. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2625-2628

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ISSN: 0887-624X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Crosslinked poly (methyl methacrylate) and poly (carbonate-urethane) as well as full interpenetrating network on their base (IPN) were characterized by precise heat capacity measurements in the temperature interval 1.2-150 K. As judged by the positive sign of the excess Gibbs free energy in the whole temperature interval above 30 K, the apparently single-phase state of IPN is thermodynamically unstable; however, its kinetic stability is ensured by permanent chamical crosslinks prohibiting the incipient phase separation. © 1994 John Wiley & Sons, Inc.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1994.080321403

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2

Digitale Medien

Synthese und Eigenschaften von aromatischen Polyamiden, die durch Matrizen-Polykondensation bei niedrigen Temperaturen erhalten wurdenHerrn Professor Dr. sc. nat. Gerhard Reinisch zum 60. Geburtstag gewidmet (1990)

Vinogradova, S. V. ; Vygodskij, Ja. S. ; Koršak, V. V. ; [weitere]

Weinheim : Wiley-Blackwell

Acta Polymerica 41 (1990), S. 489-492

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ISSN: 0323-7648

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Beschreibung / Inhaltsverzeichnis: Polymer mixtures of poly(phenylenebenzimidazole terephthalamide) and poly(anilinfluorene terephthalamide) have been prepared by synthesis of the one polymer in the matrix of the other. The effect of the matrix polymer on the creep, deformation, and strength behaviour of films made from the polymer mixtures is investigated.

Notizen: Polymermischungen aus Poly(phenylenbenzimidazolterephthalamid) und Poly(anilinfluorenterephthalamid) wurden durch Synthese eines Polyamids in der Matrix des anderen hergestellt. Der Einfluß des Matrix-Polymers auf das Kriech-, Deformations- und Festigkeitsverhalten von Folien aus den Polymermischungen wurde untersucht.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/actp.1990.010410905

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3

Digitale Medien

Influence of polymer structure inhomogeneity on oxygen quenching of phenanthrene phosphorescence in poly(methyl methacrylate) (1992)

Bagryansky, V. A. ; Korolev, V. V. ; Tolkatchev, V. A. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 951-958

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ISSN: 0887-6266

Schlagwort(e): PMMA structure inhomogeneity ; oxygen quenching of phenanthrene ; the kinetics of phosphorescence ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Decay kinetics of phenanthrene phosphorescence in atactic poly(methyl methacrylate) have been studied at 130-170 K in the presence of dissolved oxygen. The kinetics show anomalous behavior and cannot be described in terms of homogeneous diffusion of oxygen. Analysis of the dependence of the kinetics on oxygen concentration shows that such behavior is well accounted for by a polychromatic model assuming a dispersion of diffusion coefficients due to the inhomogeneity of the polymer structure. Possible errors in determining the diffusion coefficient from the phosphorescence quantum yield on the assumption of homogeneous diffusion are discussed. © 1992 John Wiley & Sons, Inc.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/polb.1992.090300903

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4

Digitale Medien

Microscopic anatomy and ultrastructure of the introvert of Priapulus caudatus and P. tuberculatospinosus (Priapulida) (1994)

Storch, V. ; Higgins, R. P. ; Malakhov, V. V. ; [weitere]

New York, NY : Wiley-Blackwell

Journal of Morphology 220 (1994), S. 281-293

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ISSN: 0362-2525

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Introverts of Priapulus caudatus and P. tuberculatospinosus bear 25 rows of scalids, as well as 8 spines and scattered papillae in the region the circumoral lip. These, as well as the first ring of pharyngeal teeth in P. tuberculatospinosus, are sensory organs. Although superficially they differ between species, they are all characterized by apical and/or subapical openings which are located on tiny cuticular tubules. All sensory organs contain cilia bearing bipolar receptor cells. The 8 sensory spines situated between the circumoral area and the beginning of the scalids are ultrastructurally similar to the scalids. The introvert and pharyngeal body walls, and associated muscles are described. © 1994 Wiley-Liss, Inc.

Zusätzliches Material: 26 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jmor.1052200307

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5

Digitale Medien

Stereochemistry of aminolysis of N-pentafluorophenylcarbonimidoyl dichloride. Crystal and molecular structures of N2-pentafluorophenyl-N1,N1-dibenzylchloroformamidine (1993)

Mikhailov, V. A. ; Yufit, D. S. ; Balabanov, E. Yu. ; [weitere]

Chichester : Wiley-Blackwell

Journal of Physical Organic Chemistry 6 (1993), S. 319-325

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ISSN: 0894-3230

Schlagwort(e): Organic Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: It has been established that the product of the reaction of N-pentafluorophenylcarbonimidoyl dichloride (1) with dibenzylamine, viz. N2-pentafluorophenyl-N1,N1-dibenzylchloroformamidine (4a) is a Z-isomer, whereas according to the concept of stereoelectronic control one might have expected a product with E-configuration. The heat of formation and the geometry of Z- and E isomer of N2-pentafluorophenyl-N1,N1-diethylchloroformamidine (4b) (the latter is a product of the reaction of 1 with diethylamine) were calculated with the semi-empirical MNDO method. The calculated geometry of (Z)-4b was found to be in a good agreement with the experimentally determined structure of 4a. The formation of (Z)-4b is more preferable energetically than that of (E)-4b; the calculated difference in the heats of formation is 2·8 kcal mol-1. Thermodynamic control of the reaction stereochemistry is proposed.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/poc.610060602

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6

Digitale Medien

Oriented purple membrane multilayers of halobacteria fabricated by langmuir-blodgett and electrophoretic sedimentation techniquesPresented at the Second International Symposium on Molecular Electronics and Biocomputers, Moscow, 11-18 September 1989. (1992)

Maximychev, A. V. ; Kholmansky, A. S. ; Levin, E. V. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Advanced Materials for Optics and Electronics 1 (1992), S. 105-115

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ISSN: 1057-9257

Schlagwort(e): Monolayers ; Langmuir-Blodgett technique ; Bacteriorhodopsin ; Halobacteria ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Organised films containing oriented patches of purple membranes and consisting of 15-75 layers and approximately 1000 layers were fabricated by the Langmuir-Blodgett and electrophoretic sedimentation techniques respectively. ‘Surface pressure vs. molecular area’ isotherms for monolayers of purple membranes suspended in hexane and deposited on the air/water interface were studied. Circular dichroism and absorption spectroscopy were used to investigate the effect of an organic solvent on the chromophore binding site in the purple membranes. Kinetic methods based on flash excitation were employed to determine the influence of the film deposition conditions on the photoelectric response of bacteriorhodopsin and on the M412 intermediate relaxation. Structural characteristics for multilayers prepared from water and hexane purple membrane suspensions were determined by low-angle X-ray scattering. The influence of the layer deposition conditions on the electrical, physical and photoelectrical properties of ordered structures containing bacteriorhodopsin is discussed.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/amo.860010302

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7

Digitale Medien

A model of molecular electronics based on the concept of conjugated lonic-hydrogen bond systems (1994)

Karasev, V. A. ; Luchinin, V. V. ; Stefanov, V. E.

New York, NY [u.a.] : Wiley-Blackwell

Advanced Materials for Optics and Electronics 4 (1994), S. 203-218

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ISSN: 1057-9257

Schlagwort(e): Conjugated ionic-hydrogen bond systems ; Biostructures ; Biomolecules ; Molecular electronics ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: A new model of lmolecular electronics is proposed as an alternative to the ‘soliton logic’ developed by Carter. The model is based on the principles of continuity of conjugated ionic-hydrogen bond systems (CIHBSs) in the construction of supramolecular structures and conjugation through the hydrogen bond in energy transduction. It is presumed that these principles are realized in biostructures. The Concept implies a symmetrica oligomeric organisation of supramolecular structures and an oscillatory mode of their functioning. The basic architecture and basic elements have been identified. The basic architecture is determined by periodic CIHBSs. The latter have been analysed in proteins, nucleoproteids and biomembranes. The basic elements contain groups capable of building in CIHBSs. Charge generators, valves and other basic elements contain groups capable of building in CIHBSs. Charge generators, valves and other basic elements have been distinguished among biomolecules. Oligomeric enzymes have been suggested as functional prototypes of molecular processors-multivibrators where CIHBSs form Feedback loops and Provide energy recuperation. Technologcal aspects of designing molecular electronic devices on CIHBS principles have been considered. The most challenging and complicated problem is the creation of supramolecular structures with properties which can be specified in advance. Synthesis of membrane two-dimensional active media capable of storing and processing information in the mode of parallel fluxes is suggested as the most promising route for the fabrication of biochips.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/amo.860040304

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8

Digitale Medien

Synthesis and structures of some diorganotin bis(hydroxamate)sDedicated to Dr F. E. Brinckman. (1994)

Petrosyan, V. S. ; Yashina, N. S. ; Sizova, T. V. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Applied Organometallic Chemistry 8 (1994), S. 11-17

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ISSN: 0268-2605

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Analysis of literature data on the antitumor activity of organotin compounds reveals that R2SnX2 and their complexes containing Sn—O, Sn—N or Sn—S bonds often exhibit biological activity, especially if such bonds are formed by means of intramolecular coordination. Furthermore, a wide range of biological activities, from fungicidal, bactericidal and antiseptic to psychotropic and antitumor, is found to be characteristic for some organic hydroxamic acids (N-acylhydroxylamines). From this point of view the diorgantion bis-hydroxamates in this paper are of particular interest as potential biologically active antitumor drugs. Di-n-butyltin bis(N-methyl-N-p-bromobenzoylhydroxylamine) is being screened for antitumor activity.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aoc.590080104

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9

Digitale Medien

Poly-C-vinyltetrazoles: A new type of polyacid (1993)

Annenkov, V. V. ; Kruglova, V.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1903-1906

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ISSN: 0887-624X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1993.080310729

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10

Digitale Medien

Thermal decomposition of glassy poly(di-t-butyl fumarate) as a topochemical reaction (1993)

Ermakov, I. V. ; Yashin, V. V. ; Litmanovich, A. D. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 395-401

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ISSN: 0887-624X

Schlagwort(e): poly(di-t-Butyl fumarate) ; thermal decomposition ; kinetics ; autocatalysis ; solid-phase reaction mechanism ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Decomposition of t-butyl carboxylate (TBC) groups in a glassy poly(di-t-butyl fumarate) (PDTBF) at 140-170°C proceeds with a sharp acceleration caused by interchain interaction of TBC and carboxylic groups. According to selective dissolution data, at 70% degree of conversion the reaction system contains both unchanged PDTBF and a final product: poly(fumaric acid). For TBC groups decomposition in di-t-butyl fumarate (DTBF)-styrene copolymers above their Tg an apparent rate constant of autocatalysis increases with the increase of DTBF content in copolymer. Together with previously obtained x-ray data these results lead to conclusions about the topochemical character of the PDTBF decomposition. The mechanism suggested includes thermal decomposition of TBC groups (initiation), autocatalytic growth of spheric clusters up to a critical size (an appearance of primary germs of the new phase), and growth and branching of thread-like germs. A mathematical model based on these assumptions describes quantitatively the kinetic data. © 1993 John Wiley & Sons, Inc.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1993.080310212

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