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  • 1
    Electronic Resource
    Electronic Resource
    Anwendbarkeit der Gelpermeationschromatographie-Methode zur Bestimmung der Molekülmassenverteilung von Polyorganosiloxanen (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 1095-1095 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01382422
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  • 2
    Electronic Resource
    Electronic Resource
    General features of the reaction of 4,4′-difluorobenzophenone with potassium diphenoxide of 2,2-bis (4-hydroxyphenyl)propane (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 2397-2401 
    Details
    ISSN: 1573-9171
    Keywords: 4,4′-difluorobenzophenone ; dipotassium diphenoxide of 2,2-bis(4-hydroxyphenyl)propane ; nucleophilic substitution of activated aryl halides ; polycondensation ; polyarylene-ether ketones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The major factors determining molecular weights of polyarylene-ether ketones formed by the reaction of 4,4′-difluorobenzophenone with 2,2-bis(4-hydroxyphenyl)propane in the presence of K2CO3 were revealed. The optimum conditions for the preparation of high-molecular-weight polymers were found, and it was demonstrated that it is possible to control their molecular weights ( $$\bar M_W $$ from 10 000 to 200 000).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435391
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  • 3
    Electronic Resource
    Electronic Resource
    A study of the thermal and hydrolytic stability of a number of heterocyclic compounds modelling “ladder-like” polyheteroarylenes (1977)
    Springer
    Russian chemical bulletin 26 (1977), S. 1276-1281 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. The thermal and hydrolytic stability of compounds modelling some “ladder-like” polyhetero-arylenes has been studied in the temperature range from 250 to 550°C. 2. Compounds with benzoylenebenzimidazole rings decompose by two competing mechanisms — homolytic and heterolytic. The decomposition of compositions containing naphthoylenebenzimidazole and benzimidazoloquinazoline rings is determined mainly by radical decomposition reactions. 3. Heterocyclic systems containing s-triazole rings are thermally less stable than systems based on benzimidazole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01143919
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  • 4
    Electronic Resource
    Electronic Resource
    On the flexibility of cyclochain polymers (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1725-1757 
    Details
    ISSN: 0887-6266
    Keywords: conformational parameters ; cyclochain polymers ; flexibility ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Conformational parameters for a wide variety of aromatic cyclochain polymers have been computed assuming free rotation about virtual bonds. The flexibility with free rotation is shown to be determined by the geometry of the repeat unit and can vary over a wide range (15-1500 Å). Experimental values of the Kuhn segment length A are calculated from literature data on the hydrodynamic behavior of polymeric macromolecules of this class in solution. For most polymers Afr for free rotation is equal to the experimental Aexp, and hindered rotation is mainly due to bulky substituents. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311208
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  • 5
    Electronic Resource
    Electronic Resource
    Dependence of the conformational parameters of polyimides on the chemical structure of the chain (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 1175-1186 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The flexibility of some polyimide chains has been studied theoretically as a function of the chemical structure of the repeat unit. It has been shown that the thermodynamic flexibility can be varied over a wide range by the choice of the unit structure. For three polyimides, as an example, the flexibility of cyclochain structures approximates that for free rotation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180180602
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  • 6
    Electronic Resource
    Electronic Resource
    Peculiarities of degradation processes of carborane-containing polyamides. Review (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 61-74 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es werden Fragen des Abbaus von Polyamiden unterschiedlichen chemischen Baus mit m-, o- und p-Carborangliedern sowie ihrer Modellverbindungen im Vakuum, in Sauerstoffatmosphäre und in Wasserdampf sowohl bei hohen als auch bei relativ niedrigen Temperaturen behandelt. Ein Abbaumechanismus für die carboranhaltigen Polyamide wird in Form von hetero- und homolytischen Reaktionen vorgeschlagen.
    Notes: Degradation of m-, o- and p-carborane-containing polyamides of different chemical structures as well as their model compounds in vacuum, in oxygen medium and saturated water vapour both at high and relatively low temperatures is studied. A mechanism for degrading the carborane-containing polyamides occuring both in heterolytic and in homolytic reactions is proposed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320201
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Molmassenverteilung aromatischer Polyamide aus Dispersionspolykondensationen (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 144-149 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: By sedimentation analysis the molecular weight distribution (MWD) of poly-m-phenylene-iso-(70)-co-tere(30)-phthalamides obtained under different conditions of reaction by dispersion polycondensation was investigated. The MWD was found to correspond to the normal distribution having the polydispersity coefficient of nearly 2, which is to be expected with condensation polymers. The MWD is not affected by the conditions of synthesis.
    Notes: Durch Sedimentationsanalysen wurde die Molmassenverteilung (MMV) von unter verschiedenen Reaktionsbedingungen durch Dispersionspolykondensation gewonnenen Poly-m-phenylen-iso(70)-co-tere(30)-phthalamiden untersucht. Es zeigte sich, daß die MMV einer für Kondensationspolymere zu erwartenden Normalverteilung mit Polydispersitätskoeffizienten nahe 2 entspricht. Die Synthesebedingungen haben keinen Einfluß auf die MMV.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340304
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  • 8
    Electronic Resource
    Electronic Resource
    Investigation of the hydrodynamic properties of chitosan solutions (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 420-424 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die hydrodynamischen Eigenschaften von Polymerhomologen des Chitosans wurden untersucht. Als Lösungsmittel wurden 2%ige Essigsäure mit 0,2 M Natriumacetat und Dichloressigsäure gleicher Ionenstärke verwendet. Die Parameter der Gleichungen wurden bestimmt, die die Grenzviskosität und den Sedimentationskoeffizienten des Polymers mit seiner Molekülmasse in Beziehung setzen. Einige Konformationsparameter des Chitosans wurden berechnet. Sie weisen auf eine erhöhte Permeabilität der makromolekularen Ketten in den untersuchten Lösungsmitteln hin.
    Notes: The hydrodynamic properties of solutions of polymer-homologous of chitosan are studied. The solvents used are 2% acetic acid with 0.2 M sodium acetate and dichloroacetic acid of equal ionic strength. The parameters of equations are determined relating the intrinsic viscosity and sedimentation coefficient to the molecular weight. The calculated conformational parameters of the polymer indicate high permeability of the macromolecular coils in the solvents used.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360805
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  • 9
    Electronic Resource
    Electronic Resource
    On the heterophase polycondensation model (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 76-78 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ein Modell der Heterophasen-Polykondensation wird vorgeschlagen, das den linearen, irreversiblen Polykondensationsprozeß mit Ausbildung einer flüssig-flüssig Phasentrennung beschreibt. Diese Version unterscheidet sich von einem früher vorgeschlagenen Model durch die realistischere Beschreibung des Beginns der Phasentrennung durch Wahl geeigneter Anfangskonzentrationen in der zweiten Phase. Differentialgleichungen werden abgeleitet und gelöst, die die Molekülmassen der Reaktionsprodukte mit kinetischen Konstanten und den Parametern der Phasentrennung verknüpfen. Früher erhaltene Ergebnisse sind ein Spezialfall der vorliegenden Arbeit.
    Notes: A version of the heterophase polycondensation model is proposed which describes the linear irreversible polycondensation process involving liquid-liquid phase separation. This version distinguishes from the previous model by the more appropriate description of the beginning of phase separation by selection of suitable initial concentration in the second phase. Differential equations are obtained and solved connecting molecular mass characteristics of the reaction products with the kinetics constants and phase separation parameters. Previous results are a particular case of this concept.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370204
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of phase separation on molecular mass characteristics of linear polycondensation products (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 156-161 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Am Beispiel der Bildung von Poly(phenolphthalein-terephthalat) werden die Bedingungen ermittelt, bei denen die Polykondensation von einer Phasentrennung des flüssigen Reaktionsgemischs begleitet wird. Ferner wird die Kinetik des Prozesses für eine Reihe von Lösungsmittel/Fällungsmittel-Systemen und ihr Einfluß auf die Molmassenverteilung der Reaktionsprodukte untersucht, wozu ein früher vorgeschlagenes mathematisches Modell benutzt wird. Schließlich wird gezeigt, daß mit zunehmender Selektivität der Phasentrennung der Einfluß des Heterophasencharakters des Prozesses auf die Molmassenverteilung der Reaktionsprodukte größer wird.
    Notes: The conditions are determined, in which the formation of polyterephthalate of phenolphthalein is accompanied by the liquid-liquid phase separation of the reaction mixture. The kinetic parameters of the process and their connection with molecular mass characteristics of the reaction products are determined in some solvent-nonsolvent systems. A mathematical model obtained early by the authors is used. It was observed that with increasing phase separation selectivity the influence of heterogeneity of the process on the MMD of the products becomes stronger.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370307
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