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  • 1
    Electronic Resource
    Electronic Resource
    Selektivitätsuntersuchungen an einer zweischichtenfraktionierung von polyäthylenterephthalatKurzreferat vgl. Abstract E 6, III. Microsymposium Prague 1968.Auszugsweise vorgetragen auf der 9. Chemiefasertagung in Tabor/CSSR, 18.3.69. (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 7 (1969), S. 110-120 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The concentration dependence of the selectivity in fractionation experiments with polyethylene terephthalate has been investigated. The values obtained with 0.25% solutions showed close approximation to the SCHULZ-FLORY distribution. Lowering the concentration resulted in an essential increase of efficiency. Almost quantitative fractionation was achieved with various model blends of polyethylene terephthalate samples having different molecular weight.
    Notes: Es wurde die Konzentrationsabhängigkeit der Selektivität der Fraktionierung von Polyäthylenterephthalat untersucht. Die Fraktionierung aus 0,25-proz. Ausgangslösung ergab nahezu Kongruenz zwischen Experimentalkurve und SCHULZFLORY-Kurve. Durch die Konzentrationserniedrigung konnte die Rationalität wesentlich verbessert werden. Verschiedene Modellmischungen von Polyäthylenterephthalaten unterschiedlicher Molmasse konnten nahezu quantitativ getrennt werden.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1969.050070110
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Modellierung der diskontinuierlichen schmelzepolykondensation von polyethylenterephthalat (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 116 (1983), S. 109-124 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: For a four-paramter reaction-mass transfer-model of the melt polycondensation the constants of polycondensation, thermolysis and diffusion were determined by means of experiments in thin layer polycondensation. Based on these constants the convectional mass transfer or efficient melt thickness in polycondensation systems under the conditions of compelled mixing can be estimated. This way of combining micro- with macrokinetics was tested experimentally in a 10 1 reactor with anchor agitator.
    Notes: Für ein vierparametriges Reaktions-Stofftransport-Modell der Schmelzepolykondensation wurden durch Polykondensationsversuche in dünner Schicht die Konstanten für Polykondensation, Thermolyse und Diffusion bestimmt. Mit diesen mikrokinetischen Konstanten lassen sich dann konvektiver Stofftransport bzw. effektive Schichtdicken in zwangsdurchmischten Polykondensationssystemen ermitteln. Dieser Weg der Kombination von Mikro- und Makrokinetik wurde experimentell in einem 10 1 Laborreaktor mit Ankerrührer überprüft.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051160109
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  • 3
    Electronic Resource
    Electronic Resource
    Zur diffusion in polyesterschmelzen (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 119 (1983), S. 137-146 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The diffusion coefficients of 1,2-dichloroethane and 1,4-dichlorobutane in poly(alkyleneterephthalate) melts were determined with a quartz spring sorption apparatus. Dichloroalkanes show in the polyester melts similar behaviour as alkane diols. In the range of small diffusant concentrations the diffusion coefficients are independent of melt viscosity.
    Notes: Mittels Sorptionsmessungen an einer McBainschen Waage wurden die Diffusionskoeffizienten von 1,2-Dichlorethan und 1,4-Dichlorbutan in Polyalkylenterephthalatschmelzen bestimmt. Dichloralkane weisen in Polyesterschmelzen ähnliches Diffusionsverhalten wie Alkandiole auf. Im Bereich niedriger Diffusantkonzentration sind die Diffusionskoeffizienten viskositätsunabhägig.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051190110
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Reaction calorimetric investigation of the ring-opening polymerization of ε-caprolactone (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 229 (1995), S. 199-208 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die ringöffnende Polymerisation von ε-Caprolacton wurde mittels eines Mettler RC1 Reaktionskalorimeters untersucht. Im Bereich kleiner und mittlerer Monomerumsätze ist diese Methode erfolgreich für die Bestimmung des Verlaufs von Massepolymerisationen zu verwenden. Die durch kalorimetrische und gravimetrische Methoden ermittelten Ergebnisse wurden verglichen und der Verlauf der Polymerisation in Abhängigkeit von Reaktionsparametern (Initiator, Temperatur) diskutiert.
    Notes: The ring-opening polymerization of ε-caprolactone was investigated by means of the Mettler RC1 reaction calorimeter. In the range of small and medium monomer conversions this method can successfully be used for the determination of the course of the bulk polymerizations. The experimental results obtained by calorimetric and gravimetric method, respectively, are compared and the course of the polymerization is discussed in dependence on the reaction parameters (initiator, temperature).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1995.052290114
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  • 5
    Electronic Resource
    Electronic Resource
    13C NMR spectroscopical sequence analysis of poly(ethylene terephthalate-co-oxybenzoate)s (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 3173-3183 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The sequence distribution of liquid-crystalline poly(ethylene terephthalate-co-oxybenzoate)s was determined by 13C NMR spectroscopical investigations of samples with different compositions. All possible oxybenzoate- and terephthalate-centered triads could be identified and assigned. The analysis of NMR substituent effects confirms the assignment. The comparison of the calculated statistical with the experimentally determined triad distribution shows a tendency for the formation of oxybenzoate blocks in the polymer chain.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021901215
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