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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of polymer networks by measurements of the freezing point depression (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 806-813 
    Details
    ISSN: 1435-1536
    Keywords: Freezingpointdepression ; junctionpointdistance ; distancedistribution ; heterogeneity ; rubbervulcanizates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Based on the phenomenon of freezing point depression of a solvent byΔT, experimental evidence is presented to show that the distance between the junction points can be calculated fromΔT. Direct measurements of the temperature-time-curve of the cooling network and the Differential Scanning Calorimetry offer the determination ofΔT. Except the mean distances ¯d c in dependence on cross-linking density, swelling degree, and other network parameters, the distribution of the distance between the junction pointsH(dc) can be determined, which allows conclusions on the course of cross-linking reaction. This paper attempts to give experimental evidence of influences of the breadth ofH(dc) on application-relevant properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410958
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  • 2
    Electronic Resource
    Electronic Resource
    Compression measurements on dry and swollen networks (1994)
    Springer
    Polymer bulletin 32 (1994), S. 103-109 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The elastic behavior (uniaxial compression measurements) of PDMS-networks swollen in pure solvents of different thermodynamic quality is described. The results are discussed in the framework of the model for phantom networks. It is shown that the calculated MC is a function of the swelling degree and that the corresponding curve consists of two different parts. The shape of the first part can be explained by a change of the microstructure factor A and the second by a change of the memory term η.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297421
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  • 3
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. XIX.XVIII: Acta Polymerica 32 (1981) 270.. Darstellung und Charakterisierung eines langkettenverzweigten Polyethylenmodells (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 564-568 
    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: Vinylchloride was grafted onto low-density polyethylene (PE-ND). The graft copolymer was characterized by light scattering. Dehalogenating dehydration resulted in polyethylene containing a defined higher number of long-chain branches than the backbone polyethylene of the graft copolymer. The intrinsic viscosity of the model polyethylene was determined at various values of molecular weight and contraction factors are calculated.
    Notes: Auf Polyethylen niederer Dichte (PE-ND) wurde Vinylchlorid aufgepfropft. Das Pfropfcopolymer wird durch Lichtstreuung charakterisiert. Nach dehalogenierender Hydrierung wird ein Polyethylen erhalten, das gegenüber dem Rückgratpolyethylen des Pfropfcopolymers eine um einen bekannten Wert erhöhte Zahl von langen Seitenästen enthält. Grenzviskositäten des Polyethylenmodells werden bei verschiedenen Molmassen bestimmt und Kontraktionsfaktoren berechnet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320909
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  • 4
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen des Lösungszustandes von Polyethylen mittels LichtstreuungsmessungenIX. Mitt. siehe Fasserforsch. u. Textiltechnik/Z. Polymer-forsch. 29 (1978) 521-525 (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 161-165 
    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: With fractinated and non-fractionated samples of polyethylene in various solvents at different temperatures the values of Mw, 〈r2〉z and A2 were determined. The increase of molecular weight on approaching the precipitation temperature and the second virial coefficient show that polyethylene is comparatively poorly dissolved and the big polymer molecules are of spherical shape.
    Notes: Von fraktionierten und unfraktionierten Polyethylenproben wurden in unterschiedlichen Lösungsmitteln und bei verschiedenen Temperaturen Mw, 〈r2〉z und A2 bestimmt. Die Molmassenzunahme bei Annäherung der Meßtemperatur an die Ausfälltemperatur und das Verhalten des 2. Virialkoeffizienten weisen aus, daß Polyethylen in einem schlechten Lösungszustand vorliegt und große Polymermoleküle kugelförmig sind.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300307
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  • 5
    Electronic Resource
    Electronic Resource
    DSC-Untersuchungen an ungequollenen und gequollenen vernetzten Polybutadienen (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 519-527 
    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: Transition phenomena in swollen and unswollen polymer networks are investigated by means of differential scanning calorimetry method. The transition temperatures and heats of 1,4-cis-polybutadiene with different degrees of crosslinking are discussed in relation to the structural parameters of the polymer network.
    Notes: Mit Hilfe der Differential-Scanning-Calorimetrie werden Umwandlungserscheinungen an gequollenen und ungequollenen polymeren Netzwerken untersucht. Die an unterschiedlich stark vernetzten 1,4-cis-Polybutadienen ermittelten Umwandlungstemperaturen und -wärmen werden in Relation zu den Strukturparametern der polymeren Netzwerke gesetzt und diskutiert.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380903
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  • 6
    Electronic Resource
    Electronic Resource
    Netzwerkcharakterisierung mittels Dampfdruckosmometer. I. Grundlagen der Methode (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 500-504 
    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: The activity of the solvent in a swollen polymer network is determined by means of a vapour pressure osmometer. The evaluation of the results based on the Flory-Rehner concept proves this method to be appropriate to determine simultaneously Mc and the Huggins interaction parameter χ for networks with Mc 〈 104 g·mol-1, but to determine only % and its concentration dependence for networks with Mc 〉 104 g·mol-1.
    Notes: Mit einem Dampfdruckosmometer wird die Aktivität des Lösungsmittels im gequollenen polymeren Netzwerk gemessen. Die Auswertung der Messung nach Flory und Rehner zeigt, daß mit der vorgestellten Methode für Netzwerke mit Mc 〈 104 g · mol-1 gleichzeitig Mc und der Hugginssche Wechselwirkungsparameter χ, für Netzwerke mit Mc 〉 104 g·mol-1 nur χ und dessen Konzentrationsabhängigkeit bestimmt werden können.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370807
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  • 7
    Electronic Resource
    Electronic Resource
    Netzwerkcharakterisierung mittels Dampfdruckosmometer. II. Der Hugginssche Wechselwirkungsparameter von vernetzten SystemenTeil I: siehe [1] (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 536-540 
    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: The concentration and temperature dependence of the Huggins interaction parameter of natural rubber crosslinked by sulfur, and 1,4-cis-polybutadiene samples crosslinked by electron and γ-irradiation in the solvents benzene, cyclohexane and dioxane is determined experimentally and discussed.
    Notes: Die Konzentrations- und Temperaturabhängigkeit des Hugginsschen Wechselwirkungsparameters von schwefelvernetzten Naturkautschukproben sowie elektronenstrahl- und γ-strahlenvernetzten 1,4-cis-Polybutadienproben in den Lösungsmitteln Benzen, Cyclohexan und Dioxan wird experimentell bestimmt und diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370902
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  • 8
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. XII. Lösungszustand und MolekülkontraktionXI. Mitt. siehe Aca Polymerica 30 (1979) 557-562 (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 21-25 
    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 literature data the molecular contraction, being a measure of long chain branching, was proved to depend on the thermodynamic state of disslution. By investigations on the state of dissolution of branched and linear polyethylene, molecule aggregates were found to be formed on approximating the precipitation temperature.
    Notes: Eine Analyse von Literaturdaten zeigt, daß die Molekülkontraktion, die als Meßgröße zur Bestimmung von Langkettenverzweigungen dient, u. a. auch vom thermodynamischen Lösungszustand abhängig ist. Aus der Untersuchung des Lösungszustandes von verzweigtem und linearem Polyethylen ergibt sich, daß bei Annäherung an die Ausfälltemperatur Molekülaggregate gebildet werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310104
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  • 9
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. XIII. Lichtstreuungs- und Viskositätsmessungen an PE-HD-Fraktionen bei verschiedenen TemperaturenXII. Mitt. siehe voranstehende Arbeit (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 26-30 
    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: Light scattering and viscosity measurements with PE-HD fractions in n-decane were carried out. Based on the dependence of the radius of gyration on the molecular weight the PE-HD molecules are suggested to contract. The experimental scattering function of the high molecular weight fraction corresponds to that of spherical particles. The lg [η]-lg Mw relationship shows no linearity but increases less with rising molecular weight and decreasing temperature.
    Notes: Lichtstreuungs- und Viskositätsmessungen von PE-HD-Fraktionen in n-Dekan wurden durchgeführt. Aus der Molmassenabhängigkeit des Trägheitsradius wird auf eine Kontraktion der PE-HD-Moleküle geschlossen. Die experimentelle Streufunktion hochmolekularer Fraktionen entspricht der von kugelförmigen Partikeln. Die lg [η]-lg Mw-Kurve ist nicht linear. Mit zunehmender Molmasse und abnehmender Temperature verläuft sie flacher.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310105
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  • 10
    Electronic Resource
    Electronic Resource
    Netzwerkcharakterisierung durch dampfdruckosmotische Messungen (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 56-57 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360111
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