Elastic and viscoelastic behavior of ethylene–propylene copolymers

Candia, F. De; Vittoria, Vittoria

doi:10.1002/app.1973.070171101

J of Applied Polymer Sci

1973

DOI: 10.1002/app.1973.070171101

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Elastic and viscoelastic behavior of ethylene–propylene copolymers

F. De Candia¹,

Vittoria Vittoria²

Abstract: synopsisThe viscoelastic behavior of an ethylene-propylene copolymer is analyzed. Two different vulcanization procedures were followed; in the first a binary mixture of initiatorpolymer was used, while in the second the polymer was diluted by a solvent. The neb works thus obtained show a different viscoelastic behavior depending on the different vulcanization procedure used. Results, analyzed in terms of supramolecular organization being present in the amorphous material, give some important information about … Show more

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Cited by 15 publications

References 14 publications

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The relationship between rheology, morphology and physical properties in heterogeneous blends

Nelson¹,

Avgeropoulos²,

Weissert³

et al. 1977

Angew. Makromol. Chem.

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The morphology of heterogeneous blends of polybutadiene (PBD) and EPDM was selectively varied by a change of either the rheology of the blend components during mixing or of the blend composition. Under a given set of mixing conditions, the blend system approaches a "steady state morphology", which was found to be relatively independent of sample history. However, during subsequent compression molding, the morphology of the sample may be altered substantially with phase inversion occurring in some cases. A mechanism is proposed for the observed rheology-morphology behavior.The strain moduli of the vulcanizates prepared by irradiation of the elastomer blends were similar to those predicted using the parallel Takayanagi models. A positive synergism with respect to energy to break and stress at break was noted particularly in cases where the blend components showed a significantly different mechanical response. The sensitivity of the stress-strain response of these blends to changes in morphology was less than anticipated. This is attributed to restrictions imposed on the movement of the softer phase by the hard phase component of the blend. ZUSAMMENFASSUNG:Die Morphologie heterogener Polymermischungen aus Polybutadien (PBD) und Athylen-Propylen-Dien-Terpolymeren (EPDM) wurde selektiv variiert, indem entweder die Rheologie der Mischungskomponenten wahrend der Mischung oder die Zusammensetzung der Mischung geandert wurden. Bei gegebenen Mischungsbedingungen nahert sich das Mischungssystem einer ,,Steady-State-Morphologie", die sich als relativ unabhangig * Paper presented at the joint meeting of the GDCh-Fachgruppe "Makromolekulare Chemie" and the FachausschuR "Physik der Hochpolymeren" of the Deutsche Physikalische Gesellschaft on "Multiphase Polymer Systems" in Bad Nauheim (Germany) on March 30th 1976. jedoch die Morphologie wesentlich andern, wobei in einigen Fallen Phasenumwandlung eintritt. Fur das rheologisch-morphologische Verhalten wird ein Mechanismus vorgeschlagen.Die Dehnungsmoduln der durch Bestrahlung der Elastomermischungen hergestellten Vulkanisate glichen denjenigen, die durch die Takayanagi-Modelle vorausgesagt wurden. Ein positiver Synergismus hinsichtlich der Bruchenergie und der Zugspannung beim Bruch wurde speziell in den Fallen beobachtet, in denen die Mischungskoponenten ein ausgesprochen unterschiedliches mechanisches Verhalten zeigten. Die Empfindlichkeit des Zug-Dehnungsverhaltens dieser Mischungen bezuglich der hderungen in der Morphologie erwies sich geringer als vorher angenommen. Dies wird auf Einschrankungen in der Bewegungsmoglichkeit der weicheren durch die harte Phase in der Mischung zuruckgefuhrt.

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The relationship between rheology, morphology and physical properties in heterogeneous blends

Nelson¹,

Avgeropoulos²,

Weissert³

et al. 1977

Angew. Makromol. Chem.

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Structure–property relationships in crosslinked networks from cis‐1,4‐polybutadiene and methacrylic acid. Swelling behavior

Candia¹,

Taglialatela²,

Vittoria³

1976

J of Applied Polymer Sci

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SynopsisIn the present paper, we report results obtained analyzing the swelling behavior of a composite system prepared from vulcanizing mixtures of cis-polybutadiene and methacrylic acid with different amounts of acid. Two solvents were used as swelling agents, decalin and the N,N-dimethylformamide. The structural data, given by low-angle x-ray diffusion spectra, were used to interpret the mechanical behavior described in terms of the Mooney-Rivlin equation and hysteresis loops. Structural and mechanical data give information about the swelling mechanism of the solvents and about the problem of the experimental deviations from the Gaussian theory of rubber elasticity.

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Aspects of the thermal and dynamic mechanical behavior of EPDM rubbers

Byrne

Hourston

1979

J of Applied Polymer Sci

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Elastic and viscoelastic behavior of ethylene–propylene copolymers

Cited by 15 publications

References 14 publications

The relationship between rheology, morphology and physical properties in heterogeneous blends

The relationship between rheology, morphology and physical properties in heterogeneous blends

Structure–property relationships in crosslinked networks from cis‐1,4‐polybutadiene and methacrylic acid. Swelling behavior

Aspects of the thermal and dynamic mechanical behavior of EPDM rubbers

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