The dynamic mechanical properties of oil-extended, carbon black-reinforced, and peroxide-crosslinked EPDM rubber

Byrne, L. F.; Hourston, D. J.

doi:10.1002/app.1979.070231007

Cited by 12 publications

(3 citation statements)

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“…This shows that EPDM/NBR is cross-linked and the interaction between the EPDM/NBR and the iPP has increased. Hourston and Byrne [30,31] investigated that the dynamic mechanical behavior of EPDM and reported that the tan δ max is increased by cross-linking which is shown with the decrease of the degree of crystallinity from 41.65 to 23.75 as the loading of EPDM/NBR content increases from 0 to 40 wt. % in the blend.…”

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 96%

RETRACTED ARTICLE: Investigation on the improvement of physico-mechnical, viscoelastic and morphological properties of isotactic polypropylene (iPP)/ethylene-propylene diene rubber (EPDM)/ nitrile rubber (NBR) elastomeric blends

Chauhan

Soni

Singh

2010

Int J Plast Technol

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An attempt has been made to study the mechanical, viscoelastic and morphological behavior of various dynamically cross-linked blends of isotactic polypropylene (iPP) with ethylene-propylene diene rubber (EPDM) and nitrile rubber (NBR) were examined and compared with these of uncross-linked blends of iPP/EPDM/NBR. These blends were prepared by melt blending in an internal mixer at 190°C in the composition range of 10-40 wt. % EPDM/NBR elastomeric content. The variation in the strength of fibrils of the craze, yield stress and the number density of the EPDM/NBR elastomeric domains (morphology) which are important factors for enhancing the interfacial adhesion and toughness in dynamically crosslinked blends were determined. The toughness and ductility of these blends were discussed with main emphasis on the composition between crack formation and the degree of plastic deformation through crazing and shear yielding. The physicomechanical properties such as hardness, impact strength, flexural strength and flexural modulus of dynamically cross-linked blends were found to be consistent and displayed enhanced mechanical properties values as compared with uncross-linked blends. The decreases in crystallinity and nucleation effect in cross-linked blends of iPP/EPDM/NBR were considered to contribute in the improvement in the impact strength behavior of the blends prepared.

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Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 96%

RETRACTED ARTICLE: Investigation on the improvement of physico-mechnical, viscoelastic and morphological properties of isotactic polypropylene (iPP)/ethylene-propylene diene rubber (EPDM)/ nitrile rubber (NBR) elastomeric blends

Chauhan

Soni

Singh

2010

Int J Plast Technol

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“…This indicates that the EPDM is crosslinked and the interaction between the EPDM and the PP has increased. Byrne and Hourston9, 10 investigated the dynamic mechanical behavior of EPDM and reported that the tan max is increased by crosslinking, which is ascribed to the decrease of the degree of crystallinity from 41.63 to 23.73 as the EPDM content increases from 0 to 40 wt % in the blend. The same phenomenon was observed by Coran and Patel 11.…”

Section: Resultsmentioning

confidence: 99%

Effect of dynamic crosslinking on impact strength and other mechanical properties of polypropylene/ethylene-propylene-diene rubber blends

Jain

Nagpal²,

Singhal³

et al. 2000

J. Appl. Polym. Sci.

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The deformation and fracture behavior of several dynamic vulcanizate blends of isotactic polypropylene with ethylene‐propylene‐diene rubber (EPDM) was examined and compared with those of uncrosslinked blends of PP/EPDM. These blends were prepared by melt mixing in an internal mixer at 190°C in a composition range of 10–40 wt % EPDM rubber. The variation in yield stress, the strength of fibrils of the craze, and the number density of the EPDM rubber domains (morphology fixation) that are dominant factors for enhancing interfacial adhesion and toughness in dynamic vulcanizate blends were evaluated. The ductility and toughness of these materials were explained in light of the composition between crack formation and the degree of plastic deformation through crazing and shear yielding. The physicomechanical properties including the hardness, yield stress, Young's modulus, percentage elongation, impact strength, flexural strength, and flexural modulus of dynamic vulcanized blends were found to be consistent and displayed higher values compared with uncrosslinked blends. The nucleation effect of the crosslinked particles and the decrease of crystallinity of the EPDM rubber were also considered to contribute to the improvement in the impact strength. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2089–2103, 2000

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“…Rinde and Hoge8, 9 constructed the master curve of dynamic shear modulus of polystyrene bead foams and solid polymer for different frequencies as well as for a wide range of temperatures. The linear elastic properties of microcellular plastics have been reported by Jackson et al10 Strain‐dependent dynamic mechanical properties of solid rubbers are reported by several workers,11–20 whereas very little work on closed cell microcellular rubbers has been investigated. The studies on the viscoelastic behaviors of closed cell microcellular ethylene–octene copolymer21–23 show that the storage modulus and tan δ (the ratio of loss modulus and storage modulus) are frequency‐ and temperature‐dependent, and the log of storage modulus bears a linear relationship with the log of density.…”

Section: Introductionmentioning

confidence: 94%

Dynamic mechanical properties of conductive carbon black‐reinforced closed cell microcellular oil‐extended EPDM rubber vulcanizates: Effect of blowing agent, temperature, frequency, and strain

Mahapatra¹,

Tripathy²

2006

J of Applied Polymer Sci

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Dynamic viscoelastic properties of Vulcan XC 72 (excess conductive carbon black)-reinforced solid-and closed-cell microcellular controlled long chain branching grade oil-extended EPDM (Keltan 7341A) rubber vulcanizates were studied at four frequencies of 3. 5, 11, 35, and 110 Hz, and at a temperature range of Ϫ100 to 160°C.The effect of blowing agent (ADC 21) loading on storage modulus (EЈ) and loss tangent (tan ␦) was studied. The log of storage modulus bears a linear relationship with the log of density for both solid and microcellular rubber. Relative storage modulus (EЈ f /EЈ s ) decreases with decrease in relative density ( f / s ). Both EЈ and tan ␦ were found to be dependent on frequency and temperature. The master curves of the storage modulus versus log temperature-reduced frequency were formed by superimposing EЈ results and by using shift factors calculated by Arrhenius equation. Strain-dependent isothermal dynamic viscoelastic properties were carried out for dynamic strain amplitude of 0.08 -7%. Cole-Cole plots of microcellular vulcanizates show a circular arc with blowing agent (density). Empirical relationship between tan ␦ versus EЈ is found to be linear, whose slope is independent of blowing agent loading or density.

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The dynamic mechanical properties of oil-extended, carbon black-reinforced, and peroxide-crosslinked EPDM rubber

Abstract: SynopsisThe effects of aromatic, naphthenic, and paraffinic oils on the dynamic mechanical behavior of an EPDM rubber (Nordel 1560) have been investigated as have the influences of oil level, carbon black loading, and peroxide crosslinking.

Cited by 12 publications

References 0 publications

RETRACTED ARTICLE: Investigation on the improvement of physico-mechnical, viscoelastic and morphological properties of isotactic polypropylene (iPP)/ethylene-propylene diene rubber (EPDM)/ nitrile rubber (NBR) elastomeric blends

RETRACTED ARTICLE: Investigation on the improvement of physico-mechnical, viscoelastic and morphological properties of isotactic polypropylene (iPP)/ethylene-propylene diene rubber (EPDM)/ nitrile rubber (NBR) elastomeric blends

Effect of dynamic crosslinking on impact strength and other mechanical properties of polypropylene/ethylene-propylene-diene rubber blends

Dynamic mechanical properties of conductive carbon black‐reinforced closed cell microcellular oil‐extended EPDM rubber vulcanizates: Effect of blowing agent, temperature, frequency, and strain

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