Influence of curative, filler, compatibilizer, domain size, and blend ratio on the dynamic mechanical properties of silicone–EPDM blends

Kole, S.; Bhattacharya, Amitabha; Tripathy, D. K.; Bhowmick, Anil K.

doi:10.1002/app.1993.070480317

Cited by 31 publications

(19 citation statements)

References 11 publications

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“…Mastomatteo et al20 also have reported on this kind of migration of crosslinking ingredient into one of the phases of ethylene‐propylene‐diene rubber (EPDM)/styrene‐butadiene rubber (SBR) blend because of the difference in polarity. We observed a similar migration of curatives for many other blends 21, 22. Hence, using Diak #1 alone as a curative for a blend containing ACM‐FKM is not sufficient.…”

Section: Resultssupporting

confidence: 77%

Acrylic rubber‐fluorocarbon rubber miscible blends: Effect of curatives and fillers on cure, mechanical, aging, and swelling properties

Kader

Bhowmick

2003

J of Applied Polymer Sci

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The cure characteristics and mechanical properties of gum and filled acrylic rubber (ACM), fluorocarbon rubber (FKM), and their blends of varying compositions were studied both under unaged and aged conditions. The rheometric study showed that optimum cure properties were obtained using a mixed curing system of blocked diamine, hexamethylenediamine carbamate (Diak #1), and ammonium benzoate. From varying the curing agents, the optimum levels of Diak #1 and ammonium benzoate were found to be 1.5 and 2.5 phr, respectively. The addition of different fillers and their loading influenced the cure properties, with increased torque and reduced scorch safety. The gum and filled 50:50 (w/w) ACM-FKM showed overall performance in strength properties. Postcuring improved the strength of all the systems, especially the systems with a higher proportion of FKM. None of the properties changed significantly during aging of the blends. FKM and the blends containing a higher proportion of FKM were affected least by aging. Swelling of the blends was reduced by the addition of fillers. Dynamic mechanical thermal analysis showed a single tan ␦ peak corresponding to a single phase transition for both cured and filled blends. The storage modulus of the blend increased from the gum blend to the filled blend, indicating the presence of polymer-filler interaction.

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Section: Resultssupporting

confidence: 77%

Acrylic rubber‐fluorocarbon rubber miscible blends: Effect of curatives and fillers on cure, mechanical, aging, and swelling properties

Kader

Bhowmick

2003

J of Applied Polymer Sci

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“…11(a)], and (b)], the various phases preserve their peaks, as is typical of immiscible blends; 30 however, the peak magnitudes are reduced, corresponding to the phase content within the blend. The T g peaks of UHMWPE and polybutadiene remain unshifted at Ϫ110 and Ϫ70°C, respectively, and decrease significantly in magnitude upon the addition of 4 phr CB, again due to damping imposed by the filler.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 98%

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

Breuer

Tzur

Narkis

et al. 1999

J. Appl. Polym. Sci.

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CB-containing HIPS/UHMWPE and HIPS/XL-UHMWPE are unique systems, in which structuring takes place, affecting the electrical (to be described in a future article), rheological, mechanical, and dynamical-mechanical properties. The XL-UHMWPE particles have undergone structural fixation due to the crosslinking, maintaining their porosity and internal intricate structure even after high-temperature melt processing, as opposed to the UHMWPE particles. Differences in the flow mechanisms of HIPS/UHMWPE and HIPS/XL-UHMWPE blends have been attributed to polymer viscous flow in the former case vs. particle slippage in the latter. The mechanical properties of HIPS/UHMWPE are enhanced when utilizing XL-UHMWPE as a dispersed phase, especially the strength, because of changes in the inherent properties of the UHMWPE following irradiation, and in particular, the nature of the HIPS/XL-UHMWPE interface. The results for the CB-containing 70HIPS/30XL-UHMWPE blend are especially surprising and of practical importance, due to the fact that no degradation of the mechanical properties has occurred as a result of the CB incorporation. The dynamical mechanical properties reflect the differences between the UHMWPE and XL-UHMWPE-containing blends as well. The presence of either type of UHMWPE, CB content, and blend composition affect the dissipation, but have only a minor influence on the transition temperatures of the components. Of special interest is the increased damping of XL-UHMWPE-containing compositions.

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“…The literature shows that when we add ground rubber as filler the result is often a substantial deterioration in the physical properties of the composites. The deterioration is due to a lack of interfacial interaction between the particles of rubber waste and rubber matrix, mainly reclaiming a high concentration of waste 19–22…”

Section: Introductionmentioning

confidence: 99%

Use of EPDMSDD as compatibilizer agent for EPDM/EPDMR blends: Rheologic, mechanical, and morphologic properties

Santos

Carmo

Rezende

et al. 2011

J of Applied Polymer Sci

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Around the world, concern is growing about the amount of waste rubber going into landfills. Policymakers are encouraging researchers to find innovative ways to recycle this waste. In this study, as part of an effort to recycle waste rubber (EPDMR) as filler in compositions of EPDM, we prepare a terpolymer of ethylenepropylene-diene with 1-dodecanethiol (EPDMSDD). We use it as a compatibilizing agent to improve adhesion and incorporation of the residue (EPDMR) in EPDM/EPDMR blends. We synthesize and characterize EPDMSDD through 13 C-NMR and FTIR spectroscopy. We evaluate the effect of the compatibilizer EPDMSDD using vulcanization parameters, such as optimum cure time, scorch time, and torque. To evaluate its effect on the interaction between EPDMSDD/EPDMR, we carried out mechanical tests of samples with and without EPDMSDD. Our findings show that the tensile strength and elongation increased with the addition of EPDMSDD, indicating a better interaction between EPDMR/EPDM. Tear strength also increased with the presence of EPDMSDD, particularly for the amount of 70 and 80 phr of EPDMR. This suggests a good adhesion between the phases in high amounts of waste. The micrographs of the mixtures revealed that the addition of EPDMSDD improved the dispersion of the EPDMR in the EPDM phase.

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Influence of curative, filler, compatibilizer, domain size, and blend ratio on the dynamic mechanical properties of silicone–EPDM blends

Cited by 31 publications

References 11 publications

Acrylic rubber‐fluorocarbon rubber miscible blends: Effect of curatives and fillers on cure, mechanical, aging, and swelling properties

Acrylic rubber‐fluorocarbon rubber miscible blends: Effect of curatives and fillers on cure, mechanical, aging, and swelling properties

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

Use of EPDMSDD as compatibilizer agent for EPDM/EPDMR blends: Rheologic, mechanical, and morphologic properties

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