A Novel Approach to Investigating Effect of Sulfur as a Coagent on the Quasi‐Static and Cyclic–Dynamic Fatigue Properties of Peroxide Cured EPDM

Zou, Huimin; Gui-xue, Qiu; Liu, Guangyong; Soddemann, Matthias; Xu, Jiayong

doi:10.1002/pen.25300

Cited by 8 publications

(6 citation statements)

References 38 publications

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“…15 Several mechanisms have been suggested to explain this effect and the most accepted one is the increase in tensile strength due to the greater mobility of polysulfidic bonds. 35 As reported by other studies, 36,37 the EP formulation showed the lowest tensile strength values compared to vulcanized systems with sulfur. This is attributed to the lower energy required to break peroxide-vulcanized rubber.…”

Section: Mechanical Propertiessupporting

confidence: 58%

Influence of the curing system on the physical-mechanical, dynamic properties, and aging resistance of ethylene–propylene–diene monomer formulations for applications at high temperatures

Hermenegildo

Guerra

Giovanela

et al. 2021

Journal of Elastomers & Plastics

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The effects of three curing systems on rheometric, morphological, physical-mechanical, thermal, and dynamic properties of ethylene–propylene–diene monomer (EPDM) composites was investigated. The influence of thermo-oxidative aging on crosslink density and physical-mechanical properties was studied. Based on a standard composition for application at high temperatures, EPDM formulations with semi-efficient vulcanization systems (ES), efficient vulcanization systems (ED), and peroxide curing systems (EP) were prepared. Experimental results indicated that EPDM compounds cured with efficient vulcanization systems exhibit the highest scorch time with an intermediate maximum torque value at 150°C. The filler dispersion in the elastomeric matrix was greater than 94%; however, the ED formulation showed a more pronounced decrease, with the increase in deformation indicating a greater filler–filler interaction. In comparison with those cured with peroxide and semi-efficient systems, EPDM formulations cured with an efficient system presented better thermal resistance and the crosslink density was sufficient to maintain the mechanical integrity, leading to an intermediate hardness value, tensile strength, modulus, and greater elongation at breaking. In summary, the results indicated that the efficient curing system was the most appropriate to be used in the envelope’s manufacture, due to the better performance of the mechanical properties associated with the better resistance to thermal aging.

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Section: Mechanical Propertiessupporting

confidence: 58%

Influence of the curing system on the physical-mechanical, dynamic properties, and aging resistance of ethylene–propylene–diene monomer formulations for applications at high temperatures

Hermenegildo

Guerra

Giovanela

et al. 2021

Journal of Elastomers & Plastics

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“…Formation of crystallite zones near the crack tip results in branching of crack path along with the formation of micro‐cracks which triggers deviation from original crack path. [ 24 ] This deviation increases with ENR mol%. Formation of more deviated cracks stipulates the improvement of fracture resistance of ENR‐containing compounds.…”

Section: Resultsmentioning

confidence: 99%

Tear fatigue behavior of lignin‐based sustainable rubber composites

Chowdhury

Ghosh

Chanda

et al. 2022

Polymer Engineering & Sci

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Rubber products, especially tire, experiences millions of fatigue cycles during their service life. In this period, penetration or cuts owing to any sharp objects brings calamitous failure. Thus, the fatigue crack growth (FCG) characteristic of tire components has become an important parameter to inspect. In the present study, the FCG behavior of sustainable filler, lignin‐filled composite is investigated. The impact of rubber matrix (epoxidation of natural rubber) on crack growth behavior is scrutinized in this article. Epoxy group introduction in natural rubber leads to a significant change in tearing energy throughout the strain range (10%–25%). Higher mol% of the epoxy group brings in a lower crack growth rate. An increase in polar interaction amongst the matrix through epoxide—hydroxyl functionality contributes significantly to the FCG rate. Inter‐molecular interaction promotes higher cross‐link density in epoxidized natural rubber containing composites which are reflected in static as well as dynamic‐mechanical properties. Morphological evidence (Field‐emission scanning electron microscope [FE‐SEM] and microscopic images) establishes the fact that stiffening at the crack tip, arising from intrinsic strain‐induced crystallization and high‐density network formation in the concerned matrix are the major contributors to the reduction in fatigue crack growth rate of a composite.

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“…For Figure 4B, further investigation has been made to correlate ( M H − M L ) with ν e value, and a linear relationship has been quantitatively obtained as follows,

[M_{normalH} - M_{normalL}] = 1.6 \times ν_{normale} + 0.23 R^{2} = 0.9282 .

One intercept value of ( M H − M L ) being 0.23 dNm has been obtained by extrapolating ν e to zero, indicating that the physical entanglement brings an initial torque. The initial torque is so low because the carbon black is difficult to disperse to increase the physical crosslinks through the rubber–filler interactions 19 …”

Section: Resultsmentioning

confidence: 99%

“…The initial torque is so low because the carbon black is difficult to disperse to increase the physical crosslinks through the rubber-filler interactions. 19…”

Section: Crosslink Densitymentioning

confidence: 99%

A new way to investigate the damping properties of NR/CIIR blends characterized by the rebound behaviors

Shi

Yuan

Guo

et al. 2022

Polymers for Advanced Techs

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In this work, effects of natural rubber (NR) content on the vulcanization and damping properties of chlorinated butyl rubber (CIIR) were studied. A new method to characterize the damping performance of the NR/CIIR blends by the rebound behavior of rubber ball was proposed. And an optical laser-based measurement was used to follow the movement of the rubber sample. The DMA results showed that better damping properties of the blends was obtained at higher proportion of CIIR in the blends at room temperature (20 C) and a frequency of 0.1-100 Hz. Furthermore, a propose

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A Novel Approach to Investigating Effect of Sulfur as a Coagent on the Quasi‐Static and Cyclic–Dynamic Fatigue Properties of Peroxide Cured EPDM

Cited by 8 publications

References 38 publications

Influence of the curing system on the physical-mechanical, dynamic properties, and aging resistance of ethylene–propylene–diene monomer formulations for applications at high temperatures

Influence of the curing system on the physical-mechanical, dynamic properties, and aging resistance of ethylene–propylene–diene monomer formulations for applications at high temperatures

Tear fatigue behavior of lignin‐based sustainable rubber composites

A new way to investigate the damping properties of NR/CIIR blends characterized by the rebound behaviors

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