Micromechanics of cyclic softening in thermoplastic vulcanizates

Boyce, Mary C.; Yeh, Oscar C.; Socrate, Simona; Kear, K.L.; Shaw, Karla

doi:10.1016/s0022-5096(00)00077-6

Cited by 43 publications

(20 citation statements)

References 8 publications

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“…The hysteresis loop of cyclic tensile curves of 50/50 rubber/plastic blend ratio of uncrosslinked and dynamically crosslinked blends at constant strain of 100% are shown in Figures 5a and 5b. During stretching, a 50:50 blend ratio of PP and rubbery components exhibit the stress-strain behavior, a characteristic feature of a thermoplastic material: an initial linear elastic behavior followed by gradual yielding [30]. Compared to uncrosslinked blends, TPVs exhibit steady strain hardening effect immediately after yielding.…”

Section: Hysteresismentioning

confidence: 99%

Interrelationships of morphology, thermal and mechanical properties in uncrosslinked and dynamically crosslinked PP/EOC and PP/EPDM blends

Babu¹,

Singha²,

Naskar³

2010

Express Polym. Lett.

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Abstract. Thermoplastic vulcanizates (TPVs) based on polypropylene (PP) with ethylene octene copolymer (EOC) and ethylene propylene diene rubber (EPDM) have been developed by coagent assisted dicumyl peroxide crosslinking system. The study was pursued to explore the influence of two dissimilar polyolefin polymers (EOC and EPDM) having different molecular architectures on the state and mode of dispersion of the blend components and their effects with special reference to morphological, thermal and mechanical characteristics. The effects of dynamic crosslinking of the PP/EOC and PP/EPDM have been compared by varying the concentration of crosslinking agent and ratio of blend components. The results suggested that the uncrosslinked and dynamically crosslinked blends of PP/EOC exhibit superior mechanical properties over PP/EPDM blends. From the hystersis experiments it was found that PP/EOC blends also perform better fatigue properties over PP/EPDM based blends. It was demonstrated that, the origin of the improved mechanical properties of EOC based blends is due to the combined effect of the unique molecular architecture with the presence of smaller crystals and better interfacial interaction of EOC phase with PP as supported by the results of thermal and fatigue analyses.

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Section: Hysteresismentioning

confidence: 99%

Interrelationships of morphology, thermal and mechanical properties in uncrosslinked and dynamically crosslinked PP/EOC and PP/EPDM blends

Babu¹,

Singha²,

Naskar³

2010

Express Polym. Lett.

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“…But it should be noted that the rate of relaxation was different. Stress relaxation test is often used as a simple and fast method to character the viscoelastic response of polymeric materials . The fast relaxation rate indicated that the viscous nature of the material was higher relative to its elastic nature.…”

Section: Resultsmentioning

confidence: 99%

Preparation and properties of novel fluorosilicone thermoplastic vulcanizate with cross‐linking–controlled core‐shell structure

Wang

Tang

Ren

et al. 2019

Polymers for Advanced Techs

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A new fluorosilicone thermoplastic vulcanizate (TPV) composed of poly(vinylidene fluoride) (PVDF), silicone rubber (SR), and fluororubber (FKM) was successfully prepared through dynamic vulcanization. The morphological structure of the TPVs had core‐shell elastomer particles dispersed in a continuous PVDF matrix. Furthermore, the cross‐linking of core‐shell structure was controlled by adopting different curing agent. The effect of cross‐linking–controlled core‐shell structure on the morphology, crystallization behavior, stress relaxation test, solvent‐resistant properties of the obtained TPVs were investigated. It was found that the shell cross‐link had a significant influence on the crystallinity of the PVDF phase. The core‐shell bicross‐linked TPV was found to provide the lowest rate of relaxation. An obvious stress softening phenomenon was observed in the uniaxial loading‐unloading cycles in tension. The bicross‐linked TPV had good solvent resistant properties. The tensile strength of the bicross‐linked TPV was still 12 MPa even after immersed in butyl acetate for 48 hours.

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“…This is actually due to the entropy effect depicted by the typical macromolecules [11]. Thereafter, at higher temperatures, the relaxation phenomena overcompensates the entropy effect and leads to the wrinkling and buckling of the elastically undeformable thermoplastic chains with the additional retraction of the rubber phase [31,32] (Fig. 7).…”

Section: Estimation Of Rubber-like Behaviour From Tssr Measurementsmentioning

confidence: 98%

Theoretical and morphological evaluation of dynamic viscoelasticity and thermo-mechanical characteristics of TPV composites

Dey

Naskar

Nando

2015

Polymer

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Micromechanics of cyclic softening in thermoplastic vulcanizates

Cited by 43 publications

References 8 publications

Interrelationships of morphology, thermal and mechanical properties in uncrosslinked and dynamically crosslinked PP/EOC and PP/EPDM blends

Interrelationships of morphology, thermal and mechanical properties in uncrosslinked and dynamically crosslinked PP/EOC and PP/EPDM blends

Preparation and properties of novel fluorosilicone thermoplastic vulcanizate with cross‐linking–controlled core‐shell structure

Theoretical and morphological evaluation of dynamic viscoelasticity and thermo-mechanical characteristics of TPV composites

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