Studies on the influence of structurally different peroxides in polypropylene/ethylene alpha olefin thermoplastic vulcanizates (TPVs)

Babu, Ramesh; Singha, Nikhil K.; Naskar, Kinsuk

doi:10.3144/expresspolymlett.2008.27

Cited by 47 publications

(42 citation statements)

References 17 publications

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“…These results showed that the dynamic revulcanization improves the mechanical properties, as also observed by other authors [39,[45][46][47][48][49][50][51] . [46] studied the properties of the blends polypropylene (PP)/GTR devulcanized by ultrasound using different curing systems and processing routes, and all the blends presented low elongation at break.…”

Section: Mechanical Propertiessupporting

confidence: 89%

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

et al. 2015

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SbstractThe main objective of this work is the study of the influence of microwaves devulcanization of the elastomeric phase on dynamically revulcanized blends based on Ground Tire Rubber (GTR)/High Density Polyethylene (HDPE). The devulcanization of the GTR was performed in a system comprised of a conventional microwave oven adapted with a motorized stirring at a constant microwaves power and at various exposure times. The influence of the devulcanization process on the final properties of the blends was evaluated in terms of mechanical, viscoelastic, thermal and rheological properties. The morphology was also studied.

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Section: Mechanical Propertiessupporting

confidence: 89%

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

et al. 2015

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“…The samples of about 6 mg sealed in aluminum pans were heated from -80 to 200°C at a scanning rate of 10°C/min under nitrogen atmosphere. The degree of crystallinity of PP was determined from the heating curve by using standard formula which was discussed earlier by the authors [17,18]. Mechanical Testing -The dumb-bell shaped specimens of the TPV used for testing were die cut from the compression molded sheet and the testing was done after 24 hours of maturation at room temperature.…”

Section: Testing Proceduresmentioning

confidence: 99%

“…Lai et al [16] investigated the fracture behavior and physicomechanical properties of peroxide cured PP/EOC TPVs. As a part of the extensive research work on the peroxide cured PP/EOC TPVs, our earlier report deals with the influence of different peroxides [17], different coagents [18] and different mixing sequences [19,20] on the solid and melt state viscoelastic properties of PP/EOC TPVs. The present study primarily aims to evaluate the performance of the coagent assisted peroxide cured PP/EOC TPVs as a potential alternative to the conventional PP/EPDM TPVs.…”

Section: Introductionmentioning

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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“…The resulting blend comprises a thermoplastic resin filled with a high concentration of dispersed rubber particles [1][2][3]. In order to improve the processability, reduce the material cost and enhance the performance of the end-use products, oil often has been added into thermoplastic vulcanizates.…”

Section: Introductionmentioning

confidence: 99%

Effect of extender oils on the stress relaxation behavior of thermoplastic vulcanizates

Le¹,

Zia²,

Ilisch³

et al. 2008

Express Polym. Lett.

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Abstract. The long term mechanical behavior of oil extended thermoplastic vulcanizates (TPV) based on polypropylene (PP) and acrylonitrile-butadiene rubber (NBR) has been characterized by means of stress relaxation experiments. The morphology of TPV and the phase specific oil distribution which depend on the content and type of oil as well as on the mixing regime have been characterized by means of Atomic Force Microscopy (AFM), Dynamic Mechanical Thermal Analysis (DMTA) and Differential Scanning Calorimetrie (DSC). The discussion of the stress relaxation behavior was carried out using the two-component model, which allows splitting the initial stress into two components: a thermal activated stress component and an athermal one. A master curve was created by shifting the relaxation curves vertically and horizontally towards the reference curve. The vertical shift factor bT is a function of the temperature dependence of the athermal stress components. It was found that the oil distribution strongly affects the athermal stress component which is related to the contribution of the structural changes, e.g. crystallinity of the PP phase and the average molecular weight between the crosslinks of the NBR phase. From the temperature dependence of the horizontal shift factor aT the main viscoelastic relaxation process was determined as the α-relaxation process of the crystalline PP phase. It is not dependent on the polarity and content of the oil as well as the mixing regime.

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Studies on the influence of structurally different peroxides in polypropylene/ethylene alpha olefin thermoplastic vulcanizates (TPVs)

Cited by 47 publications

References 17 publications

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

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

Effect of extender oils on the stress relaxation behavior of thermoplastic vulcanizates

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