Effects of Composition and Processing Conditions on Morphology and Properties                 of Thermoplastic Elastomer Blends of SEBS-PP-Oil and Dynamically Vulcanized EPDM-PP-Oil

Sengupta, Payal; Noordermeer, Jacobus W.M.

doi:10.1177/0095244304042668

Cited by 45 publications

(40 citation statements)

References 16 publications

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“…The elastomeric phase of the blends produced on extruder can also present greater cross-linking density, as verified by Sengupta and Noordermeer [104]. However, the distribution of sizes of particles is more uniform in the blends produced in internal mixer due to longer residence time and greater total shear stress, promoting the breakdown of particles [104]. According to Shahbikian et al [105], that produced EPDM/PP blends in internal mixer and extruder, even with the shortest residence time for processing in extruders, the cure reaction occurred quickly, resulting in EPDM particles of sizes more heterogeneous and with greater crosslinking density.…”

Section: Elastomersmentioning

confidence: 58%

“…Studies show that blends produced on extruder tend to have smaller particle sizes compared to blends produced in internal mixer [20,71,[104][105][106] due to the higher shear rate during processing in extruders and intensive flow field [105]. The elastomeric phase of the blends produced on extruder can also present greater cross-linking density, as verified by Sengupta and Noordermeer [104]. However, the distribution of sizes of particles is more uniform in the blends produced in internal mixer due to longer residence time and greater total shear stress, promoting the breakdown of particles [104].…”

Section: Elastomersmentioning

confidence: 99%

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Devulcanization of Elastomers and Applications

Sousa¹

2017

Elastomers

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In no other phase of human development was produced such amount of waste as currently. Its composition and quantity are directly related to the way the population lives, socioeconomic condition and the ease of access to consumer goods. The irregular disposition of such waste may cause harmful environmental impacts. One of the most dangerous solid wastes is the vulcanized rubber, which, besides having high natural degradation time, has many chemical additives on its formulation and the possibility to store rain water when disposed in landfills and may become a breeding place for vectors.So, recycling comes against this problem and devulcanization is a way of recycling that restores the fluidity of the rubber. One of the applications of this devulcanized rubber is in the production of polymeric blends. Devulcanization of rubbers, the application of this material in polymeric blends based on thermoplastic/recycled rubber, and the parameters involved during the processing of these materials will be addressed in this work.

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Section: Elastomersmentioning

confidence: 58%

Section: Elastomersmentioning

confidence: 99%

Devulcanization of Elastomers and Applications

Sousa¹

2017

Elastomers

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“…In most cases with rapid reactive curing systems, the phase transformation occurs quite fast within the first one minute upon the addition of the curing system [58]. Despite this rapid onset, the final morphology of dynamically vulcanized blends depends on both the rate of the curing reaction and the total amount of shear exerted on the blend [69]. Large and to some extent coarse and interconnected vulcanized elastomeric domains have been reported for those dynamically cross-linked blends obtained in a twin-screw extruder in comparison to the ones from an internal mixer [14,69].…”

Section: Morphology Development In Dynamically Vulcanized Nonplasticimentioning

confidence: 99%

“…Despite this rapid onset, the final morphology of dynamically vulcanized blends depends on both the rate of the curing reaction and the total amount of shear exerted on the blend [69]. Large and to some extent coarse and interconnected vulcanized elastomeric domains have been reported for those dynamically cross-linked blends obtained in a twin-screw extruder in comparison to the ones from an internal mixer [14,69]. The observed morphological features have been mainly attributed to the fast curing reaction (due to larger viscous dissipation) and a shorter residence time in an extrusion process.…”

Section: Morphology Development In Dynamically Vulcanized Nonplasticimentioning

confidence: 99%

Plasticization and Morphology Development in Dynamically Vulcanized Thermoplastic Elastomers

Shahbikian¹,

Carreau²

2015

Thermoplastic Elastomers - Synthesis and Applications

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Dynamically vulcanized thermoplastic elastomers constitute one of the main categories among various types of thermoplastic elastomers (TPEs). Due to the commercial importance of this particular group of TPEs, tremendous efforts have been dedicated to improve the understanding and control the phase morphology development. The ultimate goal is to obtain materials with improved physical and mechanical properties. As in other polymeric compounds, the parameters during the mixing stage have a significant influence on the final morphology of dynamically vulcanized blends. Furthermore, the phase morphology and, therefore, the distribution of elastomeric domains in the thermoplastic phase are also strongly dependent on the formulation. This chapter discusses the main important processing factors and, more specifically, highlights the effects of plasticization and curing on the morphology development of dynamically vulcanized thermoplastic elastomer blends. The following text provides fundamental information on how one should take into consideration each parameter affecting the morphology of nonreactive and reactive elastomer/thermoplastic blends.

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“…As a result of these complex interactions, the majority of research works on the morphology development of TPEs have been mainly conducted in batch internal mixers by monitoring the effect of each component on the torque/temperature evolution of the blend. The batch mixing approach provides a unique capability in examining different phenomena such as dynamic vulcanization in TPVs [8–15]. A rigorous temperature control, sampling flexibility and wide choice of mixing residence time with comparably moderate flow dynamics within the internal mixer have considerably facilitated the assessment of various processing parameters on the morphology development of TPEs.…”

Section: Introductionmentioning

confidence: 99%

Morphology development of EPDM/PP uncross‐linked/dynamically cross‐linked blends

Shahbikian

Carreau

Heuzey

et al. 2011

Polymer Engineering & Sci

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Ethylene‐propylene‐diene‐terpolymer (EPDM) and polypropylene (PP)‐based uncross‐linked and dynamically cross‐linked blends were prepared both in an internal mixer and in a corotating twin‐screw extruder. The effects of composition, plasticization and mixing equipment on the morphology development and the final viscoelastic properties were studied. In the uncross‐linked blends, the plasticization resulted in a coarser morphology. Furthermore, it was shown that the majority of the plasticizer resided in the EPDM phase, enabling its deformation in the flow direction. In addition, the intensive mixing conditions inside the twin‐screw extruder resulted in a finer morphology. In the dynamically cross‐linked blends, the twin‐screw extrusion process resulted in a higher level of gel content with larger EPDM domains. The plasticization showed again a coarsening effect, resulting in interconnected cross‐linked EPDM domains. An interesting interfacial phenomenon was observed especially in the plasticized vulcanized blends where nanometer size occluded PP domains were stripped off and eroded into the EPDM phase. With the exception of the nonplasticized uncross‐linked blends, the viscoelastic properties of all other blending systems were found to be directly affected by the morphology, gel content (in the case of cross‐linked blends), and the presence of the plasticizer. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers

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Effects of Composition and Processing Conditions on Morphology and Properties of Thermoplastic Elastomer Blends of SEBS-PP-Oil and Dynamically Vulcanized EPDM-PP-Oil

Cited by 45 publications

References 16 publications

Devulcanization of Elastomers and Applications

Devulcanization of Elastomers and Applications

Plasticization and Morphology Development in Dynamically Vulcanized Thermoplastic Elastomers

Morphology development of EPDM/PP uncross‐linked/dynamically cross‐linked blends

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