Dynamically vulcanized blends of UHM-EPDM and polypropylene: Role of nano-fillers improving thermal and rheological properties

Bhattacharya, Asit Baran; Chatterjee, Tuhin; Naskar, Kinsuk

doi:10.1016/j.mtcomm.2020.101486

Cited by 12 publications

(16 citation statements)

References 34 publications

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“…Due to the above structure characteristics, TPV has an excellent resilience like conventional vulcanized elastomers and good processability like thermoplastics, named as “green rubber.” In recent years, much effort has been paid to the development of functional TPV materials 19 . Recently, in order to obtain functional TPVs to expand the range of their practical applications, attention has been paid to development of TPV composed of fillers 19,20 . In our previous work, a double network strategy, elastic EPDM network, and conductive MWCNT network in PP matrix, has been realized during in situ dynamic vulcanization.…”

Section: Introductionmentioning

confidence: 99%

Multiwalled carbon nanotubes filled thermoplastic vulcanizate dielectric elastomer with excellent resilience properties via inhibiting MWCNT network formation

Dou

2020

J of Applied Polymer Sci

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Multiwalled carbon nanotubes (MWCNTs) filled thermoplastic vulcanizate (TPV) dielectric elastomer based on polypropylene (PP)/ethylene-propylenediene monomer blends were fabricated via a simple melt compounding. MWCNT could be selectively distributed in PP matrix which induced by the dynamic vulcanization reaction. By reducing the rotor speed of melting blending to 60 rpm, the MWCNT network formation can be effectively inhibited, which have been verified by a higher volume resistivity (above 10 9 Ω cm). With increasing the MWCNTs loading to 4.1 vol%, a maximum increase, 423.4% (from 3.04 to 12.87), of the dielectric constant have been achieved for TPV/MWCNTs elastomer at 10 3 Hz, while the dielectric loss is still lower than 0.072 at 10 1-10 3 Hz. Meanwhile, with various MWCNTs loading, the tensile recovery of these series TPV elastomer does not change anymore, resulting an excellent rebound resistance. The TPV elastomer exhibits an enhanced dielectric performance and balanced elastic recovery performance, providing a simple and scalable melt compounding approach to fabricate high-performance dielectric elastomer.

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Section: Introductionmentioning

confidence: 99%

Multiwalled carbon nanotubes filled thermoplastic vulcanizate dielectric elastomer with excellent resilience properties via inhibiting MWCNT network formation

Dou

2020

J of Applied Polymer Sci

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“…Due to the increasing viscous nature and interruption in the network structure this phenomenon is observed. All the rheological data obtained from the SS and FS has been tabulated in the Table 3 30–32 …”

Section: Resultsmentioning

confidence: 99%

“…All the rheological data obtained from the SS and FS has been tabulated in the Table 3. [30][31][32]…”

Section: Crosslink Densitymentioning

confidence: 99%

Influence of different mixing sequence on UHMW‐EPDM based thermoplastic vulcanizates: Mechanical, rheological and morphological characteristics

Bhattacharya

Das

Sreethu

et al. 2022

J of Applied Polymer Sci

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An important factor for the preparation of thermoplastic vulcanizates (TPVs) is the mixing sequence or technique as it is controlling the product quality and production rate. The effect of different routes of mixing sequences on the mechanical properties and rheological properties have been studied. Four different types of mixing sequences have been pursued and ultra-high molecular weight EPDM (UHMW-EPDM) master batch technique has shown maximum prospect over the melt blending method. Co-agent master-batch sample showed optimum balance between TS and %EB over the other master-batch samples. Melt blending technique shows moderate properties for all cases. Rheological data follows the same trend as observed for the mechanical properties. Crosslink density also found the highest for the co-agent master-batch sample and co-agent/peroxide master-batch sample over the other two samples. Cryo-fractured and etched TPV samples were prepared and examined in FE-SEM. Co-agent master-batch sample shows the droplet type morphology.This new type of UHMW-EPDM based TPV with co-agent/rubber masterbatch mixing technique leads to superior physico-mechanical properties over the other mixing techniques. These newly established TPVs can be used as various injection molded parts, esthetic seals/strips and 2K-molds for the automotive applications.

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“…It is observed for all the samples, degradation temperature range is all most same for all the TPV samples, which is from 490 to 500°C. [ 38–42 ] In the TSSR study, the best thermomechanical property has been found for ZMA, then ZDMA, and followed by the other co‐agents. It is also identified that the TGA result and TSSR result follow the same tendency.…”

Section: Resultsmentioning

confidence: 99%

Exploring the thermomechanical properties of peroxide/co‐agent assisted thermoplastic vulcanizates through temperature scanning stress relaxation measurements

Bhattacharya

Anagha

Chatterjee

et al. 2021

Polymer Engineering & Sci

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Temperature scanning stress relaxation (TSSR) measurement of peroxide vulcanized polymer blends of polypropylene (PP) and ultrahigh molecular‐EPDM (UHM‐EPDM) rubber has been performed to study the thermomechanical behavior of thermoplastic vulcanizates (TPVs). Co‐agents play crucial roles in the enhancement of properties of TPVs. Different types of co‐agents (Triallyl cyanurate‐TAC; N, N‐m‐phenylene‐dimaleimide‐HVA2; zinc dimethacrylate‐ZDMA; and in‐situ formed zinc dimethacrylate‐ZMA) have been explored in this work. TSSR study shows that higher T50 and T90 values have been achieved in ZMA co‐agent assisted‐TPV. Higher TSSR‐index (RI) value was also found for the same co‐agent ZMA, indicating higher elastic behavior. TSSR result supports the mechanical and rheological properties, and it is found that the ZMA and ZDMA show higher mechanical strength. Cross‐linked‐density calculated by modified Flory–Rehner equation and the cross‐link‐density as obtained from TSSR method have been compared and the trend was found to be the same. Stress relaxation study shows the slow relaxation‐phenomena of the ZMA‐TPV with slowest relaxation‐time (θr) than the other TPVs, which correlates with superior material strength. Thermogravimetric analysis proves that there is a difference in degradation temperature of the blends at approximately 5–10°C. Ultrahigh molecular weight‐EPDM/PP based TPVs reveal superior thermomechanical and physico‐mechanical properties with ZMA and ZDMA co‐agent over TAC and HVA2. These ultrahigh molecular weight‐EPDM based TPVs can be used in automotive seals/strips, hoses, bellows, and 2 K‐molds for automotive applications.

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Dynamically vulcanized blends of UHM-EPDM and polypropylene: Role of nano-fillers improving thermal and rheological properties

Cited by 12 publications

References 34 publications

Multiwalled carbon nanotubes filled thermoplastic vulcanizate dielectric elastomer with excellent resilience properties via inhibiting MWCNT network formation

Multiwalled carbon nanotubes filled thermoplastic vulcanizate dielectric elastomer with excellent resilience properties via inhibiting MWCNT network formation

Influence of different mixing sequence on UHMW‐EPDM based thermoplastic vulcanizates: Mechanical, rheological and morphological characteristics

Exploring the thermomechanical properties of peroxide/co‐agent assisted thermoplastic vulcanizates through temperature scanning stress relaxation measurements

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