Efficiency of high energy electrons to produce polypropylene/natural rubber‐based thermoplastic elastomer

Mondal, Manas; Gohs, Uwe; Wagenknecht, Udo; Heinrich, Gert

doi:10.1002/pen.23414

Cited by 10 publications

(9 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At a dose of 200 kGy, a maximum gel content of 82% was obtained, indicating the formation of highly crosslinked mNR. Mondal et al [10] investigated the effect of absorbed dose on the gel content of virgin NR with a number molecular mass of 371,000 g mol −1 . The result showed that the gel content increased from ~15% and ~64% as absorbed dose increased from 50 to 200 kGy.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Electron Induced Crosslinking of Masticated Natural Rubber at Different Temperatures

et al. 2019

View full text Add to dashboard Cite

In this work, natural rubber (NR) was masticated using an internal mixer to fit the requirements of reactive blending with polylactide and characterized by size exclusion chromatography (SEC), Fourier-transform infrared (FT-IR) spectroscopy and dynamic rheology measurements. Subsequently, the effect of elevated temperatures (25 °C, 80 °C, and 170 °C) on the electron beam (EB) induced crosslinking and degradation of masticated natural rubber (mNR) in a nitrogen atmosphere without adding crosslinking agents has been investigated. The sol gel investigation showed that the gel dose of mNR slightly increased with increasing irradiation temperature, which is also confirmed by the swelling test. The chain scission to crosslinking ratio (Gs/Gx) was found to be less than 1 for irradiated mNR at 25 °C and 80 °C, suggesting a dominating crosslinking behavior of mNR. However, a significant increase of Gs/Gx ratio (~1.12) was observed for mNR irradiated at 170 °C due to the enhanced thermal degradation behavior at high temperature. A remarkably improved elasticity (higher complex viscosity, higher storage modulus, and longer relaxation time) for EB modified mNR was demonstrated by dynamic rheological analysis. Particularly, the samples modified at higher temperatures represented more pronounced elasticity behavior which resulted from the higher number of branches and/or the longer branched chains.

show abstract

Section: Resultsmentioning

confidence: 99%

“…This irradiation technique is based on a free radical process and can be carried out quickly, under well-controlled conditions and in the absence of a crosslinking agent. Nowadays, the EB modification method is strongly developed to modify the crosslinking and mechanical properties of NR [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Electron Induced Crosslinking of Masticated Natural Rubber at Different Temperatures

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In 2013, Mondal et al has reported ecofriendly electron induced reactive processed PP/NR TPVs. [65][66][67][68] But for automotive application, the TPVs are exposed at high temperature and it must be oil resistant. This is the drawback of those type of systems.…”

Section: Tpvs Based On Pp/ethylene α-Olefin (Eoc)mentioning

confidence: 99%

“…Apart from the above‐mentioned TPVs research works has also been carried out on PP/NR based TPVs. In 2013, Mondal et al has reported ecofriendly electron induced reactive processed PP/NR TPVs . But for automotive application, the TPVs are exposed at high temperature and it must be oil resistant.…”

Section: State Of the Art: Different Tpvsmentioning

confidence: 99%

Automotive applications of thermoplastic vulcanizates

Bhattacharya

Chatterjee

Naskar

2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Thermoplastic vulcanizates (TPVs) are special classes of thermoplastic elastomers, in which dynamic vulcanization of the rubber phase takes place during melt mixing with a semicrystalline thermoplastic matrix phase at elevated temperature. This review article focus on the different types of thermoplastic vulcanizates (TPVs) from various elastomer and thermoplastic blends that are suitable for the automotive applications purpose. A detailed study of the various TPVs based on polypropylene-ethylene propylene diene rubber (PP-EPDM) and polypropylene-ethylene α-olefin has been focused and their application in the automobile sector has been summarized. Most of the commercially available TPVs are PP-EPDM based. Limited applications of that TPVs in high heat and oil resistant application purposes requires new generation of TPVs. High performance TPVs or super TPVs are new generation TPVs that exhibit high heat resistance as well as excellent oil resistance property suitablefor automotive under-the-hood applications. Therefore TPVs based on XNBR-PA12, HNBR-PA12 and FKM-PA6 system has also been explored in details in this study and the possibility of the use of those TPV system has been focused for the high temperature application purpose in the automobile sector where high and oil resistant application properties is the prime concern.

show abstract

“…where P n is the initial number-averaged degree of polymerization and D is the absorbed radiation dose in kGy [32]. Many radiation-induced chemical changes are measured quantitatively in terms of a G value, this being the number of such changes produced per 100 eV absorbed in the system [30].…”

Section: Estimation Of G Values Of Crosslinking By the Charlesby-pinnmentioning

confidence: 99%

Influence of Branching Density in Ethylene-Octene Copolymers on Electron Beam Crosslinkability

Svoboda

2015

Polymers

View full text Add to dashboard Cite

Two ethylene-octene copolymers (EOC) with the same melt flow index (MFI = 3 g/10 min) but different octene contents, being 20 and 35 wt % (EOC-20 and EOC-35), were compared with regard to sensitivity to electron beam crosslinking. Dynamic mechanical analysis (DMA) revealed a large influence of the octene content on the storage modulus and the glass transition temperature (T g ) but a smaller influence of irradiation on the properties below melting point (T m ). Rheology at 150˝C pointed out large differences in samples crosslinked in the 0-60 kGy range and at lower frequencies (0.1-1 Hz). The loss factor tanδ confirmed that before irradiation the two copolymers were very similar, while after irradiation to 120 kGy, the EOC-35 had considerably lower tanδ than EOC-20, which corresponds to a better elasticity (or a higher level of crosslinking). A high-temperature creep test showed a considerably lower creep for EOC with a higher octene content. An analysis of the insoluble gel content exhibited higher values for EOC-35 confirming a higher level of crosslinking. Analysis according to the Charlesby-Pinner equation revealed increased crosslinking-to-scission ratio, G(X)/G(S), for EOC-35. While the G(X) value changed only slightly, a significant decrease in the G(S) value was discovered.

show abstract

Efficiency of high energy electrons to produce polypropylene/natural rubber‐based thermoplastic elastomer

Cited by 10 publications

References 34 publications

Evaluation of Electron Induced Crosslinking of Masticated Natural Rubber at Different Temperatures

Evaluation of Electron Induced Crosslinking of Masticated Natural Rubber at Different Temperatures

Automotive applications of thermoplastic vulcanizates

Influence of Branching Density in Ethylene-Octene Copolymers on Electron Beam Crosslinkability

Contact Info

Product

Resources

About