Influence of network structure on the viscoelastic properties of dynamically vulcanized rubber/plastic blends: An alternative approach to understand the microstructure evolution

Dey, Pranab; Naskar, Kinsuk; Dash, Biswaranjan; Nair, Sujith; Unnikrishnan, Ginu; Nando, G. B.

doi:10.1016/j.mtcomm.2014.09.002

Cited by 13 publications

(20 citation statements)

References 45 publications

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“…Figure (a–c) shows the phase images of the three TPVs respectively. The light‐yellow regions in the phase images indicate presence of cross‐linked rubber particles and dark‐brown region represents the PA12 phase . Previously it was reported by many researchers that TPV contains micron‐sized rubber particles dispersed in continuous thermoplastic matrix phase .…”

Section: Resultsmentioning

confidence: 97%

“…The availability of the rubber molecules to the dynamic transition becomes lower with gradual addition of plastic phase (from 30 parts to 50 parts) into the blends. This is due to the immobilization of the rubber molecules which comes close to the plastic phase and as a result that rubber molecules cannot contribute to the dynamic transition which implies lower dissipation of energy (lower tan δ values) . Another peak in tan δ plot was observed near about 50°C, which corresponds to the glass transition peak of polyamide (PA12).…”

Section: Resultsmentioning

confidence: 99%

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Development of novel polar thermoplastic vulcanizates based on ethylene acrylic elastomer and polyamide 12 with special reference to heat and oil aging

Ismail

Chatterjee

Naskar

2015

J of Applied Polymer Sci

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Thermoplastic vulcanizates (TPVs) based on ethylene acrylic elastomer (AEM) and polyamide 12 (PA12) have been developed by the dynamic vulcanization process, in which selective cross-linking of the elastomer phase (AEM) during melt mixing with the thermoplastic phase (PA12) has been carried out simultaneously. TPVs at varied blend ratios (50 : 50, 60 : 40, 70 : 30) of AEM/ PA12 were prepared at 1858C at a rotor speed of 80 rpm up to 5 min of mixing. Di-(2-tert-butyl peroxy isopropyl) benzene (DTBPIB) was chosen as the suitable cross-linking peroxide to carry out the dynamic vulcanization. Morphology study reveals the development of continuous agglomerate of rubber network in case of all the TPVs took place and the average dimension of the rubber particles are in the range of 30-40 nm. TPV based on 50 : 50 AEM/PA12 shows better physicomechanical properties, thermal stability, and dynamic mechanical behavior among all the TPVs. For aging test, TPVs were exposed to air, ASTM oil 2 and 3. Air aging tests were carried out in hot air oven for 72 h at 1258C, while the oil aging tests were carried out after immersion of the samples into the oils in an aging oven. After aging, there are only slight deterioration of physicomechanical properties of the TPVs. Particularly in case of 50 : 50 blend of AEM/PA12, the retention of the properties even after aging was found excellent. The recyclability of these new TPVs is also found to be excellent leading to find potential application in automotives. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym.Sci. 2015, 132, 42655.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Development of novel polar thermoplastic vulcanizates based on ethylene acrylic elastomer and polyamide 12 with special reference to heat and oil aging

Ismail

Chatterjee

Naskar

2015

J of Applied Polymer Sci

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“…Figure (a–d) demonstrates the phase images of the peroxide crosslinked blends at different blend ratios. The light‐yellow region in the AFM images represents the crosslinked EVA domain and the dark brown region indicates the TPU phase . The microstructure of TPVs including the shape and size of rubber phase and their distribution in the matrix plays significant role in determining the final mechanical properties and processability of the crosslinked blend system .…”

Section: Resultsmentioning

confidence: 99%

Scrutinizing the influence of peroxide crosslinking of dynamically vulcanized EVA/TPU blends with special reference to cable sheathing applications

Dutta

Ramachandran

Naskar

2016

J of Applied Polymer Sci

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A novel thermoplastic vulcanizate (TPV) based on the blends of ethylene vinyl acetate/thermoplastic polyurethane (EVA/ TPU) at various blend ratios has been developed via dynamic vulcanization at 180 8C using di-(2-tert-butyl peroxy isopropyl) benzene (DTBPIB) peroxide as the cross-linking agent. Modification of the EVA/TPU blends via dynamic crosslinking significantly improves the tensile strength and modulus of the system and the improvement is more significant for EVA/TPU 50/50 and 60/40 blends. AFM study shows that crosslinked EVA particles are dispersed in the continuous TPU matrix and the dispersed EVA domain sizes are relatively smaller in EVA/TPU 50/50 and 60/40 blends leading to good mechanical properties. FTIR spectroscopy has been used to characterize the specific chemical changes occurring due to dynamic vulcanization. This TPV has excellent retention of physicomechanical properties even after reprocessing twice and the blends also have very good thermal resistance as indicated by aging study. The samples were found to exhibit remarkable improvement in oil resistance property as compared to their uncrosslinked counterpart. The creep behavior of the blends significantly improves after dynamic crosslinking and blends with higher TPU content show better creep resistance. Volume resistivity of all the peroxide vulcanized blends is in the range of 10 13 ohm cm, which is suitable for cable sheathing application.

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“…As seen in Fig. 1, the mixing torque levels off at the end of dynamic vulcanization which indicates that the system is still melt processable even after the formation of cross-linked structure in the rubber phase [19,21]. At this stage, the cross-linked rubber particles get dispersed in the thermoplastic matrix and helps in attainment of higher elasticity of the rubber phase.…”

Section: Mixing Torque Of Tpvs Containing Sulphur Cured Rubber Phasementioning

confidence: 94%

“…As the vulcanization proceeds, all the broken rubber nanodroplets transform into cross-linked nanoparticles (Fig. 4(D)), which has then undergone random agglomeration [21] to bestow a stable cocontinuous structure, with the increase in the degree of crosslinking of the rubber phase ( Fig. 4(E)).…”

Section: Morphology Studymentioning

confidence: 99%

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

Dey

Naskar

Nando

2015

Polymer

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Influence of network structure on the viscoelastic properties of dynamically vulcanized rubber/plastic blends: An alternative approach to understand the microstructure evolution

Cited by 13 publications

References 45 publications

Development of novel polar thermoplastic vulcanizates based on ethylene acrylic elastomer and polyamide 12 with special reference to heat and oil aging

Development of novel polar thermoplastic vulcanizates based on ethylene acrylic elastomer and polyamide 12 with special reference to heat and oil aging

Scrutinizing the influence of peroxide crosslinking of dynamically vulcanized EVA/TPU blends with special reference to cable sheathing applications

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

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