Investigation into the structure–property relationship and technical properties of TPEs and TPVs derived from ethylene octene copolymer (EOC) and polydimethyl siloxane (PDMS) rubber blends

Padmanabhan, R.; Naskar, Kinsuk; Nando, G. B.

doi:10.1088/2053-1591/2/10/105301

Cited by 22 publications

(31 citation statements)

References 40 publications

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“…Recently, the authors studied the dynamic crosslinking of the EOC and PDMS rubber blends using dicumyl peroxide . However, peroxide crosslinking has the disadvantages like slow curing and inferior mechanical properties etc.…”

Section: Introductionsupporting

confidence: 81%

“…The second relaxation peak occurring at −20°C is considered as β transition of the co‐polymer presumed to be because of the side chain motion of the octene moieties within the EOC co‐polymer. The third relaxation appearing at a higher temperature of +47°C is known as the α′ transition temperature is assumed to be because of initiation of the segmental motion in the crystalline zone of EOC . Santra et al reported similar observations in the case of LDPE:PDMS system and Giri et al reported similar results for LLDPE:PDMS blend system before and after electron beam irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…( a ) that, as the neat EOC gets crosslinked, the α′ peak shifts towards a lower temperature an indication of lowering the crystallinity. Because as the EOC phase gets crosslinked more, it disturbs the crystallinity of the EOC which causes the α′ peak to shift to a lower temperature . All other blends of EOC with PDMS rubber after irradiation exhibit a broad transition in between −120°C and −118°C, which is considered to be because of the glass transition temperature of PDMS rubber …”

Section: Resultsmentioning

confidence: 99%

“…The relaxation occurring at a lower temperature of around −116°C is considered to be the glass transition temperature (T g ) of PDMS rubber. The broad transition occurs between −40°C to −60°C is considered to be because of the merging of two relaxation peaks: one at −60°C because of cold crystallization and the other at −40°C because of the brittleness temperature of PDMS rubber . The broad transition occurring at a higher temperature between −10°C and +10°C is because of the relaxation of PDMS rubber chains.…”

Section: Resultsmentioning

confidence: 99%

“…After the equilibrium swelling the swollen mass and deswollen mass were measured and used to calculate the V r as per eqn . From the swollen mass and the deswollen mass the overall crosslink density was calculated relative to the (EOC and PDMS) phases as expressed by (ν + EOC) by the following equation

((), normalν + normalE normalO normalC) = prefix- \frac{1}{{normalV}_{normalS}} \times {\frac{\ln (1 - V_{r}) + V_{r} + χ V_{r}}{{((), {normalV}_{normalr})}^{\frac{1}{3}} - 0.5 {normalV}_{normalr}}}^{2}

where…”

Section: Methodsmentioning

confidence: 99%

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Exploring the effect of radiation crosslinking on the physico‐mechanical, dynamic mechanical and dielectric properties of EOC–PDMS blends for cable insulation applications

Ramachandran

Naskar

Nando

2016

Polymers for Advanced Techs

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This work focuses on the effect of electron beam irradiation on the physico‐mechanical, dynamic mechanical and dielectric properties of blends based on ethylene octene copolymer (EOC) and poly dimethyl siloxane (PDMS) rubber. It is found that electron beam irradiation caused considerable improvement in the physico‐mechanical properties; the tensile strength was enhanced by nearly 35% for 70:30 EOC:PDMS blend. Phase morphology of the blends analyzed before irradiation by scanning electron microscopy (SEM) exhibited droplet/matrix morphology with sizes of the PDMS rubber domain varying from 0.55 µm to 0.47 µm as the amount of PDMS rubber decreased from 30 wt% to 10 wt%. This reduction in the PDMS rubber domain has been correlated with the physico‐mechanical properties of the blends. Further, the dynamic mechanical properties and creep behavior of these EOC:PDMS blends before and after irradiation has been studied. It is inferred that the 70:30 blend after radiation crosslinking shows a 17% decrease in the creep compliance, i.e. higher creep resistance compared to neat blends. All the radiation crosslinked blends exhibited lower dielectric constant, lower dielectric loss and higher electrical resistivity as compared to the virgin blends which makes it suitable for cable insulating application. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

((), normalν + normalE normalO normalC) = prefix- \frac{1}{{normalV}_{normalS}} \times {\frac{\ln (1 - V_{r}) + V_{r} + χ V_{r}}{{((), {normalV}_{normalr})}^{\frac{1}{3}} - 0.5 {normalV}_{normalr}}}^{2}

where…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Exploring the effect of radiation crosslinking on the physico‐mechanical, dynamic mechanical and dielectric properties of EOC–PDMS blends for cable insulation applications

Ramachandran

Naskar

Nando

2016

Polymers for Advanced Techs

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3D‐Knit Dry Electrodes using Conductive Elastomeric Fibers for Long‐Term Continuous Electrophysiological Monitoring

Eskandarian

Toossi²,

Nassif³

et al. 2022

Adv Materials Technologies

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Recent advances in telemedicine and personalized healthcare have motivated new developments in wearable technologies targeting continuous monitoring of biosignals. Common limitations of wearables for continuous monitoring include durability and breathability of their biopotential electrodes. This paper tackles this challenge by proposing flexible, breathable, and washable dry textile electrodes made of conductive elastomeric filaments (CEFs). First, candidate CEF fibers are characterized. Using an industrial knitting machine, CEF fibers are then directly knitted into textile electrodes. To assess their performance in more realistic circumstances, smart garments with textile electrodes are knitted. Electrocardiograms (ECGs) are acquired using an underwear garment and electrooculograms (EOGs) are acquired using a headband. ECGs and EOGs with textile electrodes are found to have comparable fidelity to that of the gold standard gel electrodes. CEF electrodes are also resistant to repeated wash and dry cycles (30×) and continue to acquire high‐fidelity biosignals. Smart underwear garments are also used to perform continuous ECG measurements in five participants over 24 h of unrestricted daily activities. Results demonstrate the success of these garments in performing high fidelity continuous ECG monitoring. Collectively, these results present CEF electrodes as a promising scalable solution to the challenges of wearable technologies for long‐term continuous electrophysiological monitoring applications.

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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.

show abstract

Investigation into the structure–property relationship and technical properties of TPEs and TPVs derived from ethylene octene copolymer (EOC) and polydimethyl siloxane (PDMS) rubber blends

Cited by 22 publications

References 40 publications

Exploring the effect of radiation crosslinking on the physico‐mechanical, dynamic mechanical and dielectric properties of EOC–PDMS blends for cable insulation applications

Exploring the effect of radiation crosslinking on the physico‐mechanical, dynamic mechanical and dielectric properties of EOC–PDMS blends for cable insulation applications

3D‐Knit Dry Electrodes using Conductive Elastomeric Fibers for Long‐Term Continuous Electrophysiological Monitoring

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

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