Exploring the influence of electron beam irradiation on the morphology, physico-mechanical, thermal behaviour and performance properties of EVA and TPU blends

Polymers for Advanced Techs

Nando

2016

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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.

Section: Resultsmentioning

confidence: 99%

Section: Dielectric Properties Of the Blendsmentioning

confidence: 99%

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

Ramachandran

Polymers for Advanced Techs

Nando

2016

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“…During electron beam curing, the high energy electrons from electron beam generators induces the formation of free radicals through knocking out the labile hydrogen atoms from the elastomer backbone and subsequently stable CC crosslinks formation takes place through coupling of these free radicals …”

Section: Methodsmentioning

confidence: 99%

Temperature scanning stress relaxation measurements: A unique perspective for evaluation of the thermomechanical behavior of shape memory polymer blends

Chatterjee

Vennemann²,

J of Applied Polymer Sci

2017

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Shape memory polymer has the inherent capability of fixing its shape to a deformed or unconstrained shape that gives the material shape fixity and to revert back to its permanent shape that results shape recovery of the material. Temperature scanning stress relaxation (TSSR) studies of uncrosslinked and radiation crosslinked polymer blends of ethylene octene copolymer and ethylene propylene diene rubber has been carried out over a certain temperature range that gives the idea about the thermomechanical behavior of the material. With increasing radiation dose, TSSR index value of the radiation crosslinked blends increases, which is an indication of the improvement of the elasticity of the crosslinked network and thus results better shape recovery of the crosslinked blends when compared to the uncrosslinked one. Higher elasticity of the crosslinked network is also well supported by higher crosslink density and lower tension set value of the radiation crosslinked blends.

“…The gel fraction of the sample was calculated from the ratio of the dried weight ( D ) to the initial weight ( W ) using Eq . .

normalG normale normall normalf normalr normala normalc normalt normali normalo normaln (|, %) = \frac{D}{H} \times 100 % .

…”

Section: Methodsmentioning

confidence: 99%

Exploring a novel cyclic monofunctional peroxide for curing of silicone rubber at elevated temperature

Chatterjee

Wießner

Polymer Engineering & Sci

et al. 2016

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The curing characteristics of silicone rubber (polydimethylsiloxane [PDMS]) in the presence of structurally different peroxides, namely dicumyl peroxide (DCP) and 3,3,5,7,7-pentamethyl-1,2,4-trioxepane (PMTO), have been studied in details. At moderate temperature, DCP is more prominent for curing the silicone rubber but at high temperatures it suffers from low scorch safety. An inhibitor 2,2,6,6tetramethylpiperidinyloxyl (TEMPO) was added with DCP to stabilize the radicals in order to increase the scorch safety time. On the other hand, PMTO showed a prolonged scorch safety and better crosslinking efficiency rather than (DCP 1 TEMPO) mix at higher temperatures. PMTOcrosslinked PDMS shows better crosslinking efficiency as indicated by a higher gel content and low swelling index value. Also the mechanical properties, thermal stability, and dynamic mechanical behavior of PMTO-crosslinked PDMS are much superior than (DCP 1 TEMPO)-crosslinked PDMS. Apart from thermoplastic vulcanizates (TPVs) made from PMTO-crosslinked PDMS show better physicomechanical behavior compared to the TPVs made from (DCP 1 TEMPO)crosslinked PDMS. Moreover, DCP undergoes decomposition reactions at a higher temperature and forms acetophenone, which leads to an unpleasant smell in the final products whereas no such phenomenon is observed for PMTO. Therefore, PMTO turns out to be the suitable peroxide for crosslinking of PDMS at higher temperature. POLYM. FIG. 11. Storage modulus (E 0 ) of (DCP 1 TEMPO)-and PMTOcrosslinked PDMS. FIG. 12. Temile stress versus strain diagram.