Journal
COMPOSITE INTERFACES
Volume 28, Issue 1, Pages 35-62Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09276440.2020.1736879
Keywords
Mechanical properties; analytical modeling; viscoelastic behavior; interfacial interactions; Payne effect; Mooney-Rivlin plots; stress relaxation
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Funding
- UGC-DAE Consortium for Scientific Research, Kalpakkam Node, Kokilamedu, India
- MHRD (Govt. of India) [5-6/2013-TS.VII]
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This study investigates the influence of organomodified layered silicates on the mechanical and viscoelastic properties of EPDM-CIIR blends, revealing potential advantages in enhancing mechanical performance.
Ethylene propylene diene (EPDM)-chlorobutyl rubber (CIIR) blends can withstand both radiation and hydrocarbon environments and are used for elastomeric components in nuclear plants. This work investigates the influence of organomodified layered silicates (OMLS) on the mechanical and viscoelastic properties of EPDM-CIIR blends. The morphology and physicochemical interactions are evaluated by X-ray diffraction, transmission electron microscopy and Fourier transform infrared spectroscopy and correlated with the enhancement in mechanical properties. Mooney-Rivlin plots provided insight into the nonlinear mechanical behavior of EPDM-CIIR nanocomposites. From a dynamic mechanical analysis (DMA), it was found that blends with 5 phr OMLS content had the maximum storage modulus. Significant lowering as well as broadening of tand peak was observed for blends with well-dispersed OMLS (5 phr). The entanglement density and constrained volume near the interfaces, calculated from the DMA data, gave an insight to the reinforcing mechanism. Rheological characteristics of the nanoreinforced blends also revealed the stiffening effect of OMLS. Payne effect and stress relaxation studies confirmed good rubber-OMLS interactions. The applicability of various analytical models to predict the static and dynamic modulus as well as the Payne effect is explored.
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