Nanoreinforcement mechanism of organomodified layered silicates in EPDM/CIIR blends: experimental analysis and theoretical perspectives of static mechanical and viscoelastic behavior,Composite Interfaces

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Nanoreinforcement mechanism of organomodified layered silicates in EPDM/CIIR blends: experimental analysis and theoretical perspectives of static mechanical and viscoelastic behavior
Composite Interfaces ( IF 2.1 ) Pub Date : 2020-03-12 , DOI: 10.1080/09276440.2020.1736879
Neelesh Ashok _{1,

2} , Meera Balachandran _{1,

2} , Narayan Chandra Das ₃ , Sanjay Remanan ₃

Affiliation

ABSTRACT 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 tanδ 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. Graphics Abstract

中文翻译：

EPDM/CIIR 共混物中有机改性层状硅酸盐的纳米增强机制：静态力学和粘弹性行为的实验分析和理论观点

摘要三元乙丙橡胶 (EPDM)-氯化丁基橡胶 (CIIR) 共混物可以承受辐射和碳氢化合物环境，可用于核电站的弹性部件。这项工作研究了有机改性层状硅酸盐 (OMLS) 对 EPDM-CIIR 共混物的机械和粘弹性性能的影响。通过 X 射线衍射、透射电子显微镜和傅里叶变换红外光谱评估形态和物理化学相互作用，并与机械性能的增强相关联。Mooney-Rivlin 图提供了对 EPDM-CIIR 纳米复合材料非线性力学行为的深入了解。通过动态力学分析 (DMA)，发现 5 份 OMLS 含量的混合物具有最大储能模量。对于与分散良好的 OMLS (5 phr) 的混合物，观察到 tanδ 峰的显着降低和扩大。根据 DMA 数据计算出的界面附近的纠缠密度和约束体积可以深入了解增强机制。纳米增强共混物的流变特性也揭示了 OMLS 的硬化效果。佩恩效应和应力松弛研究证实了橡胶-OMLS 的良好相互作用。探讨了各种分析模型在预测静态和动态模量以及佩恩效应方面的适用性。图形摘要纳米增强共混物的流变特性也揭示了 OMLS 的硬化效果。佩恩效应和应力松弛研究证实了橡胶-OMLS 的良好相互作用。探讨了各种分析模型在预测静态和动态模量以及佩恩效应方面的适用性。图形摘要纳米增强共混物的流变特性也揭示了 OMLS 的硬化效果。佩恩效应和应力松弛研究证实了橡胶-OMLS 的良好相互作用。探讨了各种分析模型在预测静态和动态模量以及佩恩效应方面的适用性。图形摘要

更新日期：2020-03-12

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