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首页> 外文期刊>Journal of Applied Polymer Science >Synergistic enhancement of mechanical, viscoelastic, transport, thermal, and radiation aging characteristics through chemically bonded interface in nanosilica reinforcedEPDM-CIIRblends
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Synergistic enhancement of mechanical, viscoelastic, transport, thermal, and radiation aging characteristics through chemically bonded interface in nanosilica reinforcedEPDM-CIIRblends

机译：通过在纳米碱加固的化学键合界面进行机械，粘弹性，输送，热和辐射老化特性的协同增强

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The study investigates the influence of bis(3-triethoxysilylpropyl)tetrasulfide (TESPT) grafted nanosilica (NS) reinforcement on the mechanical, viscoelastic, thermal, and transport characteristics as well as behavior after exposure to different cumulative gamma-radiation doses of EPDM-CIIR blends for application in nuclear and hydrocarbon environments. The tensile strength and modulus of the nanocomposites were enhanced upto 64% and 118%, respectively whereas solvent diffusion coefficient reduced by 22%. The degradation onset temperature improved from 485 degrees C for unfilled blends to 503 degrees C for the nanocomposites. gamma-radiation aging resistance of EPDM-CIIR blends improved with incorporation of nanosilica, with blends containing 7.5phrNS showing optimum properties and radiation aging resistance. The property improvements are attributed to the dispersion of NS and chemically interfaced covalent linkages between SiO2-EPDM/CIIR chains that provides large interfacial area for effective stress transfer and creates barrier to free radical and solvent permeation. The applicability of Korsmeyer-Peppas, Peppas-Sahlin, and Higuchi models to predict of sorption behavior are investigated. Coats-Redfern and Horowitz-Metzger models were employed to evaluate the activation energy for thermal degradation. Slight decline in properties at higher nanofiller contents was due to the formation of agglomerates. TEM, FTIR, and rheological curves were utilized to corroborate these observations. FTIR and ESR analysis provided insight on the chemical changes in the nanocomposites after irradiation.
机译：本研究调查了双（3-三乙氧基硅丙基）四硫化物（TESPT）接枝纳米二氧化硅（NS）增强材料对EPDM-CIIR共混物在核环境和碳氢化合物环境中暴露于不同累积γ辐射剂量后的机械、粘弹性、热和传输特性以及行为的影响。纳米复合材料的拉伸强度和模量分别提高了64%和118%，而溶剂扩散系数降低了22%。降解起始温度从未填充共混物的485℃提高到纳米复合材料的503℃。加入纳米二氧化硅后，EPDM-CIIR共混物的耐γ辐射老化性能得到改善，含有7.5phrNS的共混物表现出最佳的性能和耐辐射老化性能。性能改善归因于NS的分散和SiO2 EPDM/CIIR链之间的化学界面共价键，为有效的应力传递提供了大的界面面积，并为自由基和溶剂渗透创造了障碍。研究了Korsmeyer-Peppas、Peppas-Sahlin和Higuchi模型预测吸附行为的适用性。Coats-Redfern和Horowitz-Metzger模型用于评估热降解的活化能。纳米填料含量较高时，性能略有下降，这是由于结块的形成。TEM、FTIR和流变曲线被用来证实这些观察结果。FTIR和ESR分析提供了纳米复合材料在辐照后的化学变化。

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