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The gel content effect on rheological and physical properties of cured acrylonitrile-butadiene rubber/poly(ethylene-co-vinyl acetate)/organo-montmorillonite nanocomposites
Iranian Polymer Journal ( IF 3.1 ) Pub Date : 2021-06-12 , DOI: 10.1007/s13726-021-00939-4
Mohammad Razavi-Nouri , Alireza Sabet , Maryam Mohebbi

The present work demonstrates the relationship between the tensile and hardness properties, crystalline structure as well as rheological behavior and gel content for the organo-montmorillonite (OMMT) filled poly(ethylene-co-vinyl acetate) (EVA)/acrylonitrile-butadiene rubber (NBR) nanocomposites. The NBR/EVA mixtures containing 5% (wt) OMMT were first provided and then cured with 0–2% (wt) dicumyl peroxide. The results of tensile experiments showed that while the elastic modulus and yield stress linearly increased, strain-at-break linearly decreased with gel content in the range studied. It was also found that the tensile strength and modulus at 100 and 300% strain increased exponentially, however, energy-at-break decreased in the form similar to an inverse S-shaped curve with gel content. The Cole–Cole plots revealed that the relaxation time increased progressively with the increase in gel content. Wide-angle X-ray diffractometry showed that the peak intensity ratio of I110/I200 was reduced by the addition of OMMT and increased somewhat with increasing in gel content. In addition, the Casson plot was employed to calculate the yield stress of the materials. The results indicated that the yield stress of the uncured nanocomoposite was higher than that of the simple blend and the value progressively increased with the increase in gel content.



中文翻译:

凝胶含量对固化丙烯腈-丁二烯橡胶/聚(乙烯-共-醋酸乙烯酯)/有机蒙脱石纳米复合材料流变和物理性能的影响

目前的工作证明了有机蒙脱石 (OMMT) 填充的聚(乙烯-共聚物)的拉伸和硬度性能、晶体结构以及流变行为和凝胶含量之间的关系。-醋酸乙烯酯) (EVA)/丙烯腈-丁二烯橡胶 (NBR) 纳米复合材料。首先提供含有 5% (wt) OMMT 的 NBR/EVA 混合物,然后用 0-2% (wt) 过氧化二异丙苯固化。拉伸实验结果表明,虽然弹性模量和屈服应力线性增加,但断裂应变随凝胶含量在研究范围内线性降低。还发现在 100% 和 300% 应变下的拉伸强度和模量呈指数增加,然而,断裂能以类似于具有凝胶含量的倒 S 形曲线的形式降低。Cole-Cole 图显示弛豫时间随着凝胶含量的增加而逐渐增加。广角X射线衍射表明峰强度比为I 110 / I 200通过添加 OMMT 降低了,并随着凝胶含量的增加而有所增加。此外,使用卡森图来计算材料的屈服应力。结果表明,未固化纳米复合材料的屈服应力高于简单共混物的屈服应力,并且该值随着凝胶含量的增加而逐渐增加。

更新日期:2021-06-13
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