Microstructural development of elastomeric nanocomposites based on (50/50 wt%) styrene butadiene rubber (SBR) and epoxidized natural rubber (50 mol% epoxidation, ENR50) as the rubber matrix including two types of carbon fillers, carbon black (CB) and functionalized multiwall carbon nanotube (NH₂-MWCNT), which were prepared through melt mixing, was studied. The results from FTIR analysis show that there is interaction between functional groups on MWCNT surface and the rubber chains. The AFM analysis also indicates good dispersion of filler particles in the rubber phases. FESEM images from cryo-fractured surface of samples have revealed that nanotubes were rarely pulled out of matrix and their diameter increased, resulting from good interaction between MWCNTs and rubber chains. The DMA results confirm good interfacial interaction between them. Furthermore, the reduced difference between the two T_gs of phases (ΔT_g) shows that the incorporation of 3 phr MWCNT into the blend leads to increment in rubber phase compatibility but at higher MWCNT content (5 phr) due to lower Mooney viscosity of SBR phase, MWCNTs tend to remain in this phase. The bound rubber was adopted to characterize the polymer–filler interaction, showing that bound rubber content has an increasing trend with increasing in fillers content. The cure rheometric studies reveal that MWCNTs accelerate the cure process due to the presence of amine groups on the nanotube surface. In addition, the mechanical properties of samples show an increasing trend by increasing nano-filler content.

中文翻译：

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苯乙烯丁二烯橡胶/环氧化天然橡胶/碳填料纳米复合材料：微结构发展和硫化特性

基于（50/50 wt％）丁苯橡胶（SBR）和环氧化天然橡胶（50 mol％环氧化，ENR50）作为橡胶基质的弹性体纳米复合材料的微结构开发，包括两种类型的碳填料，炭黑（CB）和功能化多壁碳纳米管（NH ₂研究了通过熔融混合制备的-MWCNT）。FTIR分析的结果表明，MWCNT表面上的官能团与橡胶链之间存在相互作用。AFM分析还表明填料颗粒在橡胶相中的良好分散。样品的低温断裂表面的FESEM图像显示，由于MWCNT与橡胶链之间的良好相互作用，纳米管很少从基质中拉出，并且直径增大。DMA结果证实了它们之间的良好界面相互作用。另外，之间的差减小的两个T_克相的S（ΔT_克）表明将3 phr MWCNT掺入共混物中会导致橡胶相相容性增加，但由于SBR相的门尼粘度较低，因此在较高MWCNT含量（5 phr）下，MWCNT倾向于保留在该相中。采用结合橡胶来表征聚合物与填料的相互作用，这表明随着填料含量的增加，结合橡胶的含量也有增加的趋势。固化流变学研究表明，由于纳米管表面存在胺基，MWCNT加快了固化过程。另外，样品的机械性能通过增加纳米填料含量而显示出增加的趋势。