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首页> 外文期刊>Journal of Applied Polymer Science >Influence of the addition of multi-walled carbon nanotubes on the thermal and mechanical properties of polyamide-11 before and after aging tests
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Influence of the addition of multi-walled carbon nanotubes on the thermal and mechanical properties of polyamide-11 before and after aging tests

机译：多壁碳纳米管的增加对老化试验前后聚酰胺-11的热和力学性能的影响

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In this work, the preparation and characterization of nanocomposites of commercial polyamide-11 reinforced with multi-walled carbon nanotubes (MWCNT), untreated, oxidized or with the modified surface through silanization with 3-aminopropyl trimethoxy silane (APTMS), in concentrations of 0.1%, 0.5%, and 1.0 wt% in the polymer matrix was investigated. The processing of the nanocomposites was carried out via mixing in the molten state in a twin-screw mini-extruder at 200 degrees C under 60 rpm screw rotation speed, with a residence time of 7 min. The addition of the MWCNT increased the thermal stability of PA11, predominantly with 0.5% of silanized nanotubes, as observed by the thermogravimetric analysis. X-ray diffraction and differential scanning calorimetry analyses indicated that the degree of crystallinity of the formulations increased with the nanofiller content. On the other hand, the use of the highest concentration generated agglomerates, suggesting less dispersion in the matrix and, consequently, a reduction in crystallinity. Dynamic mechanical thermal analysis showed that the silanization process promoted an increase in both loss and storage moduli. All produced nanocomposites obtained values of corrected inherent viscosity above 1.20 dl/g, before and after the aging test. The use of lower load levels promoted better processability due to the lubricating effect of the nanotubes and an increase in the hydrophobic character of the samples, as observed by the increase of the contact angle.
机译：在这项工作中，研究了在聚合物基体中浓度为0.1%、0.5%和1.0 wt%的3-氨基丙基三甲氧基硅烷（APTMS）硅烷化，未经处理、氧化或表面改性的多壁碳纳米管（MWCNT）增强的市售聚酰胺-11纳米复合材料的制备和表征。纳米复合材料的加工是在熔融状态下，在双螺杆微型挤出机中，以200摄氏度、60转/分的螺杆转速、7分钟的停留时间进行的。通过热重分析观察，添加多壁碳纳米管提高了PA11的热稳定性，主要是0.5%的硅烷化纳米管。X射线衍射和差示扫描量热分析表明，配方的结晶度随着纳米填料含量的增加而增加。另一方面，使用最高浓度会产生团聚体，表明基质中的分散性减少，因此结晶度降低。动态机械热分析表明，硅烷化过程促进了损失模量和储存模量的增加。所有生产的纳米复合材料在老化试验前后的校正特性粘度值均高于1.20 dl/g。通过接触角的增加可以观察到，由于纳米管的润滑作用和样品疏水性的增加，使用较低的负载水平促进了更好的加工性能。

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