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首页> 外文期刊>RSC Advances >Largely reinforced polyurethane via simultaneous incorporation of poly(lactic acid) and multiwalled carbon nanotubes
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Largely reinforced polyurethane via simultaneous incorporation of poly(lactic acid) and multiwalled carbon nanotubes

机译：通过同时掺入聚乳酸和多壁碳纳米管，大大增强聚氨酯

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In this study, we simultaneously introduced both poly(lactic acid) (PLA) and multiwalled carbon nanotubes (CNTs) into the polyurethane (PU) matrix via melt blending, to achieve balanced mechanical properties and good conductivity. Different contents of PLA (0-30 wt%) and CNTs (0-3.0 wt%) were used in this work. A significant improvement in tensile strength at 300% strain and Young's modulus were observed, which could not be obtained by incorporating either PLA or CNTs with PU separately. Particularly, the ternary composites containing a large amount of PLA (30 wt%), 70PU/30PLA/CNTs composites, exhibit superior mechanical properties compared to other composites with less PLA content but the same amounts of CNTs. Moreover, the ternary composites showed better electrical conductivity compared with the binary counterpart. SEM observations demonstrated that PLA particles and CNTs are separately dispersed in the PU matrix. It was found that PLA particles remain spherical and their size increases with increasing PLA content up to 30 wt%, while a network structure of CNTs is formed with increasing its content, which was also confirmed via dynamic rheological analysis. Interestingly, some CNTs were seen to be located in the interfaces between PLA particles and the PU matrix for 70PU/30PLA/CNTs composites, namely, some CNTs exhibit a nano-bridge effect between PU and PLA. We hypothesized that the nano-bridge structure of CNTs in the composites could mainly contribute to the observed enhancement of mechanical properties and electrical conductivity.
机译：在这项研究中，我们同时通过熔融共混将聚乳酸（PLA）和多壁碳纳米管（CNT）引入聚氨酯（PU）基体中，以实现平衡的机械性能和良好的导电性。在这项工作中使用了不同含量的PLA（0-30 wt％）和CNT（0-3.0 wt％）。观察到在300％应变下的拉伸强度和杨氏模量有显着提高，这是通过将PLA或CNT与PU单独结合无法实现的。特别地，与具有较少PLA含量但相同数量的CNT的其他复合物相比，包含大量PLA（30wt％），70PU / 30PLA / CNTs复合物的三元复合物表现出优异的机械性能。此外，与二元复合物相比，三元复合材料显示出更好的导电性。 SEM观察表明，PLA颗粒和CNT分别分散在PU基质中。发现PLA颗粒保持球形，并且其尺寸随着PLA含量的增加而增加，直至30wt％，而CNT的网络结构随着其含量的增加而形成，这也通过动态流变分析证实。有趣的是，对于70PU / 30PLA / CNTs复合材料，一些CNT被发现位于PLA颗粒和PU基质之间的界面，即，某些CNT在PU和PLA之间表现出纳米桥效应。我们假设，复合材料中碳纳米管的纳米桥结构可能主要有助于观察到的机械性能和导电性的增强。

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