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首页> 外文期刊>RSC Advances >Super toughened immiscible polycarbonate/poly(L-lactide) blend achieved by simultaneous addition of compatibilizer and carbon nanotubes
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Super toughened immiscible polycarbonate/poly(L-lactide) blend achieved by simultaneous addition of compatibilizer and carbon nanotubes

机译：通过同时添加相容剂和碳纳米管获得超增韧的不溶混的聚碳酸酯/聚（L-丙交酯）共混物

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Polycarbonate/poly(L-lactide) (PC/PLLA) blend exhibits great potential application in several fields, including package, toy, electronic element and automobile. However, the poor mechanical properties of the immiscible PC/PLLA blend restrict its application. In this work, a compatibilizer maleic anhydride grafted ethylene-octene copolymer (EOR-g-MAH) and functionalized carbon nanotubes (F-CNTs) were introduced into the immiscible PC/PLLA blend by simple melt-compounding processing. Mechanical property measurements showed that even at low environmental temperature (0 degrees C), the blend composites exhibited excellent fracture toughness, e.g. 40.9 +/- 2.1 kJ m(-2) at F-CNT content of 2 wt%. To better understand the toughening mechanism, the morphologies of the blend composites and the dispersion of F-CNTs and the rheological properties were systematically investigated. The results showed that with the combined effects of EOR-g-MAH and F-CNTs, the decreased PLLA particles were achieved. Most of F-CNTs selectively located in the PC matrix and some F-CNTs entered into PLLA particles. Specifically, at relatively high content (>2 wt%), F-CNTs formed percolated network structure. Then, the toughening mechanism was proposed on the basis of the morphology evolution, the formation of F-CNT network structure and the impact-fractured surface morphologies. This work demonstrated that even for the immiscible polymer blend, the super toughened blend composites could be achieved by the combined effects of compatibilizer and carbon nanotubes, and therefore it provides an alternative strategy for largely improving the fracture toughness of immiscible polymer blends.
机译：聚碳酸酯/聚（L-丙交酯）（PC / PLLA）混合物在包装，玩具，电子元件和汽车等多个领域具有巨大的应用潜力。但是，不相容的PC / PLLA混合物的机械性能差，限制了其应用。在这项工作中，通过简单的熔融复合工艺将相容剂马来酸酐接枝的乙烯-辛烯共聚物（EOR-g-MAH）和官能化的碳纳米管（F-CNT）引入到不混溶的PC / PLLA共混物中。力学性能测量表明，即使在较低的环境温度（0℃）下，共混复合物也显示出优异的断裂韧性，例如。 F-CNT含量为2 wt％时为40.9 +/- 2.1 kJ m（-2）。为了更好地了解增韧机理，系统地研究了共混复合物的形态，F-CNT的分散性和流变性能。结果表明，在EOR-g-MAH和F-CNT的共同作用下，PLLA颗粒减少。大多数F-CNT选择性地位于PC基质中，一些F-CNT进入PLLA颗粒。具体地，在相对较高的含量（> 2重量％）下，F-CNT形成渗透的网络结构。然后，根据形貌演变，F-CNT网络结构的形成和冲击断裂表面形貌，提出了增韧机理。这项工作表明，即使对于不混溶的聚合物共混物，也可以通过增容剂和碳纳米管的联合作用来实现超增韧的共混物，因此，它为大幅提高不混溶的聚合物共混物的断裂韧性提供了另一种策略。

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