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Strengthening of liquid crystalline polymer by functionalized carbon nanotubes through interfacial interaction and homogeneous dispersion

机译：官能化碳纳米管通过界面相互作用和均匀分散增强液晶聚合物

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摘要

Multiwalled carbon nanotubes (MWCNTs) were functionalized with two types of chemical moieties (i.e. carboxylic, -COOH and hydroxyl benzoic acid groups, -HBA) on their sidewalls in order to improve their interaction with a liquid crystalline polymer (LCP) and dispersion in LCP. We have investigated the rheological, mechanical, dynamic mechanical, and thermal properties in detail with variation of HBA-functionalized MWCNTs in the LCP matrix. Effect of the dispersion state of the functionalized MWCNTs in the LCP matrix on the rheological behavior was also studied. The composites containing HBA-functionalized MWCNTs showed higher complex viscosity, storage, and loss modulus than the composites with the same loading of raw MWCNTs and MWCNT-COOH. It was suggested that the HBA-functionalized MWCNTs exhibited a better dispersion in the polymer matrix and formed stronger CNT-polymer interaction in the composites than the raw MWCNTs and MWCNT-COOH, which was also confirmed by FESEM and FTIR studies. As a result, the overall mechanical performance of the HBA-MWCNT-LCP composites could be improved significantly. For example, the addition of 4 wt% HBA-MWCNT to LCP resulted in the considerable improvements in the tensile strength and modulus of LCP (by 66 and 90%, respectively).
机译：多壁碳纳米管（MWCNT）在其侧壁上具有两种类型的化学部分（即羧基，-COOH和羟基苯甲酸基团-HBA）进行功能化，以改善其与液晶聚合物（LCP）的相互作用以及在LCP中的分散性。我们已经详细研究了LCP基质中HBA功能化的MWCNT的流变，机械，动态机械和热性能。还研究了功能化MWCNT在LCP基质中的分散状态对流变行为的影响。含有HBA-官能化MWCNT的复合材料比相同载量的MWCNT和MWCNT-COOH的复合材料具有更高的复数粘度，储能和损耗模量。有人认为，与未加工的MWCNT和MWCNT-COOH相比，HBA-官能化的MWCNT在聚合物基质中表现出更好的分散性，并在复合物中形成更强的CNT-聚合物相互作用，这也得到了FESEM和FTIR研究的证实。结果，可以显着改善HBA-MWCNT-LCP复合材料的整体机械性能。例如，向LCP中添加4重量％的HBA-MWCNT导致LCP的抗张强度和模量的显着改善（分别提高了66％和90％）。

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