Shape memory polymer nanocomposites based on thermoplastic polyurethane (TPU)/polylactic acid (PLA) blends filled with pristine multi‐walled carbon nanotubes (MWCNTs) and modified MWCNTs─COOH were fabricated by direct melt blending technique and investigated for its morphology, mechanical, thermal, electrical, and shape memory properties. Morphological characterizations by using transmission electron microscope (TEM) and field emission scanning electron microscope (FESEM) revealed better dispersion of MWCNTs─COOH in the polymer blend, which is attributed to the improved interfacial interactions between the polymer blends and MWCNTs‐COOH. Loading of the MWCNTs‐COOH in the TPU/PLA blends resulted in the significant improvements in the mechanical properties such as tensile strength and elastic modulus and these effects are more pronounced on increasing the MWCNTs─COOH loading amount, when compared to the pristine MWCNTs filled system. Thermal analysis showed that the glass transition temperature of the blends increases slightly with increasing loading of both pristine and modified MWCNTs in the system. The resistance of nanocomposites decreased from 2 × 10¹² Ω to 3.2 × 10¹⁰ Ω after adding 3% MWCNTs─COOH. The shape memory performance tests showed that the enhancement of shape recovery by 252% could be achieved at 3% MWCNTs loading, when compared to that of TPU/PLA blends.

中文翻译：

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TPU / PLA纳米复合材料具有改善的机械性能和形状记忆性能，可通过相态形态控制和多壁碳纳米管纳米填料的掺入来制造

通过直接熔融共混技术制备了以热塑性聚氨酯（TPU）/聚乳酸（PLA）共混物为原料的多壁碳纳米管（MWCNT）和改性多壁碳纳米管（COOH）填充的形状记忆聚合物纳米复合材料，并对其形态，力学，热学性能进行了研究。 ，电气和形状记忆属性。使用透射电子显微镜（TEM）和场发射扫描电子显微镜（FESEM）进行的形态表征表明，MWCNTs-COOH在聚合物共混物中的分散性更好，这归因于聚合物共混物与MWCNTs-COOH之间的界面相互作用得到了改善。MWCNTs-COOH在TPU / PLA共混物中的负载显着改善了机械性能，如拉伸强度和弹性模量，与原始MWCNT填充相比，这些影响在增加MWCNTs-COOH负载量上更为明显系统。热分析表明，共混物的玻璃化转变温度随系统中原始和改性MWCNT的负载增加而略有增加。纳米复合材料的电阻从2×10降低¹²  Ω到3.2×10 ¹⁰  Ω加入3％MWCNTs─COOH之后。形状记忆性能测试表明，与TPU / PLA混合物相比，在3％MWCNT负载下，形状恢复率可提高252％。