Alam Javed, Khan Aslam, Alam Manawwer, Mohan Raja
King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
Research Center, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Materials (Basel). 2015 Sep 18;8(9):6391-6400. doi: 10.3390/ma8095313.
Shape memory polymer (SMP) nanocomposites with a fast electro-actuation speed were prepared by dispersing Cu-decorated carbon nanotubes (CNTs) (Cu-CNTs, 1 wt %, 2 wt %, and 3 wt %) in a polylactic acid (PLA)/epoxidized soybean oil (ESO) blend matrix The shape memory effect (SME) induced by an electrical current was investigated by a fold-deploy "U"-shape bending test. In addition, the Cu-CNT dispersed PLA/ESO nanocomposite was characterized by atomic force microscopy (AFM), dynamic mechanical analysis (DMA) and tensile and electrical measurements. The results demonstrated that the SME was dependent on the Cu-CNT content in the nanocomposites. When comparing the SMEs of the nanocomposite specimens with different Cu-CNT contents, the 2 wt % Cu-CNT dispersed system exhibited a shape recovery as high as 98% within 35 s due to its higher electrical conductivity that results from uniform Cu-CNT dispersion. However, the nanocomposites that contained 1 wt % and 3 wt % Cu-CNTs required 75 s and 63 s, respectively, to reach a maximum recovery level. In addition, the specimens exhibited better mechanical properties after the addition of Cu-CNTs.
通过将铜修饰的碳纳米管（Cu-CNTs，含量分别为1 wt%、2 wt%和3 wt%）分散在聚乳酸（PLA）/环氧大豆油（ESO）共混基体中，制备了具有快速电驱动速度的形状记忆聚合物（SMP）纳米复合材料。通过折叠展开“U”形弯曲试验研究了电流诱导的形状记忆效应（SME）。此外，采用原子力显微镜（AFM）、动态力学分析（DMA）以及拉伸和电学测量对Cu-CNT分散的PLA/ESO纳米复合材料进行了表征。结果表明，SME取决于纳米复合材料中Cu-CNT的含量。比较不同Cu-CNT含量的纳米复合材料试样的SME时，2 wt% Cu-CNT分散体系在35 s内表现出高达98%的形状恢复率，这归因于其均匀的Cu-CNT分散导致的较高电导率。然而，含有1 wt%和3 wt% Cu-CNTs的纳米复合材料分别需要75 s和63 s才能达到最大恢复水平。此外，添加Cu-CNTs后，试样表现出更好的力学性能。
