CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui Province 230026, PR China.
ACS Appl Mater Interfaces. 2011 Dec;3(12):4858-64. doi: 10.1021/am201355j. Epub 2011 Dec 7.
Composites consisting of polylactide (PLA) and poly(ε-caprolactone) (PCL) filled with acid-oxidized multiwalled carbon nanotubes (A-MWCNTs) were prepared through melt compounding. Phase morphologies of PLA/PCL/A-MWCNT composites with different contents of filled A-MWCNTs and PCL compositions were mainly observed by scanning electron microscope. The results show that A-MWCNTs are selectively dispersed in the PCL phase, regardingless of PCL phase domain sizes. For PLA/PCL/A-MWCNT composites with fixed PLA/PCL ratio of 95/5, the dispersed PCL phase domain sizes in the PLA matrix decrease even though a small content of A-MWCNTs is added, compared with PLA/PCL blend with the same composition, indicating that A-MWCNTs effectively prevent from coalescence of the dispersed PCL phase domains. With filling of 1.0 wt % A-MWCNTs, an interesting change of electrical conductivity for PLA/PCL/A-MWCNT composites is observed, in which the maximum conductivity is observed for PLA/PCL/A-MWCNT composite with PLA/PCL ratio of 60/40. The result is well-explained by the formed cocontinuous phase morphology and effective A-MWCNT content.
由聚乳酸（PLA）和聚（ε-己内酯）（PCL）组成的复合材料填充了酸氧化多壁碳纳米管（A-MWCNTs），通过熔融共混制备。通过扫描电子显微镜主要观察了不同填充 A-MWCNTs 含量和 PCL 组成的 PLA/PCL/A-MWCNT 复合材料的相形态。结果表明，A-MWCNTs 选择性分散在 PCL 相中，而与 PCL 相畴尺寸无关。对于 PLA/PCL/A-MWCNT 复合材料，固定 PLA/PCL 比为 95/5，与具有相同组成的 PLA/PCL 共混物相比，即使添加少量 A-MWCNTs，分散在 PLA 基质中的 PCL 相畴尺寸也会减小，表明 A-MWCNTs 有效地阻止了分散的 PCL 相畴的聚集。在填充 1.0wt% A-MWCNTs 的情况下，观察到 PLA/PCL/A-MWCNT 复合材料的电导率发生了有趣的变化，其中 PLA/PCL 比为 60/40 的 PLA/PCL/A-MWCNT 复合材料具有最大的电导率。这一结果通过形成的共连续相形态和有效的 A-MWCNT 含量得到了很好的解释。
