4.8 Article

Enhancement of Electrical Conductivity by Changing phase Morphology for Composites Consisting of Polylactide and Poly(ε-caprolactone) Filled with Acid-Oxidized Multiwalled Carbon Nanotubes

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 3, 期 12, 页码 4858-4864

出版社

AMER CHEMICAL SOC
DOI: 10.1021/am201355j

关键词

polylactide; multiwalled carbon nanotubes; composites; phase behavior; electrical conductivity

资金

  1. National Science Foundation of China [51073145]

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Composites consisting of polylactide (PLA) and poly(epsilon-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-MANCNT composite with PLA/PCL ratio of 60/40. The result is well-explained by the formed cocontinuous phase morphology and effective A-MWCNT content.

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