期刊
POLYMER TESTING
卷 51, 期 -, 页码 40-48出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2016.02.008
关键词
Poly(epsilon-caprolactone); Carbon nanotube; Percolation threshold; Nanocomposite; Conductivity
资金
- Natural Science Foundation Project of Chongqing [CSTC2013JCYJA20017]
- Fundamental Research Funds for the Central Universities [XDJK2015C022, SWU115006]
Multi-walled carbon nanotubes (MWCNTs) were modified via a non-covalent functionalization technique with poly(sodium 4-styrenesulfonate) (PSS) as the modifier. A well dispersed and stable water dispersion of carbon nanotubes was prepared by ultrasonication of aqueous suspension of MWCNTs in the presence of PSS. Successful wrapping of MWCNTs by PSS was confirmed by High resolution transmission electron microscope (HRTEM). The dispersion was used to fabricate nanocomposites with poly(epsilon-caprolactone) (PCL) through solution coagulation. Scanning electron microscope (SEM) and transmission electron microscope (TEM) indicate that PSS wrapped MWCNTs dispersed uniformly in PCL matrix without obvious aggregation even with MWCNT loading increased up to 1.0 wt%. Rheological investigation confirmed that rheological network existed in the PCL/MWCNT nanocomposites with the percolation threshold of only 0.3 wt%. The electrical conductivity of the composites was investigated and the results indicate that electrical percolation threshold was also 0.3 wt%. The mechanical properties of PCL were significantly reinforced as evidenced by the improvement in yielding strength, Young's modulus, and dynamic storage modulus with incorporation of PSS wrapped MWCNTs. (C) 2016 Elsevier Ltd. All rights reserved.
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