Properties characterisation of polycarbonate and multi-walled carbon nanotubes composites prepared by solution technique

Thaithae, Wachirawut, Antonio, Christian and Wattanachai, Piyachat (2016) Properties characterisation of polycarbonate and multi-walled carbon nanotubes composites prepared by solution technique. Asia-Pacific Journal of Chemical Engineering, 11 1: 34-50. doi:10.1002/apj.1940


Author Thaithae, Wachirawut
Antonio, Christian
Wattanachai, Piyachat
Title Properties characterisation of polycarbonate and multi-walled carbon nanotubes composites prepared by solution technique
Journal name Asia-Pacific Journal of Chemical Engineering   Check publisher's open access policy
ISSN 1932-2143
1932-2135
Publication date 2016-01-01
Year available 2015
Sub-type Article (original research)
DOI 10.1002/apj.1940
Open Access Status Not Open Access
Volume 11
Issue 1
Start page 34
End page 50
Total pages 17
Place of publication Chichester, West Sussex United Kingdom
Publisher John Wiley & Sons
Collection year 2016
Language eng
Formatted abstract
Polycarbonate (PC) and multi-walled carbon nanotubes (MWNTs) composites were prepared by solution method where 0–20% w/w MWNTs were added into two types of PC solutions, i.e. a low and a high molecular weight solution. The composites were processed into plastic sheets using a compression moulding technique in order to study their mechanical, electrical, physical, and rheological properties. The results showed that addition of MWNTs at 1% w/w enhanced the tensile strength and modulus by up to 23 and 75%, respectively, and reduced their electrical resistivity significantly from being an insulator (1 × 1016 − 1 × 1017 Ω-cm) to a semi-conductor (8 × 108 Ω-cm), indicating a percolation threshold. A slight improvement in the mechanical properties was observed at up to 4% w/w MWNTs; however, the volume resistivity remained unchanged. As the amount of MWNTs increased >4% w/w, the mechanical properties drastically deteriorated because of the MWNTs agglomerating and segregating onto the surfaces. The segregation of the agglomerates was also supported by the surface resistivity and shear viscosity results, which decreased as MWNTs increased. MWNTs were found to interact better with the low molecular weight PC matrix and produced more homogeneous composites. The studies of composite colour and MWNTs dispersion confirmed the findings of both mechanical and electrical properties. This research demonstrates the possibility of preparation of PC and MWNTs composites at high MWNTs concentrations, which can be very useful for a master batch process.
Keyword Carbon nanotube
Polycarbonate
Composite
Electrical resistivity
Dispersion
Percolation threshold
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Official 2016 Collection
 
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