University of Hertfordshire

By the same authors


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  • Li Qiu
  • Yong Chen
  • Yongzhen Yang
  • Lihua Xu
  • Xuguang Liu
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Original languageEnglish
Article number252417
Number of pages8
JournalJournal of Nanomaterials
Publication statusPublished - 29 Oct 2013


The effects of surface modification of carbon nanotube on the properties of polyamide 66/multiwalled carbon nanotube composites have been investigated. Polyamide 66 (PA66) and multiwalled carbon nanotubes (MWCNTs) composites were prepared by melt mixing. The surfaces of MWCNTs were modified with acid- and amine-groups. Field emission scanning electron microscopy analyses revealed that amine-MWCNTs(D-MWCNTs) dispersed better in the PA66 matrix than pristine- and acid-MWCNTs. However, an introduction of D-MWCNTs into PA66 matrix induced heterogeneous nucleation and affected the crystal growth process during the crystallization of PA66/MWCNTs composites. Both nano-indentation and friction analyses were carried out in a study of the effect of the introduction of modified MWCNTs on both mechanical and friction properties of the composites. With the introduction of D-MWCNTs, both nano-hardness and elastic modulus of the composites were significantly improved but it was observed that the maximum depth, nano-hardness and elastic modulus of the composites showed no distinct change before and after a friction test. It is evident that PA66/D-MWCNTs composites have the least friction coefficient of the PA66/MWCNTs composites of all the approaches of carbon nanotube surface modification.


Copyright © 2013 Li Qiu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

ID: 2299029