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- Title
Strengthening of liquid crystalline polymer by functionalized carbon nanotubes through interfacial interaction and homogeneous dispersion.
- Authors
Sahoo, Nanda Gopal; Cheng, Henry Kuo Feng; Pan, Yongzheng; Li, Lin; Chan, Siew Hwa; Zhao, Jianhong
- Abstract
Multiwalled carbon nanotubes (MWCNTs) were functionalized with two types of chemical moieties (i.e. carboxylic, COOH and hydroxyl benzoic acid groups, -HBA) on their sidewalls in order to improve their interaction with a liquid crystalline polymer (LCP) and dispersion in LCP. We have investigated the rheological, mechanical, dynamic mechanical, and thermal properties in detail with variation of HBA-functionalized MWCNTs in the LCP matrix. Effect of the dispersion state of the functionalized MWCNTs in the LCP matrix on the rheological behavior was also studied. The composites containing HBA-functionalized MWCNTs showed higher complex viscosity, storage, and loss modulus than the composites with the same loading of raw MWCNTs and MWCNT-COOH. It was suggested that the HBA-functionalized MWCNTs exhibited a better dispersion in the polymer matrix and formed stronger CNT-polymer interaction in the composites than the raw MWCNTs and MWCNT-COOH, which was also confirmed by FESEM and FTIR studies. As a result, the overall mechanical performance of the HBA-MWCNT-LCP composites could be improved significantly. For example, the addition of 4 wt% HBA-MWCNT to LCP resulted in the considerable improvements in the tensile strength and modulus of LCP (by 66 and 90%, respectively). Copyright © 2010 John Wiley & Sons, Ltd.
- Subjects
CARBON nanotubes; POLYMER liquid crystals; RHEOLOGY; ADHESION; BENZOIC acid; SHEAR (Mechanics)
- Publication
Polymers for Advanced Technologies, 2011, Vol 22, Issue 10, p1452
- ISSN
1042-7147
- Publication type
Article
- DOI
10.1002/pat.1704