Journal
COLLOID AND POLYMER SCIENCE
Volume 292, Issue 2, Pages 281-289Publisher
SPRINGER
DOI: 10.1007/s00396-013-3068-9
Keywords
Single-walled carbon nanotubes (SWNTs); Pentablock terpolymer; Thermo-responsive; Dispersion
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Funding
- Distinguished Youth Fund of Sichuan Province [2010JQ0029]
- Natural Science Foundation of China [21173207, 21273223]
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Single-walled carbon nanotubes (SWNTs) were dispersed in pure water with a thermo-responsive amphiphilic PNIPAM(150)-F108-PNIPAM(150) pentablock terpolymer in comparison with its precursor PEO136-PPO45-PEO136 (F108) triblock copolymer. The stability, dispersibility, and thermo-responsive behaviors of the polymer/SWNT hybrids were characterized by UV-vis-NIR spectroscopy, thermal gravimetric analysis, viscosity measurement, Raman spectroscopy, and high-resolution transmission electron microscopy. The pentablock/SWNT hybrids showed superior ability in stabilization over F108/SWNT hybrids, and no sign of sedimentation was found at room temperature for 6 weeks or even 2 months of storage. The pentablock terpolymer can efficiently disperse SWNTs into individual tubes or small bundles with average diameter of about 5 nm, and their chains were helically wrapped onto the nanotube surface, whereas the larger bundles of the nanotubes with sizes of 15-25 nm were observed in F108/SWNT hybrids. Moreover, the pentablock/SWNT hybrids switched reversibly between the well-exfoliated and the aggregated states when cyclically increasing and decreasing temperature.
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