Biomedical Engineering Reference
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for the formation of epoxide groups. The carboxylic peak disappeared after annealing
the modifi ed CNTs in N
2
.
Recently, Kong
et al.
[159] functionalized MWNT with polyacrylic acid (PAA) and
poly(sodium 4-styrenesulfonate) (PSS) by surface-initiating ATRP (atom transfer radi-
cal polymerization) following the Schemes 1 and 2:
1133
1569
1176
(c)
1176
1733
1574
1660
1281
1448
(b)
855
1152
1569
(a)
2000
1800
1600
1400
1200
1000
800
600
Wavenumber (cm
1
)
FIGURE 15.25
IR spectra of SWNTs: (a) p-SWNTs, (b) after peroxytrifl uoroacetic acid treatment, and
(c) N
2
annealing after treatment. (Reprinted with permission from [158]. Copyright (2005) Elsevier.)
O
CF
3
COOH
O
O
O
Br
O
CuBr/PMDETA
60C, 48 h
n
Br
O
O
O
n
Br
O
O
O
O
24 h
O
O
O
O
OH
O
MWNT-Br
t
BA
MWNT-PAA
MWNT-P
t
BA
Scheme 1
O
O
O
O
O
Br
Br
O
O
CuBr/PMDETA
130C, 30 h
O
n
SO
3
Na
SO
3
Na
NaSS
MWNT-Br
MWNT-PSS
Scheme 2
SCHEMES 1 AND 2
(Reprinted with permission from [159]. Copyright (2005) Elsevier.)
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