Dramatic Enhancement of Carbon Nanotube Dispersion in Polyimide
Composites by a Two-Step Amino Functionalization Approach
Yaqin Chen, Baoping Lin, Hong Yang, Ying Sun, Xueqin Zhang
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
Correspondence to: Baoping Lin (E-mail: lbp@seu.edu.cn)
Figure S1. 1H NMR (300 MHz, CDCl3) of Boc-ODA δ 1.51 (s, 9H), δ 3.3-3.8 (m, 2.6H), δ 6.3-6.9
(m, 8H)
Figure S2. FT-IR spectra of Boc-ODA
Figure S3. High resolution XPS spectra of the as-obtained nanotubes: a) purified MWNTs,
atomic ratio of C, N and O is 92.04%, 0.38% and 7.58%. b) MWNT-COOHs, atomic ratio of C,
N and O is 84.25%, 0.54% and 15.21%. c) Boc-MWNTs, atomic ratio of C, N and O is 90.48%,
0.64% and 8.88%. d) NH2-MWNTs, atomic ratio of C, N and O is 89.17%, 0.99% and 9.84%. e)
Di-MWNTs, atomic ration of C, N and O is 86.91%, 1.14% and 11.95%.
Figure S4. SEM images of 5.0 wt% NH2-MWNT/PI composite film