Biomedical Engineering Reference
In-Depth Information
Table 5.2
Assignment of the main IR bands (Fig.
5.5
)
of the cyanoacrylate monomers
Wavenumber (cm
−1
)
Assignment
3,128
=CH
2
st.
2,860-2,984
-CH
2
st., -CH
3
st.
2,238
-C≡N st.
1,731
-C=O st.
1,614
C=C st.
1,465
-CH
3
as st.
1,387
-CH
3
sim st.
1,447
-CH
2
bending
1,157-1,286
C-O-C st.
963
C=C bending
803
C=C-C-O st.
714
(CH
2
)
n
n
³ 4
st.
Stretching
Fig. 5.6
1
H NMR spectra of the cyanoacrylate monomers
NMR spectroscopy was used for more accurate assessment of the chemical
structure of the cyanoacrylate monomers. The
1
H NMR spectra (Fig.
5.6
) show the
typical signals of the protons in the cyanoacrylate monomers.
Table
5.3
shows as typical example the assignment of the protons of BCN mono-
mer. The intensity of the signals corresponding to the protons of the C=C bond in
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