Comparative Properties of Ethyl, n -Butyl, and n -Octyl Cyanoacrylate Bioadhesives Intended for Wound Closure - Biologically Responsive Biomaterials for Tissue Engineering - page 100

0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04

2988

2943
2910

3128

ECN Monomer

2988

0.02

2944

0.00

2908

-0.02

ECN Poloymer

-0.04

3400 3200 3000 2800

Wavenumber(cm -1 )

0.85

1737

0.80

1291

0.75 1192

0.70

0.65

1388

0.60

1320

0.55

1240

1738

1021

0.50

1408

0.45

989 804

868
839

1113

1371

0.40

1097

1615

ECN Monomer 1447

1011

0.35 714

2239

937

0.30

1156

0.25 856

0.20

1443
1371

1110

0.15

ECN Poloymer 1471

0.10

805
745

0.05

0.00

-0.05

2000 1500 1000

Wavenumber(cm -1 )

Fig. 5.10 Selected regions in the ATR-IR spectra of the ethyl cyanoacrylate monomer and polymer

cyanoacrylate is produced throughout these C=C bonds [ 1 ] . Furthermore, after
polymerization of the ECN the intensity of the CH 3 group decreases.
The thermal properties of the cyanoacrylate polymers also differ from those of
the corresponding monomers. Figure 5.11a shows as typical example the TGA ther-
mograms of the BCN monomer and polymer. After polymerization the degradation
temperature of the cyanoacrylate increases noticeably and the percentages of the
two different structures found in the TGA of the monomer (Fig. 5.8a ) change and
almost similar content is obtained. The different polymer structures can be better
distinguished in the derivative curves of the TGA thermograms given in Fig. 5.11b .
Table 5.6 summarizes the weight loss and temperature of the different thermal
decompositions of the ethyl, n -butyl, and n -octyl cyanoacrylate polymers. In general,