Biomedical Engineering Reference
In-Depth Information
Figure 7.9
DSC traces of PC-4 (a) and the product obtained from PC-4
(b).
γ
O
O
β
PC-4 (m = 0); 0.84 nm
PC-8 (m = 4); 1.38 nm
PC-10 (m = 6); 1.65 nm
PC-12 (m = 8); 1.92 nm
O
O
O
O
m
x nm
Figure 7.10
Lengths of one unit of polycarbonates.
found to be 0.63, 0.77, 0.97, and 1.11, respectively. The integrated
ratio of these two signals in the
1
H NMR spectrum of the product
obtained using PC-4 was 0.65, which was in good agreement with
the calculated value. However, that of the product obtained using
PC-8 (0.55) was slightly smaller than the calculated value. However,
the values of the products obtained using PC-10 and PC-12 were
0.23 and 0.20, respectively, which were obviously lower than the
calculated values. The guest polycarbonates having longer methylene
chain lengths were probably aggregated in the aqueous bufer/
acetone mixed solvent, and accordingly, separated from the cavity of
amylose, causing the difficulty of complex formation.
