Sol solution

Sol color

Dried gel

C (%)

H (%)

N (%)

(a)

Milky yellow (gelation)

18.4

4.9

21.5

(b)

Yellow transparent

14.4

3.5

0.0

(c)

Milky white (gelation)

18.0

4.8

17.0

(d)

Clear transparent

13.5

3.4

0.0