9 Polymeric Composite Films with Controlled Release of Natural Antioxidant Enoxil
159
Table 9.2
Thermal behavior parameters and characteristics of polymeric composites from DSC measurements
Samples
Gel/HEMA
Gel/Chit/HEMA
Gel/HEMA//VA
Gel/Chit/HEMA/VA
Gel/Chit
Gel/Chit/NT
Parameters
First heating scan from 20 to 100 ◦
C
T
endo , ◦
C
101
94
88
72/99
99
85
H,
J/g
99.8
62.7
77.4
125.8
33.1
52.8
Second heating scan from 20 to 450 ◦
C
T
endo , ◦
C
292
169/422
219/317
217
208
210
H,
J/g
–
4.9/9.4
20.2/−
34.4
25.1
48.2
T
exo , ◦
C
364
374
H,
J/g
144.3
–
T
c , ◦
C
162
299
299
290
297
ΔH
c ,
J/g
18.5
22.8
43.2
27.0
6.2
T
m , ◦
C
264
ΔH
m ,
J/g
12.6
T
g , ◦
C
98
83
98
92
81
C
p , J/g ◦
C
0.40
0.20
0.30
0.35
0.2
E
coh , kJ/mol
31.3
37.6
33.7
29.5
29.7
R,
C
p /T
g
182.5
280.0
233.3
214.3
350.0
Crystallization temperature T
c , heat of crystallization H
c , glass transition temperature T
g , heat capacity step at glass transition C
p , cohesion energy E
coh ,
thermal resistance R