UV Radiation Induced Cross-Linking of Whey Protein Isolate-Based Films
Table 2
Mechanical properties of UV-treated WPI-based films as a function of UV dose and radiation time; significant differences are indicated by different letters .
UV-C dose (per side) [J/cm2]
Radiation time (per side) [min]
Young’s modulus
Tensile strength
Elongation at break [%]
0.0
0
69.8 ± 52.4
4.52 ± 0.75
23.7 ± 20.1
1.2
5
65.1 ± 15.7
4.32 ± 0.25
43.2 ± 19.7
2.8
10
65.7 ± 31.7
6.38 ± 0.57
42.6 ± 30.6
11.6
50
114.5 ± 44.3
7.39 ± 0.67
25.5 ± 7.0
19.9
100
112.8 ± 22.5
7.58 ± 0.51
30.7 ± 12.1
42.0
200
227.7 ± 149.5
13.61 ± 3.64
14.1 ± 9.1
Layer thicknesses in μm according to the increasing radiation time: 47.0 ± 8.2, 49.2 ± 9.3, 48.4 ± 8.0, 38.0 ± 5.7, 49.3 ± 9.9, and 37.5 ± 7.9.