Wheat Gluten-Laminated Paperboard with Improved Moisture Barrier Properties: A New Concept Using a Plasticizer (Glycerol) Containing a Hydrophobic Component (Oleic Acid)

Table 2

Mechanical properties of the uncoated and laminated paperboard.

Sample	E-modulus (GPa)	Strain at break (%)	Stress at break (MPa)	Energy at break (mJ/mm^2)	Thickness (mm)
Paperboard	2.50±0.10 de*	4.1±0.4 a	26.5±1.8 bc	30.6±4.0 a	0.40±0.01
20-OA0	3.24±0.15 c	1.5±0.1 d	25.2±2.6 c	9.5±1.4 cd	0.59±0.02
20-OA25	3.64±0.16 b	1.5±0.1 d	29.2±2.6 ab	10.6±1.5 cd	0.55±0.01
20-OA50	4.00±0.19 a	1.4±0.1 d	32.3±2.4 a	11.1±1.6 cd	0.54±0.03
20-OA75	2.61±0.09 d	2.9±0.3 c	9.1±1.5 f	11.9±1.8 c	0.63±0.02
30-OA0	3.11±0.12 c	1.4±0.1 d	21.8±1.8 d	7.7±1.2 d	0.57±0.01
30-OA25	3.51±0.19 b	1.4±0.1 d	26.0±2.6 c	8.8±1.0 cd	0.51±0.02
30-OA50	3.94±0.23 a	1.3±0.1 d	27.2±2.7 bc	7.1±2.8 d	0.49±0.01
30-OA75	2.32±0.06 e	3.7±0.4 b	18.0±1.5 e	20.8±3.9 b	0.50±0.01

Sample notation: wt.% plasticizer-OA (wt.% oleic acid in the plasticizer mixture).
*The values connected with the same letters are not significantly different. Statistics was carried out using the Tukey-Kramer HSD test at a significance level of 0.05.