Mechanical properties of the hydrogel: tensile strength, tensile strain, and modulus elasticity. The addition of GBM significantly increases the mechanical properties of the PVA-based hydrogel where PVA/GO shows the highest value.

Hydrogel	Tensile strength (MPa)	Tensile strain (%)	Modulus elasticity (MPa)
PVA	0.740 ± 0.030	459.42 ± 66.18	0.231 ± 0.049
PVA/Gr001	0.820 ± 0.114	520.17 ± 11.41	0.228 ± 0.042
PVA/Gr005	1.103 ± 0.220	436.45 ± 15.40	0.393 ± 0.072
PVA/GO	1.543 ± 0.040	508.68 ± 57.02	0.389 ± 0.033
PVA/Av	1.073 ± 0.015	438.31 ± 27.30	0.439 ± 0.025
PVA/Gr001/Av	1.213 ± 0.132	500.91 ± 17.00	0.341 ± 0.054
PVA/Gr005/Av	0.887 ± 0.150	397.57 ± 47.46	0.312 ± 0.021
PVA/GO/Av	1.123 ± 0.023	496.46 ± 30.34	0.331 ± 0.013