. 2021 Jun 16;22(7):2935–2953. doi: 10.1021/acs.biomac.1c00353

Table 6. Mechanical Properties of the Electrospun Biopapers of Commercial and Cheese Whey (CW)-Derived Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with 3-Hydroxyvalerate (3HV) Contents of 20 mol % (PHBVCW20), 40 mol % (PHBVCW40), and 60 mol % (PHBVCW60) in Terms of Tensile Modulus (E), Tensile Strength at Yield (σ_y), Elongation at Break (ε_b), and Toughness (T)^b.

biopaper	E (MPa)	σ_y (MPa)	ε_b (%)	T (mJ/m³)
commercial PHBV2^a	1252 ± 79^a	18.1 ± 2.1^a	2.4 ± 0.3^a	0.3 ± 0.1^a
PHBVCW20	714 ± 92^b	12.4 ± 0.9^b	10.5 ± 2.1^b	0.8 ± 0.1^b
PHBVCW40	728 ± 83^b	12.2 ± 1.2^b	18.3 ± 2.7^c	1.6 ± 0.3^c
PHBVCW60	402 ± 97^c	8.4 ± 1.8^c	14.3 ± 4.0^b,c	0.9 ± 0.2^b

Data reported in a previous study.⁸⁴

Different letters (a–d) in the same column indicate a significant difference among the samples (p < 0.05).