Effects of Lignin-Derived Polycarboxylic Acids on the Properties of Waterborne Polyurethane Elastomers

Table 4

Tensile stress at 100% strain (σ₁₀₀), tensile stress at 300% strain (σ₃₀₀) and modulus of elasticity in tension (E_t) of LPCA-WPU elastomers with different loadings of LPCAs.

LPCA loading	σ 100 (MPa)	σ 300 (MPa)	E t (MPa)
0 wt%	2.96 ± 0.12	5.16 ± 0.07	22.2 ± 1.6
1.0 wt%	5.02 ± 0.32	7.49 ± 0.49	65.5 ± 4.8
1.5 wt%	5.09 ± 0.27	7.61 ± 0.58	61.1 ± 5.8
2.5 wt%	6.97 ± 0.37	9.83 ± 0.49	107.1 ± 6.1
5.0 wt%	5.26 ± 0.36	7.78 ± 0.35	88.5 ± 5.8
7.5 wt%	3.95 ± 0.30	6.27 ± 0.30	51.8 ± 7.0