Table 3.

Tensile modulus, mesh size and swelling properties of PEGDA-NVP/I651 hydrogels

	Concentration [% w/w]	Tensile Modulus € [kPa]	Mesh Size (ξ) [nm] 34	Q	Q*	Crosslink Density (ρx) [mol/L]
3.4 kDa PEGDA	5	41.5 ± 2.7	38.5 ± 0.7	18.37 ± 0.39	18.0 ± 0.38	1.227 ± 0.015
	10	131.5 ± 7.2	17.2 ± 0.3	9.91 ± 0.07	9.39 ± 0.09	1.847 ± 0.009
	15	221.6 ± 6.2	10.1 ± 0.7	7.93 ± 0.06	7.18 ± 0.06	2.183 ± 0.016
	20	332.6 ± 19.0	8.3 ± 0.5	6.68 ± 0.06	5.14 ± 0.06	2.274 ± 0.017
	25	412.5 ± 7.6	7.2 ± 0.4	6.21 ± 0.06	4.27 ± 0.03	2.240 ± 0.038
	30	454.4 ± 38.2	6.4 ± 0.4	5.74 ± 0.09	3.51 ± 0.09	2.236 ± 0.023
6.0 kDa PEGDA	5	31.7 ± 0.7	37.8 ± 1.0	19.39 ± 0.46	18.56 ± 0.43	0.889 ± 0.016
	10	98.8 ± 4.3	17.8 ± 0.2	10.96 ± 0.10	9.67 ± 0.14	1.324 ± 0.008
	15	157.2 ± 5.2	12.2 ± 0.1	8.94 ± 0.07	6.37 ± 0.53	1.347 ± 0.090
	20	208.3 ± 8.4	9.9 ± 0.2	7.92 ± 0.08	5.05 ± 0.05	1.395 ± 0.017
	25	251.7 ± 7.9	8.8 ± 0.1	7.38 ± 0.10	4.13 ± 0.04	1.361 ± 0.026
	30	285.1 ± 12.9	7.9 ± 0.1	6.81 ± 0.19	3.39 ± 0.09	1.367 ± 0.041
10.0 kDa PEGDA	5	23.8 ± 1.4	35.4 ± 0.6	20.72 ± 0.42	18.00 ± 0.42	0.646 ± 0.009
	10	68.9 ± 3.4	20.7 ± 0.7	13.77 ± 0.05	10.16 ± 0.34	0.794 ± 0.005
	15	117.5 ± 15.5	15.1 ± 0.2	11.60 ± 0.03	7.04 ± 0.05	0.801 ± 0.004
	20	160.6 ± 4.73	13.3 ± 0.1	10.27 ± 0.02	5.30 ± 0.01	0.806 ± 0.008
	25	190.7 ± 11.9	11.4 ± 0.1	9.31 ± 0.04	4.22 ± 0.02	0.806 ± 0.008
	30	223.2 ± 10.6	10.2 ± 0.1	8.61 ± 0.02	3.52 ± 0.01	0.811 ± 0.001
20.0 kDa PEGDA	5	14.4 ± 0.4	36.5 ± 0.3	29.77 ± 0.21	20.64 ± 0.06	0.326 ± 0.004
	10	33.2 ± 3.3	26.9 ± 0.2	20.43 ± 0.24	10.75 ± 0.10	0.365 ± 0.005
	15	51.9 ± 3.1	21.6 ± 0.3	16.50 ± 0.05	7.30 ± 0.03	0.381 ± 0.001
	20	70.2 ± 5.0	18.0 ± 0.2	14.86 ± 0.17	5.47 ± 0.02	0.382 ± 0.007
	25	89.2 ± 8.0	15.5 ± 0.2	12.94 ± 0.21	4.33 ± 0.02	0.390 ± 0.008
	30	108.2 ± 4.1	14.2 ± 0.1	11.97 ± 0.18	3.54 ± 0.02	0.402 ± 0.009

Q is the volumetric swelling ratio at equilibrium, Q* is the volumetric swelling ratio in the relaxed state before equilibrium and ρ_x is the crosslink density estimated using the swelling data as follows: ${\rho }_x=\frac{1}{M_c\ast \overline{v}}$, where M_c and ν̄ are the average molecular weight between crosslinks and ν̄ is the specific volume of the polymer respectively.