Mechanical parameters of S1, S3, S4, S5 and S10.

Sample	Tensile strength (MPa)	Elongation at break (%)	Density (g cm−3)	Modulus (MPa)	Crosslink density (10−3 mol kg−1)
S1	0.38	222	0.89	0.28	0.79
S3	0.86	276	0.95	0.34	1.35
S4	0.47	134	1.01	0.51	1.45
S5	0.46	116	1.01	0.56	1.63
S10	0.27	89	0.93	0.43	—