Investigation on the Effect of Butyl Acrylate (nBA) to Improve the Toughness Properties of Methacrylate-Based Waterproofing Adhesive Material (MMA) for the Steel Bridge Deck

Table 2

Cohesive energy density of equilibrated (CEDeq), van der Waals (vdW) density, free volume (FV), density (ρ), and solubility parameter (δ) as a function of MMA-r-nBA molar ratios.

MMA-r-nBA molar ratio	Density (kg/m^3)	CEDeq (105 kJ/m^3)	vdW density (105 kJ/m^3)	Δ (J/m^3)1/2	FV (Å)
100/0	1.106	2.029	1.744	14.103	5907.46
70/30	1.008	2.093	1.815	14.466	6436.50
55/45	1.003	1.992	1.762	14.113	5265.87
50/50	1.027	2.112	1.855	14.532	5118.32
45/55	1.042	1.98	1.727	14.006	5100.43
40/60	1.035	2.135	1.881	14.612	4306.58
30/70	1.002	1.923	1.714	13.862	6233.73
0/100	1.018	1.712	1.527	12.941	5561.97