In a second study, a student decided to use solvent vapors instead of immersing the PDMS rods into the solvent. They also used volume (Sv) and weight (Sw) instead of using length to capture the swelling of PDMS rods. They obtained the data below. a. Make a plot of Hansen solubility parameter vs each of the three parameters and deduce which one is better at measuring polymer swelling. (15 points) b. Compare the plots in 2a to those in 3a and justify which of the two methods is better for studying solvent effects on polymers (10 pts) c. Given that the PDMS is already cross-linked what is the molecular origin of the swelling behavior?
A. Hansen solubility parameter vs Volume (Sv)
B. Hansen solubility parameter vs Weight (Sw)
C. Hansen solubility parameter vs Length
D. Unable to determine