1. (12 pts) You perform rheological assessment of a 200kDa polymer diluted in a solvent with a series of concentrations (% by mass), as seen below: G', G" 1000 100 G', G" 10 10 1 0.1 0.01 0.001 0.1 1 0.35% 0.5% 0.75% 1% 10 100 Ang frequency (rad/s) A) 6pts Explain why G' at high frequencies (ie, the rubbery plateau) increases with increasing mass concentration, as well as why the crossover frequency (green circles, where G'=G") shifts with increasing concentration. Include in your discussion polymer dynamics B) 6pts You find that using the same polymer at the half the molecular weight (100kDa) yields a higher rubbery plateau at the same mass concentration. Assuming both are still within the random coil regime, explain your results. Contrast these results with what happens in polymer melts (that is, pure polymer solutions with no solvent)