Question 8
2 pts
What is the effect of degree of cross linking in a polvmer on its solution viscositv?
Viscosity will decrease with increase in cross linking
Viscosity will initially increase and then decrease with increase in cross linking showing an optimum cross linking for maximum viscosity
• Viscosity will increase with increase in cross linking
• Viscosity is not affected by degree of cross linking
Question 9
2 pts
You are working with a nonionic polymer with ethylene oxide groups in an aqueous solution
that is clouding out at room temnerature. You would like to Increase the cloud noint ov a tew
degrees. Which of the following techniques will you use to increase the cloud point?
O Increase pH from 5 to 7
O Increase polymer concentration
Add a salt such as sodium iodide with a high lyotropic number
Add salt such as sodium sulfate with a low lyotropic number
Question 10
2 pts
Which of the following salt will be most effective in forming an aqueous 2 phase system with
PEG polymers?
• Na2CO3
Na3 PO4|
NaOH
• Na2 SO4