Question 1

Which of the following is the best initiator for an anionic polymerization?

Accepted Answer

A)  BuLi 
B)  PhOH 
C)  (PhCO2)2 
D)  CH3CH(OCH3)2 
E)  BF3

Question 2

What name is given to nonvolatile liquids that dissolve in polymers and thus lower the attractions between the polymers' chains?

Accepted Answer

The answer of What name is given to nonvolatile liquids...

Question 3

Plexiglas is a:

Accepted Answer

A)  polyamide. 
B)  polyester. 
C)  polycarbonate. 
D)  polyurethane. 
E)  none of the above

Question 4

Above Tm, crystalline polymers exist as ________.

Accepted Answer

A)  thermoplastics which are flexible and moldable 
B)  liquids which are flexible and moldable 
C)  glasses of low flexibility 
D)  thermoplastics which are readily extruded to form fibers 
E)  liquids which are readily extruded to form fibers

Question 5

Poly(lactic acid) is a biodegradable polymer that is used in 3D printing. It can be made through the polymerization of L-lactic acid (below). Draw three repeat units of the polymer that is formed with the appropriate stereochemistry.

Accepted Answer

The answer of Poly(lactic acid) is a biodegradable polymer that...

Question 6

Draw the structure of the polymer produced in the following reaction.

Accepted Answer

The answer of Draw the structure of the polymer produced...

Question 7

Ethylene oxide can be polymerized to form Carbowax. What conditions are best for the polymerization of ethylene oxide?

Accepted Answer

A)  anionic 
B)  cationic 
C)  free-radical 
D)  carbene 
E)  none of the above

Question 8

Which of the following is the best initiator for a free-radical polymerization?

Accepted Answer