Question

i) Which of the following is not true about step-growth polymers?

Formation of step-growth polymers usually results in the loss of a small molecule.

Step-growth polymers are formed by the reaction of bifunctional molecules.

Step-growth polymers can be formed by a free radical mechanism.

Step-growth polymers are also known as condensation polymers.

Step-growth polymers do not reach high molecular weight until the reaction has gone nearly to completion.

ii) Which of the following are not termination methods in radical polymerization?

reaction with the monomer

disproportionation

chain combination

reaction with an impurity

iii) Which of the following is the repeating unit in polystyrene?

-CH2CH(Ph)-

-para-C6H4CH2CH2-

-ortho-C6H4CH2CH2-

-CHC(Ph)-

iv) Which of the following can be used as an initiator for anionic polymerization?

a: -NH2

b: NH3

c: CH3CH2CH2CH2-

all of the above

a and c

v) What monomer(s) is (are) used to make nylon 6,6?

adipic acid

adipic acid and hexamethylenediamine

6-aminohexanoic acid

ε-caprolactam

dimethyl terephthalate and ethylene glycol