Question

In general, condensation polymers have higher monomer feedstock costs but lower capital costs to synthesis.   False or True.

Above the critical degree of polymerization, molecular weight largely governs the mechanical properties of the polymer. True or False.

A and B are monomers polymerized to form the following copolymer:

A-A-B-A-B-B-A-A-A-B-A-B-A-A-B-B-B-B. This is an example of a block copolymer.   True or False

Engineering Thermoplastics are a class of polymers which are generally more expensive than commodity polymers.     True or False.

The processes of crystallization occurs at temperatures below the Tg (glass transition)   True or False.

Answer 1

1) True. The cost of the feedstock is greater than the capital cost since the process is a chemical reaction of condensation which usually gives water as byproduct which can be easily separated

2) True. Beyond the critical degree of polymerisation, the molecular weight of polymer increases and this increases the mechanical properties and majorly affects it. Refer figure

3) False: It is not a block copolymer

--> This is only an block polymer where there are blocks of monomer

The polymer given in question is periodic copolymer

4) True: Engineering thermoplastics are more expensive than commodity polymers. This is because they are developed for special applications and improved properties and requires higher cost of production than commodity polymers which tend to be cheaper

5) Yes: When the polymer is cooled below the glass transition temperature, it becomes rigid and forms a solid which is crystalline in nature. The reverse happens and polymer flows as a rubbery liquid at temperatures higher than Tg