The number average molecular weight of polystyrene ( see formula above) is 250,0

Question

The number average molecular weight of polystyrene ( see formula above) is 250,000 g/mol. Compute the number average degree of polymerization (atomic weight of C= 12, H=1)

Determine the ratio of butadiene to syrene mers in a copolymer having a weight average molecular weight of 350,000 g/mol and weight average degree of polymerization of 44251 The number average molecular weight of polystyrene ( see formula above) is 250,000 g/mol. Compute the number average degree of polymerization (atomic weight of C= 12, H=1)

Explanation / Answer

explanation for above answer:

From the ratio of butadiene to styrene repeat units = Fb/Fs = 1 (1:1)

The ratio of the the two units in the co-polymer is 1:1 in case of alternating co-polymers There is no fixed ratio prescribed for random, graft and block co-polymers (1:1 could be a

possible ratio for each of these types!)

Therefore, with the ratio of butadiene to styrene repeat units obtained in part copolymer be of alternating, random, graft and block types.

So option will be C) 50% butadiene- 50% styrene

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