But I know its a diblock copolymer!\" your technician exclaimed. \"PolyA is a li

Question

But I know its a diblock copolymer!" your technician exclaimed. "PolyA is a living polymer, which adds polyB at its end!" You are not so sure. The synthesis might have taken another route, ending in a blend of the two polymers. The starting molecular weight of polyA is known to be 100,000 g/mol, and polyB is estimated to be around 15,000 g/mol. Devise a GPC experiment for your technician, which will distinguish the 100% block copolymer from (b) a 50% block and 50% blend, from (c) a simple blend. Illustrate the probable resulting GPC chromatograms.

Explanation / Answer

a) at the 100% block copolymer from

Single Peak : M=115,000

b) 1 50% block Blend, from

Three Peaks : M1=115000, M2= 1000,000 , M3= 15000

c) A simple blend

Two Peaks : M1= 100,000 ; M2 = 15000.

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