Question: When a polymer melt is quenched from a temperature above the melting p

Question

Question: When a polymer melt is quenched from a temperature above the melting point, Tm to a temperature below Tm, but above the glass transition, Tg, crystallisation is not a spontaneous process. Only one of the statements below is true ) Crystallization can only proceed when a crystal nucleus, that is sufficiently b) Crystallization can only proceed when the mobility of the chains has c Crystallization can only proceed when a crystal nucleus, that is sufficiently d) Crystallization can only proceed when the increase of polymer mobility small to be stable, accidentally forms slowed down and formed the glassy state large to be stable, accidentally forms that is due to the decreased temperature, has occurred

Explanation / Answer

Crystallization can only proceed when a crystal nucleus, that is sufficiently large to be stable, accidentally forms. The equilibrium between saturated solution and crystals of atleast moderate size is solubility realtion. As the size of teh particle decreases the its solubility increases. The magnitude of the smallest nucleus that is just enough to exist in equilibrium with saturated solution in which it is born is called critical size nucleii. Smaller size than critical dissolves.

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