One question per week: Basics of polymers – What are the similarities and differences between crystallization and amorphous behavior in polymers during cold drawing?
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As is well known, the processes of polymer yield and necking are collectively referred to as cold drawing. So, during the actual cold drawing process, how can it be determined whether a polymer is crystalline or amorphous based on that process? In other words, what are the similarities and differences between the cold drawing processes of crystalline and amorphous polymers?
It is difficult to determine whether it is a crystalline polymer or an amorphous polymer based on the cold drawing process.
In cold-drawn crystalline polymers, the tensile strength remains almost unchanged once yield strength is reached
Theoretically, cold drawing of amorphous polymers occurs at Tb~Tg, while that of crystalline polymers occurs at Tg~Tm
As mentioned above, what was discussed in Gao Wushang is exactly what was said earlier; I didn’t fully understand this phrase even back when I was in school. I hope the teacher can give some guidance.
But in reality, it seems there’s no difference