introduction to polymer 3

I have two basic questions belong to Introduction of polymer

I need someone who can answer them briefly ( short Answers)

1- How would the mechanical and physical properties of thermoplastics change with (a) chain length (degree of polymerization), (b) chain stiffness, (c) side group size, and (d) degree of crystallinity.

2-How would you prepare (a) a very high molecular weight PET and (b) a low molecular weight PET terminated with hydroxyl groups?

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