$1)$ Write down the monomer name and chemical formula of repeating unit of

following polymers. PE$,$ PP$,$ PVC$,$ PC$,$ Nylon$6,6,$ PET,PC$,$ PS$,$ PMMA,PU$,$

$2)$ An isotactic polymer crystallizes but not the atatic polymer$-$ Why?

$3)$ What is the difference between conformation and configuration? $4)$ Two polymer samples of same polymer differ by conformation are given to you. What

difference of properties in the polymer sample would you expect?

Explain following terms: thermosetting plastic, thermo plastic, interpenetrating

polymer networks $($IPN$),$ polymer melt, polymer blend, branched polymer,

amorphous polymer, crystalline polymer, glass transition temperature, melt flow

temperature, melting temperature.

What is the state of an amorphous polymer sample at temperature $($i$)$ below its

glass temperature, $($ii$)$ slightly above glass transition temperature and $($iii$)$ above

melt flow temperature?