Tacticity (stereochemistry) can change the properties of the polymer.
Number average (Mn) and weight average (Mw).
Glass transition (Tg) and melting temperature (Tm)
- Tm: crystalline regions, first order transition
- Tg: amorphous regions, second order transition
- hydrogen bonding increases Tg
- longer side chains lowers Tg
- at or below Tg, the ratio of free volume to total volume of polymer is constant