Polymers/Properties

Tacticity (stereochemistry) can change the properties of the polymer.


Isotactic	Syndiotactic	Atactic

Molecular mass

Number average (M_n) and weight average (M_w).

$M_{n} = \frac{\sum M_{i} N_{i}}{\sum N_{i}}, M_{w} = \frac{\sum M_{i}^{2} N_{i}}{\sum M_{i} N_{i}}, M . W . D . o r P D i = \frac{M_{w}}{M_{n}}$

Glass transition (T_g) and melting temperature (T_m)

hydrogen bonding increases T_g
longer side chains lowers T_g
at or below T_g, the ratio of free volume to total volume of polymer is constant

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