Module 3 :
Lecture 15 : Introduction to Polymeric Materials
 


Molecular Weight

The molecular weight distribution is important in the first and second configurations which are also referred as thermoplastics. In thermosets, a gelled network of essentially infinite molecular weight is formed, so the idea of a "molecular weight distribution" is absent for such polymers.

Definitions of average molecular weight:


Weight average MW:


Where. Mi is the mass of the ith polymer chain; Ni is the number of chains with that mass.