Question

write clearly, Please!

Briefly explain why it is critical that molecular weight be controlled? From practical point of view, what is the result if Mw is too low or too high? How can you control the Mw?

Answer 1

The question asked here is why it is critical to control the molecular weight

To control the molecular weight of a polymer is very important because the properties or most of the properties of polymer are depending on the molecular weight

In order to gain required properties of our polymer we can either increase or decrease the molecular weight

In general with increase in molecular weight physical properties are also increased.

If the molecular weight is too high or too low it will not possess the required properties that a polymer should have

So it is necessary to obtain that sweet spot for molecular weight so that we can have our required set of properties.

By increasing the degree of polymerisation or by decreasing it or by varrying the concentration of monomer or the catalyst the molecular weight can be controlled.