Why do you need two functional groups in condensation polymerisation? (1 Viewer)

[ragingcurry]

Why do you need two functional groups in condensation polymerisation?

The jacaranda textbook mentions this but I don't understand why you need two functional groups

 

[someth1ng]

Because it makes two functional groups to react.

In the case of condensation polymerisation, water is usually form from two OH groups.