condensation polymer is stronger
Condensation polymers loose watermolecules during polymerisation, whereas Addition Polymers do not.
A polymer formed by the chain addition of unsaturated monomer molecules, such as olefins, with one another without the formation of a by-product as water or without the loss of any atom or molecule...
balls!
The big six polymers are classified as thermoplastics. This means that they can be melted and shaped.