Explain the paragraph: GAP $($glycidyl azide polymer$)$ has a low weight percentage of polymer bearing chain which results in an energetically binder favors system.

also, what is meant by polymers bearing chains.

And what is the reasons that make GAP polymers has a low weight percentage of polymer$-$bearing chain.

And show how at low temperature GAP is hard and brittle due to the existence of N$3$ group.

Discuss the glass transition temperature of GAP polymers. $($all effects$)$