[cadet04]

hey guys,
i have a few questions understanding what is happening in this diagram
1. is this addition polymerisation?
2. what causes the nitrogen-carbon double bond in ldi to break? is it the oxygen in glycerol?? would another radical need to be implemented to break the double bond?
3. does the oxygen prefer to be bonded to carbon or something? why does it ditch the hydrogen and then the hydrogen bond to nitrogen?
4. is there a name when three branches are created off glycerol instead of the regular 2?
5. also any properties you would expect this polymer to have

basically if someone could explain this in detail, it would be very much appreciated.
thanks 

[OrgXemProf]

Consider isocyanate to be an "acyl derivative" and that glycerol can function as a nucleophile. Then, the mechanism by which esters are formed via reaction of an acyl derivative with an alcohol provides a useful model to help you understand "what causes the nitrogen-carbon double bond in LDI to break". Hope this helps.