Take a look at a simple addition polymerisation reaction:
http://dragonslair.europe.webmatrixhosting.net/Science/Chemistry/Hydrocarbons/polymer.htm
Its from my website itself. See the formula that can be used to show the polymers in a row.
Now, I have two questions about this:
a) Bonds are formed during polymerisation, so, is the reaction exothermic?
b)What about the atoms that lie at the end of the chain? What about their side bonds that is supposed to link to other atoms? What happens to them? I don't want an answer like "There are millions, so these are ignored", however, I want to know the facts!