Editing Addition polymer (section)

{{Short description|Polymer formed from a chemical reaction with no by-products}}

In [[polymer chemistry]], an '''addition polymer''' is a [[polymer]] that forms by simple linking of [[monomer]]s ''without'' the co-generation of other products. Addition [[polymerization]] differs from [[condensation polymer|condensation polymerization]], which ''does'' co-generate a product, usually water.<ref>''Introduction to Polymers'' 1987 R.J. Young Chapman & Hall {{ISBN|0-412-22170-5}}</ref><ref>{{cite book|title=An Introduction to Polymer Chemistry|publisher=Pergamon Press|year= 1967 |author1=D. Margerison |author2=G. C. East |author3=J. E. Spice|isbn=978-0-08-011891-8}}</ref>  Addition polymers can be formed by [[Chain-growth polymerization|chain polymerization]], when the polymer is formed by the sequential addition of monomer units to an active site in a [[chain reaction]], or by [[polyaddition]], when the polymer is formed by [[addition reaction]]s between species of all [[degree of polymerization|degrees of polymerization]]. Addition polymers are formed by the addition of some simple monomer units repeatedly. Generally polymers are unsaturated compounds like alkenes, alkalines etc. The addition polymerization mainly takes place in free radical mechanism. The free radical mechanism of addition polymerization completed by three steps i.e. Initiation of free radical, Chain propagation, Termination of chain.