Formation
An addition polymer is formed by the reaction termed as polyaddition or addition polymerization. This occur in different ways which may be through free radical polymerization, cationic polymerization, anionic polymerization and coordination polymerization.
Most of the common addition polymers are formed from unsaturated monomers (usually having a double bond). This includes polythenes, polypropylene, PVC, Teflon, Buna rubbers, polyacrylates, polystyrene, PCTFE etc. Addition polymers are also formed from monomers having closed ring. Through coordination polymerization, even saturated monomers can form addition polymers.
When two or more types of monomers undergo addition polymerization, the polymer formed is known as an addition copolymer. Saran wrap, formed from polymerization of vinyl chloride and vinylidene chloride, is an addition copolymer.
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