<P> An addition polymer is a polymer that forms by simple linking of monomers without the co-generation of other products . Addition polymerization differs from condensation polymerization, which does cogenerate a product, usually water . Addition polymers can be formed by 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 reactions between species of all 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 . </P> <P> Many common addition polymers are formed from unsaturated monomers (usually having a C = C double bond). The most prevalent addition polymers are polyolefins, i.e. polymers derived by the conversion of olefins (alkenes) to long - chain alkanes . The stoichiometry is simple: </P> <Dl> <Dd> n RCH = CH → (RCH - CH) </Dd> </Dl>

What kind of polymers are prepared by addition reactions of alkenes