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.
Read more about this topic: Addition Polymer
Famous quotes containing the word formation:
“It is because the body is a machine that education is possible. Education is the formation of habits, a superinducing of an artificial organisation upon the natural organisation of the body.”
—Thomas Henry Huxley (1825–1895)
“The formation of an oppositional world view is necessary for feminist struggle. This means that the world we have most intimately known, the world in which we feel “safe” ... must be radically changed. Perhaps it is the knowledge that everyone must change, not just those we label enemies or oppressors, that has so far served to check our revolutionary impulses.”
—Bell (c. 1955)
“Out of my discomforts, which were small enough, grew one thing for which I have all my life been grateful—the formation of fixed habits of work.”
—Elizabeth Stuart Phelps (1844–1911)