addition polymerization

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addition polymerization

[ə¦dish·ən pə‚lim·ə·rə′zā·shən]
(organic chemistry)
A reaction initiated by an anion, cation, or radical in which a large number of monomer units are added rapidly (a chain reaction) until terminated by some mechanism, forming a high-molecular-weight polymer in a very short time; an example is the free-radical polymerization of propylene to polypropylene.
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