A polymer in which the repeating units are not all the same. Usually, but not always, copolymers are formed from two or more different starting materials. For example, chloroethene (vinyl chloride) and 1,1-dichloroethene (vinylidene chloride) form a copolymer that contains the repeating units: -CH2-CHCl- and -CH2-CCl2- . The different classes of copolymer include random copolymers, alternating copolymers, block copolymers, and graft copolymers
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