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Whats's the name of repeating monomeric units of Dacron and Neoprene?
Ethylene terephthalate and chloroprene, respectively.
Dacron is DuPont's trade name for PET (poly ethylene terephthalate), and neoprene is a familiar name for polychloroprene (poly-2-chlorobuta-1,3-diene).