Aliphatic polyolefins copolymers containing ethylene

The aliphatic aldehydes and ketones have a weak absorption with a maximum between 270 and 290 nm and a tail which spreads into the region beyond 300 nm. This absorption is attributed to a forbidden (nit ) transition, in which an electron in a nonbonding orbital localized on the oxygen atom is promoted to a delocalized antibonding it orbital distributed over all the carbonyl groups (13). Similar absorption was found for polyolefins containing carbonyl groups in their chain such as ethylene-carbon monoxide copolymer (1 % of CO) (14). 

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