Synthesis and photodegradation behavior of polyethylene containing side‐chain keto ether groups

摘要

AbstractThe synthesis and photochemical behavior of the polymers obtained by grafting diazoacetophenones andp‐substituted diazoacetophenones onto an ethylene–vinyl alcohol copolymer were studied. Photodegradation proceeds through a primary process with generation of acetophenone (or thep‐substituted acetophenone) and “in chain” keto groups. A secondary photochemical process sensitized by these two units leads to oxidative photodegradation. The degradation leads to lowering of the molecular weight in prevalence to crosslinking. The effect of thep‐substitution on the acetophenone with electron‐withdrawing substituent has little effect on the deg