Kinetic approach to radiation‐induced grafting in the polyethylene‐styrene system. IV. Comparison between high density polyethylene and low density polyethylene

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Abstract
The investigation method reported in earlier articles was applied to preirradiation methods of the reaction of low‐density polyethylene (LDPE) in liquid and vapor and compared with high‐density polyethylene (HDPE). Monomer concentrations during reactions and monomer feed rates were determined gravimetrically. Increasing patterns of the degree of grafting were obtained and compared. Monomer concentration during the reactions was lower in LDPE than HDPE and radical decay was more rapid in LDPE. A model calculation was applied to this experiment and a schematic explanation was attempted. The differences between the reaction mechanisms of HDPE and LDPE are explained.

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