Metallic organic compounds of iron, stannum and manganese were introduced into lowdensity polyethylene as catalysts of degradation at low temperatures. The mechanical properties, viscosity\|average molecular weight of...Metallic organic compounds of iron, stannum and manganese were introduced into lowdensity polyethylene as catalysts of degradation at low temperatures. The mechanical properties, viscosity\|average molecular weight of polyethylene and the hydroperoxide concentration in the matrix were measured. It was shown that at 70℃ the adopted additives can catalyze the degradation of polyethylene efficiently. After 60 day’s aging, most of the samples became very fragile, and their molecular weight decreased in large scales. The relationship between molecular weght and hydroperoxide concentration, as well as the mode of the degrading behavior of the prepared matrixes, was also discussed.展开更多
The catalytic effects of the organic compounds of iron,tin and manganese on the degradation of low density polyethylene (LDPE) at compost temperature are discussed.A series of samples were aged in a simulating compost...The catalytic effects of the organic compounds of iron,tin and manganese on the degradation of low density polyethylene (LDPE) at compost temperature are discussed.A series of samples were aged in a simulating compost environment.The mechanical properties,viscosity average molecular weight (M η) of PE and hydroperoxide (POOH) concentration in the samples were measured.FT IR and DSC were also applied to characterize some samples.It was shown that the above mentioned metallic organic compounds can catalyze the degradation of LDPE efficiently.After 2 months aging,all samples with catalysts became fragile and the M η of the material decreased dramatically.Furthermore,the concentration of carbonyl and the degree of crystallinity of the material increased with the aging time.展开更多
文摘Metallic organic compounds of iron, stannum and manganese were introduced into lowdensity polyethylene as catalysts of degradation at low temperatures. The mechanical properties, viscosity\|average molecular weight of polyethylene and the hydroperoxide concentration in the matrix were measured. It was shown that at 70℃ the adopted additives can catalyze the degradation of polyethylene efficiently. After 60 day’s aging, most of the samples became very fragile, and their molecular weight decreased in large scales. The relationship between molecular weght and hydroperoxide concentration, as well as the mode of the degrading behavior of the prepared matrixes, was also discussed.
文摘The catalytic effects of the organic compounds of iron,tin and manganese on the degradation of low density polyethylene (LDPE) at compost temperature are discussed.A series of samples were aged in a simulating compost environment.The mechanical properties,viscosity average molecular weight (M η) of PE and hydroperoxide (POOH) concentration in the samples were measured.FT IR and DSC were also applied to characterize some samples.It was shown that the above mentioned metallic organic compounds can catalyze the degradation of LDPE efficiently.After 2 months aging,all samples with catalysts became fragile and the M η of the material decreased dramatically.Furthermore,the concentration of carbonyl and the degree of crystallinity of the material increased with the aging time.
