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Photoinitiated crosslinking of low density polyethylene. III: Degradation and stabilization of photocrosslinked polyethylene
Author(s) -
Qing Yan,
Wenying Xu,
Rånby Bengt
Publication year - 1994
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760340511
Subject(s) - materials science , polyethylene , stabilizer (aeronautics) , degradation (telecommunications) , amine gas treating , chemical engineering , irradiation , infrared spectroscopy , absorption (acoustics) , radical , low density polyethylene , polymer chemistry , nuclear chemistry , composite material , organic chemistry , chemistry , telecommunications , computer science , engineering , mechanical engineering , physics , nuclear physics
Electron spectroscopy (ESCA) and reflectance infrared spectroscopy (ATR) were used to measure surface oxidation of photocrosslinked polyethylene. The deterioration of bulk properties during an artificial weathering test was also measured. It was found that the UV‐irradiation during crosslinking process decreases the stability of the material considerably. Three kinds of antioxidants and photostabilizers (hindered phenols, hindered amines, and organic sulfides) which have no absorption in the UV region of 300 to 400 nm were added before crosslinking to improve the stability of the crosslinked material. Neither the rate nor the degree of photocrosslinking at different depths of the sample were affected significantly by these additives. It was found possible to prevent the decrease in stability due to the photocrosslinking by using small amounts of a stabilizer, e.g. 0.05% Tinuvin 770 (hindered amine).