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Photoinitiated crosslinking of low density polyethylene: II. Morphology and properties
Author(s) -
Qing Yan,
Wenying Xu,
Rånby Bengt
Publication year - 1991
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.760312203
Subject(s) - crystallinity , materials science , polyethylene , low density polyethylene , melting point , composite material , crystal (programming language) , morphology (biology) , benzophenone , melting temperature , heat deflection temperature , modulus , yield (engineering) , polymer chemistry , chemical engineering , izod impact strength test , biology , ultimate tensile strength , computer science , engineering , genetics , programming language
The crystalline morphology and physical properties of photocrosslinked polyethylene in a low density polyethylene (LDPE)‐benzophenone (BP)‐triallyl isocyanurate (TAIC) system have been studied. The results of X‐ray diffraction and DSC thermal analysis indicate that the effect of crosslinking on the degree of crystallinity of the material is quite limited, but the presence of crosslinks can affect the regularity of the crystal regions. This is proposed to be responsible for the slight variation in properties of the crosslinked material at room temperature, such as the decrease of modulus and the changes of yield behavior. The main improvements in properties of the photocrosslinked polyethylene are found at high temperatures, especially above the melting point. The strength is increased, and the heat distortion temperature is enhanced significantly, as previously reported in the literature.