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Mechanical properties of crosslinked polyolefin‐based materials
Author(s) -
Chodák Ivan,
Nógellová Zuzana,
Kokta Bohuslav V.
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991470109
Subject(s) - low density polyethylene , materials science , ultimate tensile strength , composite material , toughness , polyethylene , polyolefin , modulus , elongation , adhesion , young's modulus , izod impact strength test , polymer , layer (electronics)
The effect of crosslinking on mechanical properties of various polyethylene‐based materials is compared. In virgin polyethylene, higher strength results from formation of spatial network, especially at increased temperatures. On the other hand, decreased crystalline portion leads to lower Young's modulus values compared with the uncrosslinked polymer. Crosslinking of LDPE/PP blends leads to a dramatic increase in elongation at break and impact resistance. The reason is seen in an in situ formation of very efficient compatibilizers via co‐crosslinking on the phase boundary. In LDPE filled with silica, the main effect consists in higher elongation at break and increased toughness, although the effect is lower than that in LDPE/PP blends. Increased resistance to the crack growth rate was demonstrated to be a reason for the observed behaviour. In LDPE filled with organic fillers, formation of direct covalent bonds on the interface and a significant increase in adhesion is suggested to be the reason for the enormous increase in Young's modulus and tensile strength observed.