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Gross melt fracture of polyethylene. II: Effects of molecular structure
Author(s) -
Kim Seungoh,
Dealy John M.
Publication year - 2002
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.10966
Subject(s) - materials science , dispersity , branching (polymer chemistry) , ultimate tensile strength , metallocene , composite material , fracture (geology) , polyethylene , polymer chemistry , polymerization , polymer
The effect of molecular structure (MW, MWD and LCB) on the critical tensile stress (σ c ) for the onset of gross melt fracture (OGMF), proposed in Part I (1) as a material‐dependent criterion for fracture, was determined for a group of polyethylenes varying in structure. These included linear low and high‐density polyethylenes and several materials produced using metallocene and constrained geometry catalysts. It was found that the critical stress is independent of M W , for constant polydispersity but increases with increasing long chain branching and polydispersity. The addition of boron nitride particles had no effect on the σ c up to a level of 0.5% by weight.