- Conference date: 30–31 July 2013
- Location: Zlin, Czech Republic
The slip behavior of several high-density polyethylenes (HDPEs) is studied as a function of molecular weight (M w) and its distribution for moderate to broad molecular weight distribution resins. It is found that slip depends strongly on M w and its distribution. The slip velocity increases with decrease of molecular weight, which is expected to decay to zero as the M w approaches a value with characteristic molecular dimension similar to surface asperities. For HDPEs that exhibit stick-slip transition, the slip velocity (before the stick-slip) has been found to increase with increase of polydispersity. The strong slip observed above the stick-slip flow regime is found to be independent of the molecular weight characteristics. A criterion is also discussed as to the occurrence or not of the stick-slip transition which is found to depend strongly on M w and its distribution.
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