HBPEHamster Buccal Pouch Epithelium
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Figure 6 shows the dependence of the ESCR of the HDPE/HBPE blends on the octene content in the HBPE (expressed as the weight fraction [w.
When a short-chain branched HDPE of a relatively low density with a good starting level of ESCR (HDPE 5) is used in systems with LLDPE or HBPE of low density, even a small increase of the tie-molecule density beyond 0.
13, the use of a short-chain branched HDPE with a relatively good ESCR (HDPE 5) in blends with HBPE with a low comonomer content and hence relatively high density (HBPE 1) may result in a decreasing tie-molecule density at an increasing HBPE content, which explains the decrease in failure times and hence in ESCR of the blend (Fig.
In addition, the portion of the long-chain branches in the HBPE must be taken into consideration for the HDPE/HBPE systems, which, when increased, will probably lead to an increase in the tie-molecule density and is attributable to the inclusion of longer polyolefin units with an end double bond resulting from transfer reactions in the specific catalyst system.