Abstract
The influences of branch content on the miscibility of octene LLDPE made by metallocene catalyst (m-LLDPE) and by Ziegler-Natta LLDPE (ZN-LLDPE) in LDPE were Investigated with Theological methods. Dynamic and steady shear measurements were carried out in a Rheometrics Mechanical Spectrometer 800. Here, m-LLDPEs were used to isolate Interaction of molecular parameters. Blends of octene m-LLDPE and ZN-LLDPE with LDPE were mixed at 190°C in the presence of an adequate amount of antioxidant. The miscibilities of blends were revealed by the dependence of their measured η0, ′ and G′ on blend composition as well as on agreement with predictions of different emulsion models. Blends of m-LLDPE with LDPE were found to be almost miscible in the LLDPE branching range 10-30 branches/1000 C. However, immiscibility was found to develop at lower LLDPE branch contents. For ZN-LLDPE/LDPE systems, branch content plays a significant role especially at low branch contents. The comparison of m-LLDPE and ZN-LLDPE systems suggest the strong Influence of branch distribution (uniform and random, respectively). Palierne, Bousmina, and Scholz models fitted the loss and storage moduli data well with a value of α/R in the range 103-104 N/m2.
| Original language | English |
|---|---|
| Pages (from-to) | 660-672 |
| Number of pages | 13 |
| Journal | Polymer Engineering and Science |
| Volume | 44 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 2004 |
ASJC Scopus subject areas
- General Chemistry
- Polymers and Plastics
- Materials Chemistry