The influences of branch content on the miscibility of octene LLDPE made by metal‐locene catalyst (m‐LLDPE) and by Ziegler‐Natta LLDPE (ZN‐LLDPE) in LDPE were investigated with rheological 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 ηo, η′ 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. Polym. Eng. Sci. 44:660–672, 2004.
No takes yet. Share an insight, caveat, or question.
Hussein et al. (2004) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: