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Thermal Behavior of Polyethylene Reactor Alloys Polymerized by Ziegler-Natta/Late Transition Metal Hybrid Catalyst.
- Source :
- Macromolecular Reaction Engineering; Feb2015, Vol. 9 Issue 1, p8-18, 11p
- Publication Year :
- 2015
-
Abstract
- Polyethylene reactor alloys are synthesized through heterogeneous ethylene polymerization with a new type of Ziegler-Natta (ZN)/late transition metal (LTM) hybrid catalyst. The effect of various parameters including catalyst composition (LTM/ZN = 0.01, 0.02, 0.04), polymerization temperature (TP = 30, 30-60, 60 °C) and loading temperature (TL = 30, 60 °C) on catalyst activity, chain's vinyl content, viscosity average molecular weight ( M<subscript>v</subscript>) and thermal properties are investigated. Two distinct melting peaks were observed in the ranges of 110-140 °C and 60-90 °C, indicating presence of two different lamellar structures. LTM/ZN ratio shifted melting peaks toward lower values. Rheological properties confirmed homogeneity of polymer blend's microstructure as they follow time temperature superposition. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1862832X
- Volume :
- 9
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Macromolecular Reaction Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 100952126
- Full Text :
- https://doi.org/10.1002/mren.201400024