Melt miscibility and solid-state properties of metallocene LLDPE blends with HDPE: Influence of MM of LLDPE
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The influence of relative molecular mass (MM) of LLDPE on the rheological, thermal and mechanical properties of two sets of m-LLDPE/HDPE blends of low and high branch content (BC) was studied. Blends of m-LLDPE with linear HDPE reveal no influence of MM (60–100 kg/mol) on melt miscibility at low BC (about 20 branches/1 000 C). However, at high BC levels (about 40 branches/1 000 C), MM affects the melt miscibility of m-LLDPE/HDPE blends. The DSC results suggest that compatibility in the solid state is independent of MM and BC. For all blends studied, the HDPE-rich blends are found to contain single crystal populations, suggesting high degree of cocrystallization, whereas, m-LLDPE rich phase shows separate crystallization. Mechanical properties of these blends are found to be a strong function of blend compatibility and the specific properties of the blend components. In general, the high BC pairs show poor mechanical properties.
Key wordsmolecular mass metallocene LLDPE miscibility rheological property
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- UTRACKI L A. Polymer Alloys and Blends; Thermodynamics and Rheology[M]. New York: Hanser, 1989.Google Scholar
- HUSSEIN I A. Proceedings of the 20th Meeting of the Polymer Processing Society, Akron, OH, June 20–24, 2004.Google Scholar
- BINGHAM E C. Fluidity and Elasticity[M]. New York: McGraw-Hill, 1922: 86.Google Scholar
- BOUSMINA M, PALIERNE J F, UTRACKI L A. Polym Eng Sci, 19.Google Scholar