Flow instability for binary blends of linear polyethylene and long-chain branched polyethylene |
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| Authors: | Naoya Mieda Masayuki Yamaguchi |
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| Institution: | 1. Key Laboratory of Earthquake Forecasting, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;2. Department of Geophysics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan;3. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | The rheological properties and flow instability are studied for binary blends composed of a long-chain branched polyethylene and a linear polyethylene. It is found that the blends containing a linear-polyethylene with high shear viscosity exhibit higher oscillatory moduli, drawdown force, and strain-hardening behavior. The blends showing the anomalous rheological phenomena show sharkskin failure in low shear rate region as compared with a pure linear polyethylene. Moreover, the blends exhibit severe gross melt fracture at low output rate. Enhanced strain-hardening in elongational viscosity and large entrance angle at a die entry will be responsible for the severe gross melt fracture for the blends. |
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