| 학회 |
한국고분자학회 |
| 학술대회 |
2008년 봄 (04/10 ~ 04/11, 컨벤션 뷰로(대전)) |
| 권호 |
33권 1호 |
| 발표분야 |
고분자 구조 및 물성 |
| 제목 |
ABNORMAL RHEOLOGICAL BEHAVIOR OF LINEAR LOW DENSITY POLYETHYLENE MELTS AT HIGH SHEAR RATE |
| 초록 |
During capillary extrusion with a linear low density polyethylene (LLDPE), we observe abnormal rheological behavior. The nominal viscosity in the stick-slip flow regime and the gross melt fracture regime increases with a temperature. This is attributed to the slippage of polymer melts. It is known that occurrence of the slippage can be detected by the Mooney analysis. However, it is found that the Mooney analysis is not applicable to detect the occurrence of the slippage in the gross melt fracture regime. This is attributed to the fact that main assumptions in the Mooney analysis are not valid in the gross melt fracture regime, mainly due to the turbulent-like flow pattern. We suggest that failure of time-temperature superposition principle can be used for indication of the slippage for polymer melts. |
| 저자 |
김재환, 손영곤
|
| 소속 |
공주대 |
| 키워드 |
LLDPE; melt fracture; stick-slip
|
| E-Mail |
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