کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1313932 | 1499324 | 2015 | 6 صفحه PDF | دانلود رایگان |
• Melt fracture of ethylene–tetrafluoroethylene copolymer is revealed.
• Super-extrusion occurs, leading to high out-put rate extrusion.
• Critical stresses of shark-skin and slip-stick failures are found.
The capillary extrusion property of ethylene–tetrafluoroethylene copolymer (ETFE) is evaluated. It is found that ETFE shows several types of flow instabilities. The shark-skin failure is observed over the first critical shear stress 7.9 × 104 Pa. Then, the slip-stick instability is detected at 1.8 × 105 Pa, which corresponds to the critical stress of the slippage at the die wall, evaluated by the Mooney method. Moreover, gross wavy melt fracture appears at high out-put rate condition. It is interesting to note that quasi-stable flow region; so-called “super-extrusion”, is observed between slip-stick and wavy melt fracture regions. Because of the steady slippage, ETFE can be extruded at a high out-put rate condition without surface roughness and distortion of extrudates.
“Super-extrusion” is observed between slip-stick and wavy melt fracture regions, leading to a high out-put rate extrusion without surface roughness and distortion of extrudates.Figure optionsDownload as PowerPoint slide
Journal: Journal of Fluorine Chemistry - Volume 176, August 2015, Pages 20–25