The effects of fibrillation factors for polytetrafluoroethylene through paste extrusion
The unique fibrillation behavior of polytetrafluoroethylene (PTFE) pastes in the extrusion process was studied. As the tensile strength and post processing ability of the nascent extrudate relate closely with fibrillation, it is necessary to study the fibrillation factors systematically. The effects of the additives and their contents on the forming of the nascent extrudate were studied. It is found that the low-molecular-weight alkane is more suitable for the paste extrusion than the ethanol. And the content of additives plays an important role in the process because the additives work as a binder and are responsible for the final strength of the extrudate. The processing temperature and speed influence the final strength of the extrudate by affecting the fibrillation capacity and kinetic of the particles during the extrusion. Temperature lower than the second transition point is helpful for a smooth surface; and moderate speed is more conducive to the formation of fibril.
LI Min WANG Chaosheng LI Xiaolin WANG Huaping
College of Material Science and Engineering, Donghua University, Shanghai 201620, P.R.China
国际会议
2009 International Conference on Advanced Fibers and Polymer Materials(2009年先进纤维与聚合物材料国际学术会议)
上海
英文
127-129
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）