通过改变助挤剂种类和含量,采用机械拉伸的方法制备了聚四氟乙烯(PTFE)拉伸膜,研究了助挤剂黏度、表面张力以及含量对挤出压力稳定性、拉伸膜的微观结构以及性能的影响。结果表明:助挤剂的黏度和表面张力越大,挤出压力越大、原纤化越多、拉伸膜的强度越高;助挤剂含量越高,挤出压力越小、原纤化越少、拉伸膜的强度越低,适当调整助挤剂的种类和含量,可以得到具有不同微观结构和性能的PTFE拉伸膜。
PTFE stretched membrane was prepared using mechanical stretching method by changing the type and content of the extrusion agent.The influence of viscosity,surface tension and content of the extrusion agent on the stability of extrusion pressure,microstructure and properties of the stretched membrane was studied.The results showed that the higher the viscosity and surface tension of the extrusion agent,the greater the extrusion pressure,the more the fibrillation,and the higher the strength of the membrane.The higher the content of the extrusion agent,the lower the extrusion pressure,the less the fibrillation,and the lower the strength of the membrane.By appropriately adjusting the type and content of extrusion agent,the PTFE stretched membrane with different microstructures and properties could be obtained.
[1] Puts G J,Crouse P,Ameduri B M.Polytetrafluoroethylene:synthesis and characterization of the original extreme polymer[J].Chemical Reviews,2019,119(3):1763-1805.
[2] Ochoa I,Hatzikiriakos S G,Mitsoulis E.Paste extrusion of polytetrafluoroethylene:temperature,blending and processing aid effects[J].International Polymer Processing,2022,21(5):497-503.
[3] Guo Q,Huang Y,Xu M,et al.PTFE porous membrane technology:a comprehensive review[J].Journal of Membrane Science,2022,664:121115.
[4] Henri V,Dantras E,Lacabanne C,et al.Thermal ageing of PTFE in the melted state:influence of interdiffusion on the physicochemical structure[J].Polymer Degradation and Stability,2020,171:109053.
[5] Li Z C,Li T Y,Deng Y R,et al.3D porous PTFE membrane filled with PEO-based electrolyte for all solid-state lithium-sulfur batteries[J].Rare Metals,2022,41(8):2834-2843.
[6] Ranjbarzadeh-Dibazar A,Barzin J,Shokrollahi P.Microstructure crystalline domains disorder critically controls formation of nano-porous/long fibrillar morphology of ePTFE membranes[J].Polymer,2017,121:75-87.
[7] Shi Y,Hu Y,Shen J,et al.Optimized microporous structure of ePTFE membranes by controlling the particle size of PTFE fine powders for achieving high oil-water separation perfor-mances[J].Journal of Membrane Science,2021,629:119294.
[8] Heo K J,Oh H J,Eom H,et al.High-performance bag filter with a super-hydrophobic microporous polytetrafluoroethy-lene layer fabricated by air-assisted electrospraying[J].Science of the Total Environment,2021,783:147043.
[9] Ebnesajjad S,Khaladkar P R.Fluoropolymer applications in the chemical processing industries:the definitive user's guide and handbook[M].New York:William Andrew Publishing,2005.
[10] Wang R,Xu G,He Y.Structure and properties of polytetrafluoroethylene (PTFE) fibers[J].e-Polymers,2017,17(3):215-220.
[11] Ochoa I,Hatzikiriakos S G,Mitsoulis E.Paste extrusion of polytetrafluoroethylene:temperature,blending and processing aid effects[J].International Polymer Processing,2022,21(5):497-503.
[12] Prorokova N P,Vavilova S Y,Buznik V M.Mechanical cha-racteristics of a polypropylene yarn with a polytetrafluoroethylene-based coating obtained through a new technology[J].Theoretical Foundations of Chemical Engineering,2021,55:1034-1040.
[13] Dhanumalayan E,Joshi G M.Performance properties and applications of polytetrafluoroethylene (PTFE)—a review[J].Advanced Composites and Hybrid Materials,2018,1:247-268.
[14] Vavlekas D,Melo L,Ansari M,et al.Role of PTFE paste fibrillation on Poisson's ratio[J].Polymer Testing,2017,61:65-73.
[15] Yi G,Tang X,Du L,et al.Hollow fiber polytetrafluoroethy-lene membrane heat exchanger with anti-corrosion properties[J].Journal of Membrane Science,2023,678:121664.
[16] Jia J,Zhou M,Liu D,et al.Study on two-stage stretching strategy for microstructure improvement of polytetrafluoroethylene hollow fiber membrane[J].Journal of Applied Polymer Science,2022,139(21):52216.
[17] Huang Y,Guo Q,Zhang Y,et al.Design and construction of PTFE porous membranes with high modulus and structural stability via in-situ interlocking and anchoring strategy[J].Composites Communications,2023,40:101632.
[18] Yu S,Qin Y,Zhao Q,et al.Nafion-PTFE hollow fiber composite membranes for ammonia removal and recovery using an aqueous-organic membrane contactor[J].Separation and Purification Technology,2021,271:118856.
[19] Wang A,Li X,Hou T,et al.A tree-grapes-like PTFE fibrous membrane with super-hydrophobic and durable performance for oil/water separation[J].Separation and Purification Technology,2021,275:119165.
[20] Vavlekas D,Ansari M,Hao H,et al.Zero poisson's ratio PTFE in uniaxial extension[J].Polymer Testing,2016,55:143-151.
[21] Ochoa I.Paste extrusion of polytetrafluoroethylene (PTFE) fine powder resin:the effects of processing aid physical pro-perties[D].New York:University of British Columbia,2006.
[22] Ranjbarzadeh-Dibazar A,Shokrollahi P,Barzin J,et al.Lubricant facilitated thermo-mechanical stretching of PTFE and morphology of the resulting membranes[J].Journal of Membrane Science,2014,470:458-469.
PDF
