Water-absorptivity and mechanical behaviors of PTFE/PA6 and PTFE/PA66 blends  

作　　者：赵荣国 罗文波 肖华明 吴国忠 

机构地区：[1]Institute of Fundamental Mechanics and Material Engineering Xiangtan University, Xiantan 411105, China [2]Key Laboratory for Advanced Materials and Rheological Properties of Ministry of Education, Xiangtan University,Xiangtan 411105, China [3]Key Laboratory for Advanced Materials and Rheological Properties of Ministry of Education,Xiangtan University,Xiangtan 411105,China [4]Shanghai Institute of Applied Physics, Chinese Academy of Sciences,Shanghai 201800,China [5]Shanghai Institute of Applied Physics Chinese Academy of Sciences,Shanghai 201800,China

出　　处：《中国有色金属学会会刊：英文版》2006年第B02期498-503,共6页Transactions of Nonferrous Metals Society of China

基　　金：Prqject(10572123) supported by the National Natural Science Foundation of China Project(05JJ30014) supported by the Natural Science Foundation of Hunan Province, China Project(05C100) supported by the Scientific Research Fund of Education Department of Hunan Province, China

摘　　要：The effects of polytetrafluoroethylene (PTFE) content on water-absorptivity, tensile strength, flexural strength, and notched impact strength of polytetrafluoroethylene/polyamide 6 (PTFE/PA6) and polytetrafluoroethylene/polyamide 66 (PTFE/PA66) blends were investigated by water immersion test, uniaxial tensile test, three-point test, and Charpy impact fracture test. The water-absorptivity in the blend decreases with increasing PTFE content, which indicates that the PTFE phase restrains the polyamide phase from water absorption. For water-free blends, the addition of PTFE causes a reduction in tensile strength, while for water-absorbed PTFE/PA6 blends, the tensile strength increases with increasing PTFE. Simultaneously, the absorbed water improves the elongation, but results in a notable reduction in flexural strength of the blends. Although the addition of PTFE causes a reduction in notched impact strength of the blends, as compared to pure polyamide, the absorbed water has little effects on the notched impact strength of the blends. Finally, the effects of temperature and loading frequency on complex viscosity parameters of PTFE/PA6 and PTFE/PA66 melts were tested. It is found that the complex viscosity of PTFE/PA6 melt is reversed with increasing temperature and shear velocity, but that of PTFE/PA66 melt increases approximately in exponential form with increasing temperature. To fill polyamide with suitable mass percentage of PTFE can effectively reduce the viscosity of blend, and as a result, the molding and processing properties are improved.The effects of polytetrafluoroethylene （PTFE） content on water-absorptivity, tensile strength, flexural strength, and notched impact strength of polytetrafluoroethylene/polyamide 6 （PTFE/PA6） and polytetrafluoroethylene/polyamide 66 （PTFE/PA66） blends were investigated by water immersion test, uniaxial tensile test, three-point test, and Charpy impact fracture test. The water-absorptivity in the blend decreases with increasing PTFE content, which indicates that the PTFE phase restrains the polyamide phase from water absorption. For water-free blends, the addition of PTFE causes a reduction in tensile strength, while for water-absorbed PTFE/PA6 blends, the tensile strength increases with increasing PTFE. Simultaneously, the absorbed water improves the elongation, but results in a notable reduction in flexural strength of the blends. Although the addition of PTFE causes a reduction in notched impact strength of the blends, as compared to pure polyamide, the absorbed water has little effects on the notched impact strength of the blends. Finally, the effects of temperature and loading frequency on complex viscosity parameters of PTFE/PA6 and PTFE/PA66 melts were tested. It is found that the complex viscosity of PTFE/PA6 melt is reversed with increasing temperature and shear velocity, but that of PTFE/PA66 melt increases approximately in exponential form with increasing temperature. To fill polyamide with suitable mass percentage of PTFE can effectively reduce the viscosity of blend, and as a result, the molding and processing properties are improved.

关 键 词：PTFE/PA66混合物 PTFE/PA6混合物 吸水性 粘性 聚四氟乙烯/聚酰胺混合物 力学性质 

分 类 号：TB332[一般工业技术—材料科学与工程]