乙烯-四氟乙烯共聚纤维的性能

为实现乙烯-四氟乙烯(ETFE)共聚纤维工业规模开发,通过熔融纺丝法制备了ETFE共聚初生纤维,并将初生纤维在150℃条件下通过电子拉伸试验机进行定长拉伸,得到拉伸比为100%和200%的纤维。利用热重分析仪、差示扫描量热分析仪、X射线衍射仪、动态热机械分析仪和电子拉伸机等分别测试了纤维的热性能、结晶结构、力学性能。测试得出:ETFE共聚热分解温度约为477℃;不同拉伸倍率纤维的熔融温度均保持在259℃左右;拉伸200%纤维断裂强度约为160 MPa,是初生纤维的3倍。结果表明:随拉伸倍率的提高,ETFE共聚纤维玻璃化转变温度提高9℃,结晶度和晶区取向度分别提高了10.2%和5.5%;经浓硫酸、氢氧化钠溶液、丙酮和次氯酸钠试剂处理后各纤维断裂强度均无明显变化,表现出良好的耐化学试剂性能。

Properties of ethylene-tetrafluoroethylene copolymer fibers

In order to achieve the development of industrial scale of ethylene?tetrafluoroethylene ( ETFE) copolymer fibers, ETFE copolymer as?spun fibers were prepared by melt spinning, and were stretched by an electronic tensile testing machine at 150 ℃ to obtain fibers with the stretch ratio of 100% and 200%, respectively. Thermal properties, crystal structure and mechanical properties of fibers were researched by thermogravimetric analyzer ( TG ) , differential scanning calorimeter ( DSC ) , X?ray diffractometer ( XRD) , dynamic mechanical analyzer ( DMA) and electronic tensile testing machine, respectively. The results show that the thermal decomposition temperature of ETFE copolymer is about 477 ℃. The melting temperatures of fibers of different draw ratio are all about 259℃. The breaking strength of fibers stretched by 200% is 160 MPa, which is close to three times of as?spun fibers. The DMA and XRD results indicate that with the increasing of the stretch ratios, glass transition temperature of ETFE copolymer fibers is increased by 9 ℃. In the meantime, the crystallinity and orientation improved by 10?2% and 5?5%respectively. Besides, the breaking strength of all kinds of fibers has no obvious change after treating with H2 SO4 , NaOH, acetone and NaClO, which shows the excellent resistance to chemical reagents.