后拉伸条件对羟基化聚丙烯中空纤维膜性能影响的研究

Effects of Post-Stretching Conditions on the Properties of Hydroxylated Polypropylene Hollow Fiber Membranes

合成研究了不同羟基插入率的羟基化聚丙烯(PPOH),使用熔融纺丝-拉伸法(MS-S)制备了PPOH中空纤维膜并探究了热拉伸温度、热拉伸比例对其孔径分布、孔隙率、水通量和力学性能的影响。相比聚丙烯(PP)中空纤维膜,相同条件下制备的PPOH中空纤维膜的水通量更高,孔径更大,拉伸强度和孔隙率则较低。当热拉伸温度为110℃、热拉伸比例为150%时,PPOH中空纤维膜的孔径为0.139μm,孔隙率为22.1%,水通量为1 822 L/(m2·h),拉伸强度为123 MPa。

Hydroxylated polypropylene(PPOH) with different hydroxyl insertion ratios was synthesized.The PPOH hollow fiber membranes were prepared by the melt spinning-stretching method(MS-S).The effects of heat stretching temperatures and heat stretching ratios on the pore size distribution,porosity,water flux and mechanical properties were investigated.Compared with polypropylene(PP) hollow fiber membranes,the prepared PPOH hollow fiber membranes under the same conditions had larger water flux and pore size,lower tensile strength and porosity.When the heat stretching temperature is 110 ℃ and the hot stretching ratio is 150%,the PPOH hollow fiber membrane has a pore size of 0.139 μm,a porosity of 22.1%,a water flux of 1 822 L/(m^(2)·h),and a tensile strength of 123 MPa.