聚醚砜/纤维素晶体共混膜材料及其超滤性能  

POLYETHERSULFONE/CELLULOSE CRYSTAL BLEND MEMBRANES AND THEIR ULTRAFILTRATION PERFORMANCE

作　　者：唐焕威[1] 张力平[1] 刘江[1] 赵广杰[1] 秦竹[2] 孙素琴[2] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083 [2]清华大学化学系,北京100084

出　　处：《高分子学报》2010年第4期429-434,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金项目(基金号30871967);国家林业局"948"引进项目(基金号2008-4-075);教育部"高等教育学科创新引智计划"(项目号B08005)资助

摘　　要：聚醚砜与纤维素晶体等共混成铸膜液,采用浸没沉淀相转化法制备聚醚砜/纤维素晶体共混膜材料.通过超滤装置检测复合膜的水通量、截留率、平均孔径、孔隙率、抗污染性等超滤性能,从而讨论了纤维素晶体含量对共混膜超滤性能的影响.采用抗张测试机、热重分析仪(TGA)、原子力显微镜(AFM)对共混膜的力学性能、热稳定性能、形貌结构进行表征.结果表明,随着纤维素晶体的含量的增加,共混膜的纯水通量先升高后有所降低,截留率均保持在91%～95%,抗张强度、断裂伸长率先增大后有所下降,抗污染性较纯聚醚砜膜显著提高.当纤维素晶体质量分数为1%时,纯水通量达到最大为813.3L·m-2·h-1,孔隙率为88.8%,平均孔径达为70.9nm,抗张强度为7.25MPa,断裂伸长率为11.6%,平均污染度FR值为22.0%,衰减系数m值为35.8%.共混膜具有由纤维素晶体、聚醚砜热降解分别引起的两个失重阶段.共混膜为典型非对称膜结构,表皮层较为致密,多孔支撑层孔径较大.The casting solution was obtained by blending polyethersulfone （ PES） and cellulose crystal in dimethylacetamide （ DMAC ）. PES /cellulose crystal blend membranes were prepared by the immersion precipitation phase inversion process. The effects of cellulose crystal content on the properties of blend membranes were discussed. The pure water flux,rejection ratio,porosity,mean pore size and anti-fouling property were tested in the ultrafiltration equipments. Also,the mechanical properties,thermal stability and morphology were characterized by tensile testing,thermogravimetric analysis （ TGA ） and atomic force microscopy （ AFM）. The results showed that at first,the pure water flux of blend membranes was greatly improved with the increasing of cellulose crystal content,but then it decreased to some extent. All the rejection ratios remained at 91% ～ 95% . The tendencies of tensile strength and elongation curses were the same as the one of pure water flux curve. The anti-fouling property of blend membrane had been improved. When the mass fraction of cellulose crystal was 1% ,the pure water flux got to a maximum,813. 3 L·m -2·h -1; porosity was 88. 8% and mean pore size was 70. 9 nm. At the same condition,tensile strength was 7. 25 MPa and elongation was 11. 6% . In addition,fouling degree （FR value） and attenuation coefficient of fouling （m value） were 22. 0% and 35. 8% ,respectively. There were two weight loss stages in the blend membrane,due to thermal degradation of PES and cellulose crystal,respectively. The typical asymmetric membrane structure was displayed in the blend membrane. The surface layer of the blend membrane was dense,and the support layer had larger size pores. Both of them composed the typical asymmetric membrane structure.

关 键 词：聚醚砜 纤维素晶体 共混膜 性能 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]