Abstract: Nano-Al₂O₃ was surface-modified by silane coupling agent (2-cyanogen ethyl) triethoxysilane,with which the modified Al₂O₃/PVDF organic-inorganic hybrid membrane was prepared by thermally induced phase transition. Effect of the dosage of the modified Al₂O₃ on the performance of the hybrid membrane was examined. After modified by (2-cyanogen ethyl) triethoxysilane,the number of nano-Al₂O₃ particle clusters was reduced,and the averaged minimum size of nano-Al₂O₃ particles decreased to 52.23nm.The addition of modified nano-Al₂O₃ improved the morphology of hybrid membrane,compared with the pure PVDF membrane,the spherulite density increased and the spherulite size of hybrid membrane became smaller,and a lot of holes through the interface were formed,resulting in the increased membrane porosity. The hydrophilicity,mechanical properties and rejection of PVDF membrane were improved greatly with the addition of modified Al₂O₃. When the amount of Al₂O₃ was more than 5%,the rejection of the film increased by 7.2%,and the pure water flux of the modified Al₂O₃/PVDF membrane was 593.95L/(m²·h),and mechanical strength of hybrid membrane reached 5.0MPa.

Key words: silane coupling agent, surface modification, polyvinylidene fluoride(PVDF), ultrafiltration membrane

摘要： 采用硅烷偶联剂（2-氰乙基）三乙氧基硅烷对纳米Al₂O₃粒子进行表面改性，利用热致相变法制备了改性Al₂O₃/PVDF有机无机杂化膜，研究了改性Al₂O₃的添加量对杂化膜性能的影响。经（2-氰乙基）三乙氧基硅烷改性后，纳米Al₂O₃粒子的团聚减少，改性后纳米Al₂O₃的平均最小粒径为52.23nm。与纯PVDF膜比较，改性纳米Al₂O₃的添加改善了PVDF膜的形貌结构，改性Al₂O₃/PVDF杂化膜形成的球晶明显增加，球晶的密度尺寸缩小，杂化膜中形成了大量连通的界面孔，膜的孔隙率升高，改善了PVDF膜的力学性能和亲水性，提高了截留率。当纳米粒子添加量达到5%时，膜的截留率提高了7.2%，膜的纯水通量达到了593.95L/（m²·h），膜强度达到5.0MPa。

关键词: 硅烷偶联剂, 表面改性, 聚偏氟乙烯, 超滤膜