利用无皂乳液聚合法合成双亲性聚丙烯酸(PAA)-g-聚甲基丙烯酸甲酯(PMMA)-g-硅烷偶联剂KH570-g-纳米TiO2复合体,通过调节亲水链中丙烯酸(AA)与甲基丙烯酸甲酯(MAA)单体的比例控制复合粒子的表面性能.利用红外光谱、接触角测定、扫描电镜(SEM)等表征技术研究不同表面性能的双亲性纳米TiO2复合粒子对聚偏氟乙烯(PVDF)超滤膜结构与性能的影响.研究表明,随着亲水链中AA单体含量增多,复合体亲水性增强,改性膜亲水效果越显著,膜通量越大,但易形成大孔,截留率低,且改性膜压密性欠佳.而复合体亲水链中MMA单体含量越多,膜亲水改性效果越差,膜通量低,但膜压密性能好.两种单体最佳比例应控制在40%-60%,此时改性PVDF复合超滤膜性能优异,膜通量、截留率分别达到80mL/cm2·h和80%以上.
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