新型纳米纤维素聚砜复合膜的制备及表征

Preparation and Characterization of New Nano-cellulose Polysulfone Composite Membrane

采用L-S浸没沉淀相转化法制备纳米纤维素(NCC)/聚砜(PSF)复合膜材料。考察了NCC添加量及异丙醇凝胶浴浓度(10%、30%、50%,体积分数,下同)对膜结构和性能的影响。通过扫描电子显微镜(SEM)观察了复合膜材料断面和皮层的孔结构,发现随着异丙醇浓度的增加,复合膜中的指状孔由细长贯通、连接紧密逐渐变得短粗、疏松。同时,NCC添加量和异丙醇凝胶浴浓度对复合膜的力学性能、渗透性能、膜孔结构有很大的调控作用。

L-S immersion precipitation phase inversion method was used to prepare nanocellulose （NCC）/poly- sulfone （PSF） composite membrane materials. The influence of NCC contents and concentrations （10 ~/0, 30 ~, 50 ~） of isopropanol coagulation bath on the membrane structure was characterized. The pore structure of the composite membrane was observed by scanning electron microscope （SEM）. With the isopropanol concentration increased, the finger pores in the composite membrane gradually develop from elongated into stubby and loose. At the same time, it can be found that the concentrations of NCC and isopropanol coagulation bath play a significant role on the mechanical properties, pure water flux, porosity and rejection rate of the composite membrane.