The effect of sulfonated polysulfone on the compatibility and structure of polyethersulfone-based blend membranes

聚砜 化学工程 材料科学 差示扫描量热法 膜结构 相位反转 聚合物 生物污染 聚合物混合物 高分子化学 化学 复合材料 共聚物 热力学 工程类 生物化学 物理
作者
Shiwen Li,Zhenyu Cui,Lei Zhang,Benqiao He,Jianxin Li
出处
期刊:Journal of Membrane Science [Elsevier BV]
卷期号:513: 1-11 被引量:154
标识
DOI:10.1016/j.memsci.2016.04.035
摘要

Polymer blend is the most common method to improve membrane hydrophilicity, in which the compatibility between the polymers is an important factor affecting the structure and properties of blend membranes. Polyethersulfone (PES)-based blend membranes were prepared from PES/polysulfone (PSf)/N, N-dimethylacetamide (DMAc) and PES/sulfonated polysulfone (SPSf)/DMAc casting solutions with water as coagulant via non-solvent-induced phase inversion, respectively. The compatibility of blend systems and membrane formation processes were investigated through thermodynamics and kinetics analyses. Ultrasonic through-transmission measurements were performed to quantify the rate of membrane formation during the phase inversion process. The effect of SPSf on the compatibility and morphologies of PES-based blend membranes was characterized by Schneier theory, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) etc. Results indicated that the PES/PSf blend system was partially compatible, leading to instantaneous demixing and the obtained membrane with finger-like structure, whereas the PES/SPSf blend system was entirely miscible, resulting in delayed demixing and the obtained membrane with sponge-like asymmetrical gradient structure. Simultaneously, the surface segregation behavior of SPSf with hydrophilic sulfonic acid groups during the mutual diffusion process resulted to the enhancement of PES/SPSf membrane hydrophilicity. Consequently, PES/SPSf blend membrane showed excellent water permeability and better antifouling ability.
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