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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of poly(vinyl chloride)/polystyrene/ poly(ethylene glycol) hollow-fiber ultrafiltration membranes
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Preparation and characterization of poly(vinyl chloride)/polystyrene/ poly(ethylene glycol) hollow-fiber ultrafiltration membranes

机译：聚氯乙烯/聚苯乙烯/聚乙二醇中空纤维超滤膜的制备与表征

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摘要

Hollow-fiber ultrafiltration (UF) membranes were prepared from blends of poly(vinyl chloride) (PVC) and polystyrene (PS) with a dry/wet phase inversion method. Poly(ethylene glycol) (PEG) and N,N-dimethylacetamide were used as the additive and solvent, respectively. The effects of the PEG concentration in the dope solution as an additive on the cross sections and inner and outer surface morphologies, permeability, and separation performance of the hollow fibers were examined. The mean pore size, pore size distribution, and mean roughness of both the inner and outer surfaces of the produced hollow fibers were determined by atomic force microscopy. Also, the mechanical properties of the hollow-fiber membranes were investigated. UF experiments were conducted with aqueous solutions of poly(vinyl pyrrolidone) (PVP; K-90, M_w = 360 kDa). From the results, we found that the PVC/PS hollow-fiber membranes had two layers with a fingerlike structure. These two layers were changed from a wide and long to a thin and short morphology with increasing PEG concentration. A novel and until now undescribed shape of the nodules in the outer surfaces, which was denoted as a sea-waves shape, was observed. The outer and inner pore sizes both increased with increasing PEG concentration. The water permeation flux of the hollow fibers increased from 104 to 367 L m~(-2) h~(-1) bar ~(-1)) at higher PEG concentrations. The PVP rejection reached the highest value at a PEG concentration of 4 wt %, whereas at higher values (from 4 to 9 wt %), the rejection decreased. The same trend was found also for the tensile stress at break, Young's modulus, and elongation at break of the hollow fibers.
机译：中空纤维超滤（UF）膜是采用干/湿相转化法由聚氯乙烯（PVC）和聚苯乙烯（PS）的混合物制成的。聚（乙二醇）（PEG）和N，N-二甲基乙酰胺分别用作添加剂和溶剂。检查了添加剂溶液中PEG浓度作为添加剂对中空纤维的横截面和内外表面形态，渗透性和分离性能的影响。通过原子力显微镜法测定所制得的中空纤维的内外表面的平均孔径，孔径分布和平均粗糙度。而且，研究了中空纤维膜的机械性能。用聚乙烯基吡咯烷酮（PVP; K-90，M_w ＝ 360kDa）的水溶液进行超滤实验。从结果中，我们发现PVC / PS中空纤维膜具有两层具有指状结构的层。随着PEG浓度的增加，这两个层从宽和长形态变为薄和短形态。观察到外表面中结节的新颖且至今未描述的形状，其被称为海浪形状。内孔和内孔均随PEG浓度增加而增加。在较高的PEG浓度下，中空纤维的透水通量从104升至367 L m〜（-2）h〜（-1）bar〜（-1））。 PVP排斥在PEG浓度为4 wt％时达到最高值，而在更高的值（从4到9 wt％）下，排斥率降低。对于中空纤维的断裂拉伸应力，杨氏模量和断裂伸长率也发现了相同的趋势。

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