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首页> 外文期刊>Applied Surface Science >Preparation of hydrophilic PVDF/PPTA blend membranes by in situ polycondensation and its application in the treatment of landfill leachate
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Preparation of hydrophilic PVDF/PPTA blend membranes by in situ polycondensation and its application in the treatment of landfill leachate

机译：原位缩聚制备亲水性PVDF / PPTA共混膜及其在垃圾渗滤液处理中的应用

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High modulus poly(p-phenylene terephtalamide) (PPTA) reinforced composites are of great scientific interests. But the thermodynamic difference makes the polymer pairs incompatible and endows the composites with inferior physical-chemical properties. In this study, hydrophilic poly(vinylidene fluoride) (PVDF)/poly(p-phenylene terephtalamide) (PPTA) blend membrane with improved hydrophilicity and mechanical strength was prepared through in situ polycondensation of p-phenylene diamine (PPD) and terephthaloyl chloride (TPC) in PVDF solution and subsequent immersion precipitation phase inversion process. The effects of PPTA concentration in polymer dopes on membrane formation process, structure, morphology and performance were systematically investigated. The results showed that thermodynamically, PPTA acted as a demixing enhancer which accelerated the phase inversion process. Dynamically, liquid-liquid phase separation was still in control of membrane formation process especially in the later period, whereas the addition of PPTA mainly promoted the early emergence of the liquid-liquid demixing. The surface hydrophilicity, ant-fouling properties and mechanical strength were significantly improved when PPTA content was 17 wt%. When PPTA content increased to 26 wt%, membrane bursting pressure increased to nearly 0.6 MPa which was 1.5 times higher than that of PVDF membrane. The resultant PVDF/PPTA blend membrane exhibited an improved antifouling property than that of PVDF membrane when applied in the MBR in the treatment of landfill leachate and also showed a relatively high removal rate of chemical oxygen demand (COD) and chrom. (C) 2015 Elsevier B.V. All rights reserved.
机译：高模量聚对苯二甲酰对苯二酰胺（PPTA）增强复合材料具有重大的科学意义。但热力学差异使聚合物对不相容，并使复合材料的物理化学性能较差。在这项研究中，通过对苯二胺（PPD）和对苯二甲酰氯的原位缩聚制备了亲水性和机械强度得到改善的亲水性聚偏二氟乙烯（PVDF）/聚对苯二甲酰对苯二酰胺（PPTA）共混膜。 TPC）在PVDF溶液中，然后进行沉浸沉淀相转化过程。系统地研究了聚合物浓液中PPTA浓度对膜形成过程，结构，形态和性能的影响。结果表明，在热力学上，PPTA起到了促进相转化过程的混合作用。在动力学上，液-液相分离仍在膜形成过程的控制中，尤其是在后期，而PPTA的加入主要促进了液-液分离的早期出现。当PPTA含量为17wt％时，表面亲水性，防污性能和机械强度得到显着改善。当PPTA含量增加到26wt％时，膜破裂压力增加到接近0.6MPa，这是PVDF膜的1.5倍。当将所得的PVDF / PPTA共混膜应用于MBR来处理垃圾渗滤液时，其抗污垢性优于PVDF膜，并且还显示出较高的化学需氧量（COD）和铬去除率。 （C）2015 Elsevier B.V.保留所有权利。

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