膜科学与技术

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Study on the influence factors of properties and microstructure in chlorinated polyvinyl chloride membrane

Authors： LV Xiaoning, WANG Jun

Units： College of Environmental Science and Engineering，State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry，Donghua University，Shanghai 201620，China

KeyWords： chlorinated polyvinyl chloride (CPVC); microstructure; property; processing conditions

ClassificationCode：TQ325.3

year,volume(issue):pagination： 2016,36(3):54-61

Abstract：

In this paper, chlorinated polyvinyl chloride (CPVC) membrane was prepared by the phase inversion method, then studied and discussed the influence of membrane processing conditions (polymer content of the casting solution, the casting solution temperature, the gel bath composition and the the gel bath temperature) on microstructure and performance of CPVC membrane. It was found that polymer concentration and casting solution temperature didn't show obvious infection on the microstructure and performance of CPVC membrane.And the CPVC membrane, which had dense layer surface and macroporous support layer in the cross-section and nonporous surface, was asymmetric in the research area. In addition, the performance of CPVC membrane reached a maximum at 18 wt% polymer concentration and 70°C of the casting solution temperature. The gel bath composition played an important role in the influence of the microstructure and performance of CPVC membranes. The membrane was asymmetric, which had dense skin, sponge-like structures and nonporous surface, when the solvent content in the gel bath was lower than 60%. When the solvent concentration reached 80%, the membrane, which had skin and large conical macroporous support in the cross-section and small holes in the membrane surface, was asymmetric. The temperature of the gel bath showed obvious infection on the microstructure. When the gel bath temperature was 30°C, large conical macroporous membrane structure was changed into sponge-like structure. In addition, with increasing temperature of gel bath, the skin and sponge-like structures were denser, the water flux of CPVC membrane was lowered, and retention rate of membrane was improved. It was found that the retention rate was always above 87%, namely the average pore diameter of CPVC was lower than 10 nm, and the minimum water flux was 111 L•m-2•h-1 in the research area, while the maximum water flux was 1297 L•m-2•h-1. The results showed that the properties of CPVC membrane were much better than PVC membrane.

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AuthorIntro：

第一作者简介：吕晓宁（1989-）,女,河北石家庄人,硕士研究生,研究方向为膜分离技术,E-mail:lvxiaoning.com@163.com 联系作者： E-mail:wangj@dhu.edu.cn

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