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Preparation of PVDF/EVOH blend membranes and analysis of its antifouling ability

Authors： CAI Qiaoyun，WANG Lei，MIAO Rui，WANG Xudong，LV Yongtao

Units： School of Environmental and Municipal Engineering，Xi’an university of Architecture and Technology，Xi’an 710055，Shan’xi，China)

KeyWords： PVDF/ EVOH ultrafiltration membrane；blend；Coagulation bath temperature；Membrane fouling；Interaction force

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(1):28-34

Abstract：

Polyvinylidene fluoride (PVDF)/ethylene vinyl alcohol copolymer (EVOH) blend membranes were prepared by phase inversion. The influence of PVDF/EVOH blend ratio and coagulation bath temperature on the properties of the blend membrane was investigated. Typical foulant probes were used to measure the change of foulant-membrane interaction force before and after the blend modification of PVDF membranes and analyze the antifouling characteristics of the modified membrane. Results show that the optimum blending weight ratio of PVDF/EVOH compatibility was 9/1. The PVDF/EVOH membrane presented more hydrophilic than the pure PVDF membrane. The hydrophilicity and mechanical strength of blend membrane obtained increased with an increase on the coagulation bath temperature during the preparation, whereas its pure water flux decreased. The main reason is that PVDF/EVOH blend membrane with a dense layer in the surface formed. It is also found that the interaction forces between PVDF/EVOH and foulant were much weaker than that those between the pure PVDF membrane and foulant. It suggests that the antifouling ability of PVDF membrane was effectively improved by blending EVOH.

Funds：

国家自然科学基目（No.51178378；No.51278408）陕西省科技创新项目（No.2012KTCL03-06；No.2013KTCL03-16).

AuthorIntro：

蔡巧云（1987-），女，陕西西安人，硕士研究生，西安建筑科技大学环境与市政工程学院,膜科学技术的研究及应用,caicai19871126@126.com.

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