摘要
将聚乙烯吡咯烷酮(PVP)与聚(乙烯-乙烯醇)(EVAL)共混,采用浸没沉淀法制备了PVP/EVAL共混膜,并用于油水乳液分离过程。通过全反射红外光谱、扫描电子显微镜、拉伸试验、接触角测试等对膜的组成、结构形态、机械性能、亲水性进行了表征,并研究了PVP添加量对共混膜油水分离性能的影响。结果表明:添加PVP能较显著地改变EVAL膜的结构,且共混膜的机械强度和亲水性得到明显改善,当PVP添加量为10 wt%(PVP在铸膜液中的质量分数)时,其拉伸强度和断裂伸长率分别为纯EVAL膜的1.88倍和1.34倍。当PVP添加量为4 wt%时,油水分离稳定通量为纯EVAL膜的1.81倍,截留率为92.2%,比纯EVAL膜略高。PVP添加量为10 wt%的PVP/EVAL共混膜清洗后通量恢复率由纯EVAL膜的51%增至77.98%。
PVP/EVAL blend membranes were prepared by blending PVP with poly（ethylene covinyl alcohol） （EVAL） via immersion precipitation and were used to separate the oil/water emulsion. The chemical structure,morphology,mechanical performance and hydrophilicity of PVP/EVAL blend membranes were characterized by FTIR ATR,scanning electron microsco py,tension test and water contact angle measurement. The effect of PVP content on the separa tion performance of oil/water emulsion was investigated. The results indicate that PVP content had a distinct effect on the morphology of PVP/EVAL membranes. The tensile strength and elon gation at break of PVP/EVAL blend membrane with 10 wt% （the mass percent of PVP in the casting solution） PVP were 1.88 and 1.34 times,respectively,of that of pure EVAL membrane. When the content of PVP increased to 4 wt%,oil/water emulsion flux of PVP/EVAL blend membrane was 1.81 times of that of the pure EVAL membrane. The rejection ratio was 92.2%, slightly higher than the pure EVAL membranes. When the content of PVP increased to 10 wt%, the flux recovery ratio after washing increased from 51%to 77.98%.
出处
《中国工程科学》
北大核心
2014年第7期79-83,88,共6页
Strategic Study of CAE
基金
国家自然科学基金项目(21106053)
