聚丙烯/聚硅氧烷-二氧化硅中空纤维膜的制备与性能分析
Preparation and analysis of polypropylene/polysiloxane-silica hollow fiber membrane
阳梦萍 1孙军军 1张晨曦 1薛昊龙 1肖长发2
作者信息
- 1. 上海工程技术大学纤维材料研究中心,上海 201620
- 2. 上海工程技术大学纤维材料研究中心,上海 201620;天津工业大学材料科学与工程学院,天津 300387
- 折叠
摘要
为了提高气液分离用聚丙烯(PP)微孔膜的疏水性能,本研究将聚硅氧烷-二氧化硅纳米粒子和聚丙烯树脂熔融共混,采用熔融-拉伸法制备疏水聚丙烯中空纤维膜,进行了差示扫描量热仪、综合热分析仪、扫描电子显微镜、原子力显微镜、孔隙率、水接触角、气体/纯水通量等测试与表征,研究了不同含量的聚硅氧烷-二氧化硅对中空纤维膜结构和性能的影响.结果表明,随着聚硅氧烷-二氧化硅质量分数的增加,膜的水接触角逐渐增大,平均孔径、纯水通量和气体通量均呈现先增大后减小的趋势.当聚硅氧烷-二氧化硅质量分数为2%时,膜的水接触角从108.6°增加到127.6°,表明PP微孔膜的疏水性能得到明显改善.膜孔隙率为59.4%,气体通量为61.76L/(m2∙s),是纯PP膜的2.16倍.同时聚硅氧烷-二氧化硅可以起到异相成核的作用,改善聚丙烯PP微孔膜的退火效果,使主片层结构变得稳定,孔结构依然由分离的片晶组成.
Abstract
To improve the hydrophobic performance of polypropylene(PP)microporous membranes for gas-liquid separation,the polysiloxane-silica and polypropylene resin were blended and made into hydrophobic polypropylene hollow fiber membranes by the melt-stretching method.DSC,TGA,SEM,AFM,porosity,water contact angle and gas/pure water fluxes were carried out to investigate the effect of polysiloxane-silica contents on the structure and performance of the hollow fiber membrane.The results showed that as the polysiloxane-silica content increased,the water contact angle of the membrane gradually increased,and the average pore size,pure water flux and gas flux indicated a trend of increasing and then decreasing.When the polysiloxane-silica content increased from 0 to 2%,the water contact angle of the membrane increased from 108.6° to 127.6°,indicating that the hydrophobicity of the PP microporous membrane was significantly improved.The membrane porosity was 59.4%,and the gas flux was 61.76L/(m2∙s),which was 2.16 times that of the pure PP membrane.Additionally,the polysiloxane-silica played the role of heterogeneous nucleation,improved the annealing effect,and made the structure of the main lamellae stable.The pore structure still consisted of separated lamellae crystals.
关键词
聚硅氧烷/二氧化硅/聚丙烯微孔膜/疏水性Key words
polysiloxane/silica/polypropylene microporous membrane/hydrophobicity引用本文复制引用
基金项目
国家自然科学基金面上项目(52173038)
中国石化集团公司项目(321092)
大学生创新训练项目(CX2309015)
出版年
2024
国家科技期刊平台
NSTL
万方数据