采用共混-改性接枝法进行了亲水膜制备研究,以聚对苯二甲酸乙二醇酯(PET)为铸膜液原料,与三氯化铁共混成膜后,将硬脂酸改性后的纳米SiO2接枝到共混膜上,制备出强亲水性的改性接枝膜,使用光学显微镜、接触角测量仪对亲水膜的均匀性及亲水性进行表征。结果表明:当PET塑料块含量为3.5%,搅拌时间6h时,制备的原膜分布均匀,接触角为76.45°。当在铸膜液中添加三氯化铁的含量为0.6%时,制备的共混膜接触角降至13.26°,以m(硬脂酸)∶m(纳米SiO2)=0.125的配比改性纳米SiO2,接枝24h,改性接枝膜接触角由13.26°下降到0°,表现出强亲水性。三氯化铁与PET铸膜液共混,接枝硬脂酸改性的纳米SiO2后,明显提高了PET原膜表面的亲水性。
The preparation of hydrophilic membranes was studied by blending-modified grafting.Using PET as a raw material for the casting solution,after blending with ferric chloride to form a film,the nano-silica modified with stearic acid was grafted onto the blended film to prepare a highly hydrophilic modified graft film.The films were characterized by optical microscope and contact angle measuring instrument.The results shown that when the PET mass was 2.4g and the stirring time was 6h,the prepared original film was evenly distributed,and the contact angle was 76.45°.When 0.3g of ferric chloride was added to the casting solution,the contact angle of the film was decreased from 56.39° to 13.26°.The nano-silica was modified by the ratio of m(stearic acid)∶m(nano-silica)=3∶20,and grafted for 24h,the contact angle of the modified graft film decreased from 13.26° to 0°.The strong hydrophilicity was shown.The ferric chloride was blended with the PET casting solution,and the hydrophilicity of the surface of the PET original film was obviously improved after the grafting of the stearic acid-modified nano-silica.
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基金资助
四川理工学院研究生创新基金资助项目(y2018058);国家公安部重点项目(2017JSYJA14)
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