PET薄膜表面多孔结构的有效调控及成孔工艺

Effective controlling of porous structure on PET film surface and pore formation mechanism

为探究不同工艺条件对聚苯二甲酸乙二醇酯(PET)薄膜表面成孔的影响,以PET薄膜为基材,采用涂覆法将致孔剂聚乙二醇(PEG)添加到PET薄膜中,通过对PEG的质量分数、萃取液组成、萃取浸泡时间、PEG分子质量大小等工艺条件的优化,得到具有不同孔径结构且均匀分布的PET多孔薄膜;采用S4800型场发射扫描电镜(SEM)、DSA100型全自动微观动态接触角测量仪和万能拉伸仪对样品的表面形貌及性能进行测试与分析。结果表明:通过优化成孔工艺,将膜浸泡在V_(乙醇)∶V_(丙三醇)=4∶1的混合溶液中,浸泡超过72 h,制备的PET多孔薄膜成孔性较好;在刮膜液中添加质量分数为8%的PEG,PET薄膜表面可以得到均匀一致的微孔;通过调控PEG的分子质量可使多孔薄膜表面具有50~300 nm不同孔径尺寸的微孔,可以实现PET薄膜表面微孔的有效调控,同时薄膜表面的亲疏水性也发生改变。

To explore the influence of different process conditions on the porous surface of polyethylene terephthalate(PET)film,PET film was used as the base material,and the porogenic agent polyethylene glycol(PEG)was added into PET film by coating method.The PET porous film with different pore size structure and uniform dispersion was obtained by the process optimization of PEG mass percentage,extraction liquid proportion,extraction soaking time,selection of PEG molecular weight.S4800 field emission scanning electron microscope(SEM),DSA100 automatic micro-dynamic contact angle measuring instrument and universal tensile machine were used to test and analyze the surface morphology and properties of the samples.The results showed that the pore forming properties of the prepared films were better when the films were immersed in the mixed solution of V_(ethanol)∶V_(glycerol)=4∶1 for more than 72 h.When PEG with a mass percentage of 8%was added to the scraping solution,uniform micropores were obtained on the surface of PET film.By adjusting the relative molecular weight of PEG,the film surface can be equipped with micropores of different pore sizes of 50-300 nm,which can effectively control the micropores on the surface of PET film,and the hydrophilicity and hydrophobicity of the film surface can also be changed.