聚丙烯接枝聚乙二醇改性聚丙烯微孔膜

发布时间：2018-04-13 13:27

本文选题：聚丙烯微孔膜 + 聚丙烯接枝聚乙二醇　；参考：《高分子材料科学与工程》2017年08期

【摘要】：以聚丙烯接枝聚乙二醇(PP-g-PEG)对聚丙烯共混改性,通过单向拉伸工艺制备亲水性聚丙烯微孔膜。使用压汞仪、扫描电镜、Gurley值和水蒸气透过率表征微孔膜的孔结构和透过性能,研究PP-g-PEG含量、PEG接枝率及链长对微孔膜孔结构、水蒸汽透过率及锂电池性能的影响。结果表明,对于接枝率为0.78%的PP-g-PEG,随着添加剂PP-g-PEG含量增加,微孔膜孔隙率和微孔尺寸下降,反映孔道结构的曲挠度及喉孔比上升;微孔膜孔结构与亲水性的综合作用导致水蒸气透过率在PP-g-PEG含量为2.5%时达到最大值。PP-g-PEG含量为2.5%和5.0%的微孔膜组装的锂电池具有较低的电荷转移电阻和较高的充放电比容量,电池性能优于未改性微孔膜组装的电池。提高PEG接枝率使得改性微孔膜孔结构有所变差,但是水蒸气透过率提高,组装电池的性能也更好。长PEG侧链PP-g-PEG对微孔膜孔结构的破坏程度大于短PEG侧链PP-g-PEG,导致组装电池的性能变差。
[Abstract]:The hydrophilic polypropylene microporous membrane was prepared by uniaxial stretching process by blending polypropylene with polypropylene graft polyethylene glycol (PP-g-PEG).The pore structure and permeability of the microporous membrane were characterized by scanning electron microscope (SEM) Gurley value and water vapor transmittance. The effects of PP-g-PEG content and chain length on the pore structure, water vapor transmittance and the performance of lithium battery were studied.The results showed that for PP-g-PEG with grafting ratio of 0.78%, the porosity and pore size of microporous membrane decreased with the increase of PP-g-PEG content, which reflected the increase of the bending deflection of pore structure and the ratio of throat to pore.The combination of the pore structure and hydrophilicity of the microporous membrane resulted in the maximum water vapor transmittance when the content of PP-g-PEG was 2.5. The lithium battery assembled with 2.5% PP-g-PEG and 5.0% microporous film had lower charge transfer resistance and higher charge / discharge capacity.The performance of the battery is better than that of the unmodified microporous membrane.Increasing the graft ratio of PEG makes the pore structure of the modified microporous membrane worse, but the water vapor transmittance is improved, and the performance of the assembled battery is better.The damage degree of long PEG side chain PP-g-PEG to the pore structure of microporous membrane is greater than that of short PEG side chain PP-g-PEG, which leads to the deterioration of the performance of the assembled battery.
【作者单位】：常州大学材料科学与工程学院;
【基金】：江苏高校优势学科建设工程资助项目
【分类号】：O632;TM912

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