以聚丙烯接枝马来酸酐(PP-g-MAH)为改性剂与聚丙烯熔融共混,通过单向拉伸工艺制备亲水性聚丙烯微孔膜.使用差示扫描量热仪和红外光谱表征流延基膜的取向片晶结构,使用压汞仪和扫描电镜表征微孔膜的孔结构,使用Gurley值、水接触角和水蒸气透过率表征微孔膜的透过性和亲水性,将微孔膜组装成电池并测定电池的性能,研究PP-g-MAH含量对微孔膜孔结构、亲水性、透过率及电池性能的影响.结果表明,PP-g-MAH共混含量为2.5％的微孔膜孔隙率和透气性得到提升,进一步增加PP-g-MAH含量会导致微孔膜孔结构变差,透过性能下降.微孔膜表面亲水性随PP-g-MAH含量增加持续改善,水蒸气透过率在PP-g-MAH含量为5％时达到最大值,但由于微孔膜孔结构在较高PP-g-MAH含量下受到破坏,使得高PP-g-MAH含量下微孔膜水蒸气透过率下降.PP-g-MAH含量为2.5％和5％的微孔膜由于具有较好的孔结构和一定的电解液浸润性,使得锂电池的电荷转移电阻较低,首次充放电比容量较高.
Cast films based on polypropylene blended with self-made maleic anhydride grafted polypropylene(PP-gMAH) at different mass ratios were prepared by melt extrusion.The films were used to produce hydrophilic microporous membranes by uniaxial stretching.The oriented lamellar structure of the cast films was characterized by DSC and FT-IR.The pore structure of microporous membranes was analyzed by SEM and mercury porosimetry.Permeability and hydrophilicity were measured through Gurley,water contact angle and water vapor permeability.The membranes were assembled into the battery and the performance of the battery was determined.The change of pore structure,hydrophilicity,permeability and electrochemical properties caused by addition of PP-g-MAH was studied.Hydrophilicity is improved with increase of the PP-g-MAH content.Water vapor permeability comes to the maximum at the PP-g-MAH content of 5 ％,while it gets worse because the pore structure is destroyed at the high content of PP-g-MAH.It is found that complex impedance and specific capacity of the cells with 2.5 ％ and 5 ％ PPg-MAH modified separator perform better,since of good pore structure and electrolyte compatibility.
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