【摘要】 采用强氧化剂预处理-氧化还原引发接枝聚合法将丙烯酸(AA)接枝到聚丙烯(PP)镍氢电池隔膜表面,以改善其亲水性。扫描电镜(SEM)和衰减全反射红外光谱(ATR-FT-IR)分析结果表明,已制得PP-g-AA改性隔膜。考察了不同接枝率改性隔膜的亲水性和电导率,结果表明,接枝丙烯酸显著改善了其亲水性,接枝率为4.10%时隔膜亲水性最好,对去离子水和KOH水溶液(密度1.30g/cm3)的接触角从PP基膜的102.2°和113.5°降至0°和23.9°;接枝率为2.82%和4.10%改性隔膜的电导率达到基膜的1.5倍以上。镍氢电池循环测试表明,改性隔膜装配的电池具有较高的电池容量和循环寿命。综合考虑,接枝率为4.10%时隔膜性能最佳。更多还原

【Abstract】 Acrylic acid(AA) was grafted onto the surface of polypropylene(PP) MH-Ni battery separator to improve hydrophilicity by strong oxidant pretreatment-redox initiationgraft polymerization. The analysis of scanning electron microscope (SEM) and attenuated total reflection infrared spectrum (ATR-FT-IR) shows that PP-g-AA modified separator was prepared. The influence of grafting ratio on hydrophilicity and conductivity of PP-g-AA mod-i fied separator were investigated. It is shown that the hydrophilicity of PP separator is effectively improved by grafting polyacrylic acid,the modified separator with the grafting ratio of 4.10% exhibits the best hydrophilicity,its contact angles of deionized water and KOHaqueous solution with specific gravity of 1.30g/cm3decrease from 102.2°and 113.5°to 0°and 23.9°,respectively. The conductivities of modified separator with the grafting ratio of 2.82% and 4.10% are 1.5 times higher than of PP separator. The performance test of MH-Ni battery shows that batteries assembled with the modified separators exhibit higher capacity and better cycling performance. Polyacrylic acid grafting modified separator reaches the best performance when the grafting ratio is 4.10%.更多还原