丙烯酸甲酯/二乙烯基苯接枝交联共聚合改性聚丙烯隔膜

Modification of polypropylene separator by graft crosslinking copolymerization of divinylbenzene and methyl acrylate

研究了在聚丙烯(PP)隔膜表面接枝二乙烯基苯(DVB)/丙烯酸甲酯(MA)交联聚合物网络,提高隔膜高温条件下尺寸稳定性的改性方法。全反射傅立叶红外光谱(ATR-FT-IR)证明DVB和MA在PP隔膜表面发生了聚合反应。考察了接枝共聚合体系中反应时间、反应温度、引发剂浓度等对PP隔膜接枝率和耐热性能的影响。在隔膜表面成功接枝P(DVB-co-MA)的基础上,探索了通过聚合物中DVB结构单元上未反应的双键与KH570发生共聚合反应,在隔膜表面引入SiO2粒子的改性方法。用SEM观察膜表面形貌,结果表明SiO2粒子确实结合到了隔膜中,且该改性方法对隔膜表面孔结构影响不大。热收缩率测试结果表明,改性后膜的尺寸稳定性明显提高,130℃下4 h热收缩率从12%可降低到4%。

This study was about the surface modification of PP separator by introducing crosslinked divinylbenzene（DVB） /methyl acrylate（MA） to increase its thermal dimensional stability.The total reflection Fourier transform infrared spectroscopy（ATR-FT-IR） was used to prove that the copolymerization of DVB and MA did occur on the surface.The influences of reaction time,reaction temperature,concentration of initiator on the grafting ratio and thermal properties of PP separator were explored.Furthermore,KH570 was introduced onto the surface by the copolymerization of DVB and KH570 double bonds,by which the SiO2 particles were also introduced.The pore structure was observed by SEM.The thermal shrinkage of modified separator reduced a lot than before.The shrinkage at 130 ℃ reduced from 12% to 4% in4 h.