双向拉伸温度对湿法隔膜拉伸过程中相畴结构的影响  

Effect of biaxial stretching temperature on phase structure of wet separators during stretching process

作　　者：胡玉涛 王磊 马克 宋红芹 王莉 柳青 万彩霞 孟令蒲[2] HU Yutao;WANG Lei;MA Ke;SONG Hongqin;WANG Li;LIU Qing;WAN Caixia;MENG Lingpu(Lucky Film Co,Ltd,Hebei New Energy Membrane Material Technology Innovation Center,Baoding New Energy Membrane Material Technology Innovation Center,Baoding 071054,China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China)

机构地区：[1]乐凯胶片股份有限公司,河北省新能源膜材料技术创新中心,保定市新能源膜材料技术创新中心,河北保定071054 [2]中国科学技术大学国家同步辐射实验室,合肥230029

出　　处：《中国塑料》2022年第10期33-38,共6页China Plastics

摘　　要：通过系统改变纵向(MD)、横向(TD)拉伸温度,制得了经不同拉伸温度双向拉伸后的湿法隔膜,并通过扫描电子显微镜(SEM)、透气度仪、泡点法膜孔径分析仪对湿法隔膜表观形貌、孔隙结构、透气性能进行了表征和测试,此外利用差示扫描量热仪(DSC)表征了湿法隔膜内部微观晶体的结晶度。结果表明,纵向拉伸温度的改变几乎对湿法隔膜孔径无影响,湿法隔膜孔径只与横向拉伸温度密切相关,随着横向拉伸温度由90℃升高至120℃,孔径由18.3 nm增大至45.4 nm;受孔径的影响,湿法隔膜的透气度由149.8 s降低至62.2 s,两者呈现较好的线性关系;当横向拉伸温度为120℃时,湿法隔膜内部发生熔融重结晶,结晶度由之前的17%增大至20%,此时湿法隔膜内部为由串晶构成的三维网络结构。The biaxially stretched wet separators were prepared at different stretching temperatures through systematically changing the stretching temperature in the longitudinal and transverse directions,and their internal pore appearance,pore structure,and air permeability were characterized using scanning electron microscope,the Gurley's instrument,and pore size analyzer.In addition,differential scanning calorimetry was used to analyze the crystallinity of the micro-crystals inside the wet separators.The results indicated that there was no effect from the change of the longitudinal stretching temperature on the pore size of the wet separators.The pore size of the wet separators was only closely related to the transverse stretching temperature.As the transverse stretching temperature increased from 90 to 120℃,the pore size increased from 18.3 to 45.4 nm.Owing to a change in pore size,the air permeability of the wet separators decreased from 149.8 to 62.2 s,both of which exhibited a good linear relationship.When the transverse stretching temperature was 120 ℃,the melting and re-crystallization occurred inside of the wet separators,resulting in an increasing in the degree of crystallinity from 17%to 20%.Meanwhile,the interior of the separators showed a three-dimensional network structure comprising the shish-kebab crystals.

关 键 词：湿法隔膜 拉伸温度 孔隙 透气度 串晶 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]