无定形梳状高分子固体电解质的二重玻璃化转变及典型VTF特征  

Studies on the Two Class Glass Transition and the Typical VTF Behaviour of an Amorphous Comb Polymer Electrolyte

作　　者：丁黎明[1] 石晶[1] 马德柱[1] 董绍俊[1] 

机构地区：[1]中国科学院长春应用化学研究所,东北师范大学分析测试中心,中国科学技术大学材料科学与工程系

出　　处：《高等学校化学学报》1996年第10期1644-1648,共5页Chemical Journal of Chinese Universities

摘　　要：研究了交替马来酸酐共聚物多缩乙二醇酯（ＣＰ３５０）－ＬｉＮＯ３络合物的热行为及离子导电性。实验表明：ＣＰ３５０／ＬｉＮＯ３络合物在所研究的［Ｌｉ］／［ＥＯ］配比范围呈均相无定形并具有二重玻璃化转变。２个玻璃化转变温度均随盐含量的增加而上升。离子电导率随盐浓度的变化出现１个极大值，室温电导率最大可达３．７２×１０－５Ｓ／ｃｍ。导电行为呈典型ＶＴＦ特征。A comb polymer(CP3 50) with oligo-oxyethylene side chains of the type-(CH2 CH2O)7CH3 was prepared from methyl vinyl ether/maleic anhydride copolymer and poly(ethylene glycol) methyl ether.The polymer can dissolve LiNOa3 salt to form homogeneous amorphous polymer electrolyte.This electrolyte system was first found to have two class glass transitions,and the two Tgs were observed to increase with increasing salt content.The ionic conduction was measured by using the complex impedance method,and conductivities were investigated as functions of temperature and salt concentration.At 25℃,the ionic conductivity maximum of this system can get to 3.72×10-5S/cm at the[Li]/[EO]ratio of 0.057.The appearance of the conductivity maximum has been interpreted as being due to the effect of Tg and the so called physical crosslinks.The temperature dependence of the ionic conductivity displaying non-Arrhenius behaviour can be analyzed using the Vogel-Tammann-Fulcher equation and interpreted on the basis of the configurational entropy model.

关 键 词：高分子 固体电解质 二重玻璃化转变 VTF特征 

分 类 号：TM215[一般工业技术—材料科学与工程] O631.2[电气工程—电工理论与新技术]