含硅氢键聚二硅氧烷/聚醚共混聚合物电解质 Ⅱ.PSEMH对PEO结晶性能及离子电导率的影响  

Polysilaether Containing Moiety Si—H Bonds in the Side Chain/PEO Composite Polymer Electrolyte Ⅱ.Effects of PSEMH on the Crystallization Properties of PEO and Ionic Conductivity of PEO-PSEMH-LiClO_4

作　　者：崔孟忠[1,2] 李竹云[3] 张洁[1] 冯圣玉[1] 

机构地区：[1]山东大学化学化工学院,济南250100 [2]烟台大学化工材料研究所,烟台264005 [3]烟台大学应用化学系,烟台264005

出　　处：《化学学报》2009年第24期2851-2856,共6页Acta Chimica Sinica

基　　金：山东省博士后科研择优项目(No.200603075);烟台大学博士基金(No.HY05B33)资助项目

摘　　要：通过Raman,DSC和XRD等方法对聚氯乙烯醚-侧链含一半硅氢键的羟基封端聚二硅氧烷-高氯酸锂(PEO-PSEMH-LiClO4)全固态共混聚合物电解质进行了研究,结果表明侧链含一半硅氢键的羟基封端聚二硅氧烷(PSEMH)能够显著地降低PEO-LiClO4电解质体系的PEO的结晶性和玻璃化转变温度,同时PSEMH分子的二硅醚链节中氧原子与Li+间具有配位作用,从而大幅提高x%PEO～y%PSEMH-LiClO4(本文中x%,y%分别为PEO和PSEMH占两种聚合物的质量分数)电解质在低温区的离子电导率.而当PSEMH交联硫化之后,虽然降低了PEO的结晶度和Tg,但是由于PSEMH的交联网络限制了聚合物链段的运动性,使得电解质的离子电导率在低温区高于100%PEO-LiClO4(约为12倍),而在高温区则低于100%PEO-LiClO4,充分证明了PSEMH对电解质的离子电导率具有显著的贡献作用.Interactions between polysilaether containing moiety Si—H bonds in the side chain （PSEMH） chains and polyethylene oxide （PEO） in PEO-PSEMH-LiClO4 solid-state composite polymer electrolytes were studied by Raman, DSC and XRD techniques. The experimental result shows that PSEMH can inhibit the crystalline nature of PEO and reduce its glass transition point at the same time, then enhancing the ionic conductivity of the composite polymer electrolytes largely at lower temperature. In addition, the oxygen atoms of SiSiO chain in PSEMH have coordination with Li＋. After PSEMH was crosslinked, the crystalline nature of PEO was inhibited and its glass transition point also reduced. The ionic conductivity of the composite polymer electrolytes was higher than that of 100% PEO-LiClO4 （about 12 times） at lower temperature, however, at high temperature the ionic conductivity of 100% PEO-LiClO4 was higher than that of composite polymer electrolytes, proving that the polymer PSEMH has a significant contribution to the ionic conductivity of composite polymer electrolyte.

关 键 词：共混聚合物电解质 侧链含一半硅氢键的羟基封端聚二硅氧烷(PSEMH) 离子电导率 结晶度 

分 类 号：O631.3[理学—高分子化学]