Softening behavior and conductivity in ionene polymer glasses
Softening behavior and conductivity in ionene polymer glasses
复制标题
紫罗烯聚合物玻璃的软化行为和电导率
DOI：
10.1002/pat.1993.220040216
复制
发表时间：
1993
影响因子：
3.4
通讯作者：
W. Meyer
中科院分区：
文献类型：
--
作者：
R. Rietz;W. Meyer
碘油玻璃被认为是一类新的材料。它们的性能进行了详细的研究，热分析，固态核磁共振，和介电技术。这些阳离子聚电解质，标记在选定的位置，链段动力学进行了研究与固态2 H-NMR。低于玻璃化转变，聚合物主链中的季铵基团由于强库仑相互作用而基本上是静态的。这些材料中的玻璃化转变的特征在于由N+阳离子形成的网络的软化。然而，低分子量抗衡离子和连接铵基团的有机链段在低于Tg时已经是移动的。在玻璃态的有机段的动力学可以被描述为固定端之间的运动。玻璃态的离子电导率是基于热激活的阴离子传输。讨论了有机链段的柔性和阴离子的类型对电导率的影响。提出了一个简单的解析表达式来描述低频极限下的电导率行为。
Ionene glasses are considered as being a new class of materials. Their properties have been investigated in detail by thermoanalytical, solid state NMR, and dielectric techniques. The segmental dynamics of these cationic polyelectrolytes, labeled in chosen positions, have been studied with solid state 2H-NMR. Below the glass transition the quaternized ammonium groups in the polymer backbone are essentially static, due to strong Coulomb interactions. The glass transition in these materials is characterized by the softening of a network formed by the N+-cations. However, both the low molecular weight counterions and the organic chain segments linking the ammonium groups are already mobile below Tg. The dynamics of the organic segments in the glassy state can be described as motion between fixed ends. Ionic conductivity in the glassy state is based on thermally activated anion transport. The influence of the flexibility of the organic chain segments and of the type of the anion on the conductivity are discussed. A simple analytic expression is proposed to describe the conductivity behavior in the low frequency limit.