Glass Transition and Relaxation Processes of Nanocomposite Polymer Electrolytes
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- 作者：Benson K. Money ; K. Hariharan ; Jan Swenson
- 刊名：The Journal of Physical Chemistry B
- 出版年：2012
- 出版时间：July 5, 2012
- 年：2012
- 卷：116
- 期：26
- 页码：7762-7770
- 全文大小：476K
- 年卷期：v.116,no.26(July 5, 2012)
- ISSN：1520-5207
文摘
This study focus on the effect of 未-Al2O3 nanofillers on the dc-conductivity, glass transition, and dielectric relaxations in the polymer electrolyte (PEO)4:LiClO4. The results show that there are three dielectric relaxation processes, 伪, 尾, and 纬, in the systems, although the structural 伪-relaxation is hidden in the strong conductivity contribution and could therefore not be directly observed. However, by comparing an enhanced dc-conductivity, by approximately 2 orders of magnitude with 4 wt % 未-Al2O3 added, with a decrease in calorimetric glass transition temperature, we are able to conclude that the dc-conductivity is directly coupled to the hidden 伪-relaxation, even in the presence of nanofillers (at least in the case of 未-Al2O3 nanofillers at concentrations up to 4 wt %). This filler induced speeding up of the segmental polymer dynamics, i.e., the 伪-relaxation, can be explained by the nonattractive nature of the polymer鈥揻iller interactions, which enhance the 鈥渇ree volume鈥?and mobility of polymer segments in the vicinity of filler surfaces.