Transmission Performance and Free Volume of Gel Electrolyte Membranes Based on Comb-like Methyl Methacrylate Copolymers

doi:10.6023/A1108281

Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (06): 783-788.DOI: 10.6023/A1108281 Previous Articles Next Articles

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梳状丙烯酸酯类共聚物凝胶电解质的传输性能与自由体积

周华龙^a, 马晓燕^a, 王毅霏^a, 管兴华^a, 王波^b

a 西北工业大学理学院应用化学系西安 710129;
b 武汉大学物理科学与技术学院武汉 430072

投稿日期:2011-08-28 修回日期:2011-10-27 发布日期:2011-12-06
通讯作者: 马晓燕
基金资助:
陕西省自然基金重点项目(No. 2009JZ004)、校基础研究基金(No. JC201158)和研究生创业种子基金(No. Z2011015)资助项目.

Transmission Performance and Free Volume of Gel Electrolyte Membranes Based on Comb-like Methyl Methacrylate Copolymers

Zhou Hualong^a, Ma Xiaoyan^a, Wang Yifei^a, Guan Xinghua^a, Wang Bo^b

a Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710129;
b School of Physics and Technology, Wuhan University, Wuhan 430072

Received:2011-08-28 Revised:2011-10-27 Published:2011-12-06
Supported by:
Project supported by the key project of Natural Science Foundation of Shaanxi Province (No. 2009JZ004), the NPU Foundations for Fundamental Research (No. JC201158) and graduate starting seed fund of Northwestern Polytechnical University (No. Z2011015).

Three comb-like methyl methacrylate copolymer matrixes for gel polymer electrolyte (GPE) were synthesized by reacting methyl methacrylate-maleic anhydride copolymer (P(MMA-co-MAh)) with poly(ethylene glycol) monomethylether (PEGME) of different molecular weight (350, 600, and 750), respectively. Three kinds of GPE membranes made from comb-like copolymers as matrix, shorted for CL350, CL600, CL750, propylene carbonate (PC) as plasticizer and LiClO₄ as salt, have been prepared by solution casting technique. By studying the ion transporting properties of the GPE, it is found that the conduction mechanism of the GPE accords with VTF (Vogel-Tamman-Fulcher) equation, which is derived from free volume theory. Positron annihilation lifetime spectroscopy (PALS) was employed to analyze the properties of free volume in GPE systems and the effect of microstructure on conductivity of GPE membranes. It is noted that increasing the side chain length of polymer matrixes will increase the free volume existed in system. When the content of polymer matrix is 45 wt%, free volume in CL750 based GPE membrane is 21% larger than that in CL350 based GPE membrane. Correspondingly, compared with CL350 system, the ionic conductivity of CL750 system grows by 200%. It is apparent that the ionic conductivity of GPE membranes is affected by the structure of polymer matrix to a great extent.

Key words: comb-like copolymer, gel polymer electrolyte, positron annihilation, free volume, conduction mechanism

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Zhou Hualong, Ma Xiaoyan, Wang Yifei, Guan Xinghua, Wang Bo. Transmission Performance and Free Volume of Gel Electrolyte Membranes Based on Comb-like Methyl Methacrylate Copolymers[J]. Acta Chimica Sinica, 2012, 70(06): 783-788.

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梳状丙烯酸酯类共聚物凝胶电解质的传输性能与自由体积

Transmission Performance and Free Volume of Gel Electrolyte Membranes Based on Comb-like Methyl Methacrylate Copolymers

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