INTERACTIONS AMONG COMPONENTS AND GELATION OF PVDF-BASED GEL ELECTROLYTES

WANG Guojie; PAN Huiming

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INTERACTIONS AMONG COMPONENTS AND GELATION OF PVDF-BASED GEL ELECTROLYTES

Research Article | 更新时间：2021-03-19

- INTERACTIONS AMONG COMPONENTS AND GELATION OF PVDF-BASED GEL ELECTROLYTES
- Acta Polymerica Sinica Issue 6, Pages: 702-705(2001)
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- Published：20 December 2001，
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WANG Guojie, PAN Huiming. INTERACTIONS AMONG COMPONENTS AND GELATION OF PVDF-BASED GEL ELECTROLYTES. [J]. Acta Polymerica Sinica (6):702-705(2001)
DOI：

WANG Guojie, PAN Huiming. INTERACTIONS AMONG COMPONENTS AND GELATION OF PVDF-BASED GEL ELECTROLYTES. [J]. Acta Polymerica Sinica (6):702-705(2001) DOI：

摘要

通过冷却聚偏氟乙烯 (PVDF)/丙烯碳酸酯(PC)或PVDF/PC/LiClO4的溶液

制备了数个聚合物凝胶 .实验表明

聚合物凝胶的凝胶化时间 (tgel)与凝胶温度、聚合物浓度有关

且强烈地依赖于体系中盐的浓度

因为盐会缩短体系的tgel.凝胶体系中LiClO4的存在提高了其凝胶熔融温度(Tgm)

LiClO4的含量越大

相应凝胶的Tgm 越高 .用DSC和落球法所测凝胶的Tgm 有较大的差别 .这说明凝胶中可能存在热稳定性好和热稳定性相对较差的两种不同结构部分 .FT-IR的研究结果表明

凝胶电解质的各组成 (LiClO4

PC和PVDF)间存在较强的相互作用 .对含盐和不含盐的两类凝胶体系的对比研究表明

两者不同的凝胶化现象和Tgm 归因于盐与聚合物或溶剂间的络合作用.

Abstract

Various poly(vinylidene fluoride) (PVDF)-based gels have been prepared by cooling solutions of PVDF in propylene carbonate (PC) or LiClO4／PC liquid electrolyte．The gelatlon time (tgel) is dependent on the temperature of gelation and polymer concentration

and strongly on salt concentration——salt helps to reduce the tgel LiClO4 in gels increases the gel melting temperature(Tgm)．The higher the LiClO4 concentration in the gels

the higher the Tgm．But there is considerable disparity between the results of Tgm of gels measured by DSA and by balldrop method

which suggests that there could be two parts with different structures：junction loci of polymer chain networks with weak thermal stability and other polymer crystals with rather good stability．The results of FT-IR indicate that there is strong interaction among LiClO4

PC and PVDF in gel electrolytes．The different gelation behavior and Tgm between the gels with and without salt can be attributed to the interactions between salt and polymer／solvent which change the structure and associations among the compositions in gels．

关键词

聚偏氟乙烯凝胶聚合物电解质热可逆凝胶化

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