Phase Behavior and Phase Structure of Polymerized Ionic Liquid Crystals with Different Alkyl Tail Length Based on "Jacketing" Effect

Yan Jiao-jiao; Fan Yao-jian; Tao Lei; Xie He-lou; Zhang Hai-liang

doi:10.11777/j.issn1000-3304.2017.17088

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Phase Behavior and Phase Structure of Polymerized Ionic Liquid Crystals with Different Alkyl Tail Length Based on "Jacketing" Effect

Research Article | 更新时间：2021-01-26

- Phase Behavior and Phase Structure of Polymerized Ionic Liquid Crystals with Different Alkyl Tail Length Based on "Jacketing" Effect
  增强出版
- Acta Polymerica Sinica Issue 10, Pages: 1616-1623(2017)
- 作者机构：
  
  1.湘潭大学化学学院湘潭 411105
  2.湖南工学院材料与化学工程学院衡阳 421002
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17088
  CLC：
- Published：20 October 2017，
  
  Received：17 April 2017，
  
  Revised：28 April 2017，
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Yan Jiao-jiao, Fan Yao-jian, Tao Lei, Xie He-lou, Zhang Hai-liang. Phase Behavior and Phase Structure of Polymerized Ionic Liquid Crystals with Different Alkyl Tail Length Based on "Jacketing" Effect. [J]. Acta Polymerica Sinica (10):1616-1623(2017)
DOI：

Yan Jiao-jiao, Fan Yao-jian, Tao Lei, Xie He-lou, Zhang Hai-liang. Phase Behavior and Phase Structure of Polymerized Ionic Liquid Crystals with Different Alkyl Tail Length Based on "Jacketing" Effect. [J]. Acta Polymerica Sinica (10):1616-1623(2017) DOI： 10.11777/j.issn1000-3304.2017.17088.

摘要

考察了一系列基于“甲壳”效应的离子液晶高分子poly（2，5-bis{[6-（4-butoxy-4'-imidazolium phenyl）

-alkyl]oxy carbonyl}styrene bis（fluoroborate）salts）P

-6

-BF

（

=4，8，12，16）的相行为和相结构.热重分析结果表明，该系列聚合物的热分解温度都在320℃以上，说明其均具有优异的热稳定性能.示差扫描量热仪结果表明，P

4-6

-BF

和P

8-6

-BF

仅表现出一个玻璃化转变，随着尾链的增长，P

12-6

-BF

和P

16-6

-BF

具有一个结晶熔融峰.偏光显微镜、一维广角X衍射、二维广角X衍射结果表明，该系列聚合物均形成稳定的近晶A相结构，并且随着烷烃尾链的增长，层间距增加、近晶结构内部分子堆积形式有所改变.

Abstract

We synthesized a series of ILCPs contained imidazolium based on “Jacketing” effect

via

radical polymerization

poly(2

5-bis{[6-(4-butoxy-4′-imidazolium phenyl)

-alkyl] oxy carbonyl} styrene bis (fluoroborate) salts) (denoted as P

-6

-BF

represents the number of carbon in the alkyl tails

= 4

16). Especially

we mainly focused on their phase behaviors and the supra-molecular structures. Firstly

thermogravimetric analysis (TGA) showed that the decomposition temperature of ILCPs exceeded 320 ºC

revealing the excellent thermal stability of the samples. Differential scanning calorimetry (DSC) results showed that the samples with relatively short alkyl tail (P

-6

-BF

= 4

8) had only glass transition temperature (

)

while the samples with relatively long alkyl tail (P

-6

-BF

= 12

16) also exhibited a melting peak

indicating that increasing the tail length resulted in the crystallization of the alkyl. Polarized light microscopy (PLM) results showed that the liquid crystalline (LC) texture always existed prior to the decomposition

indicating that this kind of ILCPs showed a broad LC temperature. One-(1D) and two-dimensional (2D) wide-angle X-ray diffraction (WAXD) results indicated that P

-6

-BF

(

= 4

16) formed SmA phase

wherein the side-chain mesogens were perpendicular to the main-chain. Combining the experimental data and the calculated result

we could conclude that the side-chain molecular packing adopted an interpenetrating mode. Furthermore

reconstructed relative electron density map by fast Fourier transform algorithm (FFT) was used to confirm the above results. The FFT result revealed that the increase of alkyl tail length would increase not only the

-spacing of the layer but also affect the interaction between the ions and the side chains

resulting in different molecular packing within SmA phase. It is evident that molecular packing of the ordered structure of ILCPs can be changed by tuning the length of the alkyl tail

which is beneficial to pave a way for the applications of ILCPs.

关键词

离子液晶高分子“甲壳”效应咪唑盐相行为相结构

Keywords

Ionic liquid crystal polymers (ILCPs)"Jacketing" effectImidazoliumPhase behaviorPhase structure

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