芳烃-氟代芳烃和氢键作用调控的树枝状分子自组装及其液晶性质

王章远; 吴惠娴; 倪博; 马玉国

doi:10.11777/j.issn1000-3304.2017.16287

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芳烃-氟代芳烃和氢键作用调控的树枝状分子自组装及其液晶性质

研究论文 | 更新时间：2021-05-18

- 芳烃-氟代芳烃和氢键作用调控的树枝状分子自组装及其液晶性质
- Self-assembly and Liquid Crystalline Phase of Dendrimer Mediated by Arene-Perfluoroarene and Hydrogen Bonding Interactions
- 高分子学报 2017年第2期页码：329-333
- 作者机构：
  
  北京大学化学与分子工程学院北京 100871
- 作者简介：
  
  马玉国, E-mail: ygma@pku.edu.cn Ma Yu-guo, E-mail: ygma@pku.edu.cn
- 基金信息：
  
  国家自然科学基金(21074004)
- DOI：10.11777/j.issn1000-3304.2017.16287
  中图分类号：
- 纸质出版日期：2017-2-20，
  
  收稿日期：2016-9-17，
  
  修回日期：2016-10-13，
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王章远, 吴惠娴, 倪博, 马玉国. 芳烃-氟代芳烃和氢键作用调控的树枝状分子自组装及其液晶性质[J]. 高分子学报, 2017,(2):329-333.

Zhang-yuan Wang, Hui-xian Wu, Ben-bo Ni, Yu-guo Ma. Self-assembly and Liquid Crystalline Phase of Dendrimer Mediated by Arene-Perfluoroarene and Hydrogen Bonding Interactions[J]. Acta Polymerica Sinica, 2017,(2):329-333.
王章远, 吴惠娴, 倪博, 马玉国. 芳烃-氟代芳烃和氢键作用调控的树枝状分子自组装及其液晶性质[J]. 高分子学报, 2017,(2):329-333. DOI： 10.11777/j.issn1000-3304.2017.16287.

Zhang-yuan Wang, Hui-xian Wu, Ben-bo Ni, Yu-guo Ma. Self-assembly and Liquid Crystalline Phase of Dendrimer Mediated by Arene-Perfluoroarene and Hydrogen Bonding Interactions[J]. Acta Polymerica Sinica, 2017,(2):329-333. DOI： 10.11777/j.issn1000-3304.2017.16287.

摘要

通过收敛法合成了母核为亚胺键连接的芳环与氟代芳环，外围为3

5-三（正十二烷氧基）苯基亚甲基的第一代树枝状亚胺分子，并对其热致液晶行为和聚集体结构进行了研究.示差扫描量热和热台偏光光学显微镜研究表明该亚胺分子在93℃到118℃的温度范围内为具有双折射的液晶相.X-射线衍射结果表明该亚胺分子的液晶相为斜柱状结构（

=4.90 nm

=3.51 nm

=110°）.芳环-氟代芳环的面对面交替堆积和氢键驱动亚胺分子形成了柱状聚集体，分子外围的柔性十二烷氧基链的无序伸展，与母核聚集体发生微相分离，促使了亚胺分子斜柱状液晶相的形成.

Abstract

Imine

with a phenylene and a tetrafluorophenylene units tethered by an imine bond was synthesized

and its self-assembly and thermotropic liquid crystalline behaviour were studied. Imine

showed a high thermal stability with only 5% mass loss occurred at 346℃ as revealed by thermal gravimetric analysis (TGA). The heating process of differential scanning calorimetry (DSC) analysis revealed two endothermic peaks at 93 and 118℃

which were attributed to the transition from the crystalline phase into the liquid crystalline phase and the transition from liquid crystalline phase into the isotropic phase

respectively. Meanwhile

similar phase transition behaviors were observed in the cooling process

with phase transition temperatures at 97 and 84℃

respectively. In addition

in the polarized optical microscopy (POM) analysis

imine

melt and turned birefringent at 110℃

then it transformed into an isotropic liquid at 118℃. Upon slowly cooling at a rate of 1 K/min

an occurrence of a liquid crystal birefringence was detected again at 106℃. Thus

the results obtained with POM agreed well with DSC thermograms

both characterizations indicated imine

formed liquid crystalline phase from 93℃ to 118℃. Wide-angle X-ray diffraction (WAXD) revealed an oblique columnar lattice of imine

in the liquid crystal state

with

=4.90 nm

=3.51 nm and

=110°. Two-dimensional X-ray diffraction (2D XRD) patterns of oriented sample of imine

further confirmed its oblique columnar liquid crystalline phase. The results revealed that arene-perfluoroarene face-to-face stacking and amide-amide hydrogen bonding interactions were responsible for the formation of columnar aggregation of imine

. Furthermore

disordered dodecyloxyl chains on both ends of the molecule were proposed to interpenetrate with one another

which formed microphase separation in the aggregation

and contributed to the formation of long-range ordered columnar liquid crystalline phase.

关键词

树枝状分子液晶芳烃-氟代芳烃相互作用氢键

Keywords

DendrimerArene-perfluoroarene interactionHydrogen bondingLiquid crystal

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