嵌段共聚物L64在1-丁基-3-甲基咪唑四氟硼酸盐离子液体中形成的层状液晶

doi:10.3866/PKU.WHXB201203262

物理化学学报 >> 2012, Vol. 28 >> Issue (06): 1411-1417.doi: 10.3866/PKU.WHXB201203262

嵌段共聚物L64在1-丁基-3-甲基咪唑四氟硼酸盐离子液体中形成的层状液晶

赵学艳¹, 曹宇容², 曹桂荣¹, 肖瑞杰¹

1. 防灾科技学院基础课教学部, 河北廊坊 065201;
2. 中国洗涤用品工业协会信息部, 北京 100044

收稿日期:2012-02-07 修回日期:2012-03-23 发布日期:2012-05-17
通讯作者: 赵学艳 E-mail:xyzhao@mail.sdu.edu.cn
基金资助:
中国地震局教师科研基金(20110123)和中央高校基本科研业务费创新项目团队计划(ZY20110103)资助

Lamellar Liquid Crystalline Phase Formed by Triblock Copolymer L64 in 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid

ZHAO Xue-Yan¹, CAO Yu-Rong², CAO Gui-Rong¹, XIAO Rui-Jie¹

1. Department of Fundamental Courses, Institute of Disaster Prevention, Langfang 065201, Hebei Province, P. R. China;
2. Department of Information, China Cleaning Industry Association, Beijing 100044, P. R. China

Received:2012-02-07 Revised:2012-03-23 Published:2012-05-17
Contact: ZHAO Xue-Yan E-mail:xyzhao@mail.sdu.edu.cn
Supported by:
The project was supported by the Teachers' Scientific Research Fund of China Earthquake Administration (20110123) and Fundamental Research Funds for the Central Universities for Innovative Research Team, China (ZY20110103).

摘要/Abstract

摘要： 利用偏光显微镜(POM)、小角X射线散射(SAXS)及傅里叶变换红外(FTIR)光谱技术研究了嵌段共聚物Pluronic L64 (PEO₁₃PPO₃₀PEO₁₃)(PEO: 聚氧乙烯; PPO: 聚氧丙烯)在室温离子液体1-丁基-3-甲基咪唑四氟硼酸盐[Bmim][BF₄]中的聚集行为. 绘制了L64/[Bmim][BF₄]体系的相图, 当L64浓度介于40%-65% (w, 质量分数)之间时, L64 可与[Bmim][BF₄]形成层状液晶. SAXS结果表明, 液晶层间距随L64 浓度的增加而降低. 温度对液晶微结构影响较大, 液晶层间距随温度的升高而增大, 极性头截面积则减小. 并且, 在一定温度范围内, 升温可使体系的有序性增强. 但是, 随温度的进一步升高, [Bmim][BF₄]与PEO链段之间的氢键被破坏, 双折射现象消失, 液晶有序性降低. 此外, 分析了层状液晶的形成机理, [Bmim][BF₄]与L64分子间的氢键作用力、静电作用力以及疏溶剂力是液晶形成的驱动力.

关键词: 离子液体, 嵌段共聚物, 层状液晶, 聚集行为, 形成机理

Abstract: The aggregation behavior of the triblock copolymer poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (L64, PEO₁₃PPO₃₀PEO₁₃) in the room-temperature ionic liquid 1-butyl-3- methylimidazolium tetrafluoroborate ([Bmim] [BF₄]) was investigated using polarized optical microscopy (POM), small-angle X-ray scattering (SAXS), and Fourier transform infrared (FTIR) spectroscopy. The phase diagram of the L64/[Bmim] [BF₄] system is described, where the micellar phase (L₁), a mixture of lamellar liquid crystalline (L_α) and L₁ phases, the L_α phase, a mixture of L_α and reverse micellar (L₂) phases, and the L₂ phase are sequentially mapped. Among these phases, the behavior of the L_α phase formed in the L64/[Bmim][BF₄] system in the L64 concentration region of 40%-65% (w, mass fraction) was focused on because it forms highly-ordered structures. The Maltese cross texture was found through POM characterization, and was typical for the L_α phase. The SAXS patterns further confirm the formation of the L_α phase. In addition, the lattice spacings of the L_α phase were obtained from the SAXS patterns. The effect of temperature on the microstructure of the L_α phase was also elucidated. As the temperature was increased, the lattice spacing and ordering of the L_α phase increased, while the interfacial area decreased for a certain temperature range. However, the birefringence of the L_α phase disappeared when the temperature reached a certain level, which was attributed to the breakdown of hydrogen bonding between [Bmim] [BF₄] and poly(ethylene oxide) chains, so the ordering of the L_α phase was decreased. The formation mechanism of the L_α phase is also discussed. Hydrogen bonding, electrostatic and solvophobic interactions are believed to be the main driving forces for the formation of L_α phase in the L64/[Bmim][BF₄] system.

Key words: Ionic liquid, Block copolymer, Lamellar liquid crystalline, Aggregation behavior, Formation mechanism

赵学艳, 曹宇容, 曹桂荣, 肖瑞杰. 嵌段共聚物L64在1-丁基-3-甲基咪唑四氟硼酸盐离子液体中形成的层状液晶[J]. 物理化学学报, 2012, 28(06), 1411-1417. doi: 10.3866/PKU.WHXB201203262

ZHAO Xue-Yan, CAO Yu-Rong, CAO Gui-Rong, XIAO Rui-Jie. Lamellar Liquid Crystalline Phase Formed by Triblock Copolymer L64 in 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid[J]. Acta Phys. -Chim. Sin. 2012, 28(06), 1411-1417. doi: 10.3866/PKU.WHXB201203262

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201203262

https://www.whxb.pku.edu.cn/CN/Y2012/V28/I06/1411

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嵌段共聚物L64在1-丁基-3-甲基咪唑四氟硼酸盐离子液体中形成的层状液晶

Lamellar Liquid Crystalline Phase Formed by Triblock Copolymer L64 in 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid

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