Color-Tunable and Stimulus-Responsive Luminescent Liquid Crystalline Polymers Fabricated by Hydrogen Bonding
Color-Tunable and Stimulus-Responsive Luminescent Liquid Crystalline Polymers Fabricated by Hydrogen Bonding
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通过氢键制备颜色可调和刺激响应的发光液晶聚合物
DOI：
10.1021/acsami.9b01476
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发表时间：
2019
影响因子：
9.5
通讯作者：
He-Lou Xie
中科院分区：
文献类型：
--
作者：
Lei Tao;Ming Li Li;Kai Peng Yang;Yan Guan;Ping Wang;Zhihao Shen;He-Lou Xie
发光液晶聚合物（LLCP）显示出广泛的应用潜力，例如液晶显示器和圆偏振发光。在这项工作中，我们采用不同于传统共价键方法的氢键策略来制造LLCP。首先，成功合成了氢键受体（4,4'-二丁氧基四苯乙烯）-1-吡啶（PTPEC4）和聚（2-乙烯基对苯二甲酸）（PPA）。然后，使用 PTPEC4 与 PPA 不同摩尔比 (x) 的混合物制备一系列 LLCP [表示为 PPA(PTPEC4)x]。所得的 LLCP 显示出近晶 A 相 (x≥ 0.8)、柱状向列相 (0.6 ≤x≤ 0.05) 和非晶态 (x= 0.025)，具体取决于 x 值。同时，所有聚合物都表现出典型的聚集诱导发射行为。更有趣的是，随着PTPEC4含量的变化，该系列LLCP显示出不同的颜色，即发射峰从510 nm（x= 1.0）红移到551 nm（x= 0.025）。此外，由于强质子酸对PTPEC4中吡啶N原子的可逆质子化作用，PPA(PTPEC4)x表现出可逆的颜色转变。这项工作提供了一种构建具有不同发射颜色和可逆颜色变换的 LLCP 的新方法。
Luminescent liquid crystalline polymers (LLCPs) show extensive application potentials, such as liquid crystal displays and circularly polarized luminescence. In this work, we employ a hydrogen-bonding strategy different from the traditional covalent-bonding method to fabricate LLCPs. First, the acceptor and donor of hydrogen bonding, (4,4′-dibutanoxy tetraphenylethylene)-1-pyridine (PTPEC4) and poly(2-vinyl terephthalic acid) (PPA), respectively, are successfully synthesized. Then, mixtures with different molar ratios (x’s) of PTPEC4to PPA are used to prepare a series of LLCPs [denoted as PPA(PTPEC4)x]. The resultant LLCPs show a smectic A phase (x≥ 0.8), a columnar nematic phase (0.6 ≤x≤ 0.05), and an amorphous state (x= 0.025), depending on thexvalue. Meanwhile, all polymers exhibit typical aggregation-induced emission behavior. More interestingly, with the variation of the PTPEC4content, the series of LLCPs show different colors, that is, the emission peak red shifts from 510 nm (x= 1.0) to 551 nm (x= 0.025). Furthermore, because of the reversible protonation effect of the N atom of pyridine in PTPEC4by the strong proton acid, PPA(PTPEC4)xshows reversible color transformation. This work provides a new method to construct LLCPs with different emission colors and reversible color transformation.