Color-Tunable and Stimulus-Responsive Luminescent Liquid Crystalline Polymers Fabricated by Hydrogen Bonding,ACS Applied Materials & Interfaces

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Color-Tunable and Stimulus-Responsive Luminescent Liquid Crystalline Polymers Fabricated by Hydrogen Bonding
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-04-03 00:00:00 , DOI: 10.1021/acsami.9b01476
Lei Tao ₁ , Ming-Li Li ₁ , Kai-Peng Yang ₁ , Yan Guan ₂ , Ping Wang ₁ , Zhihao Shen ₂ , He-Lou Xie _{1,

3}

Affiliation

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 PTPEC₄ to 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 the x value. Meanwhile, all polymers exhibit typical aggregation-induced emission behavior. More interestingly, with the variation of the PTPEC₄ content, 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 PTPEC₄ by the strong proton acid, PPA(PTPEC₄)_x shows reversible color transformation. This work provides a new method to construct LLCPs with different emission colors and reversible color transformation.

中文翻译：

通过氢键键合制备颜色可调和刺激响应的发光液晶聚合物

发光液晶聚合物（LLCP）具有广泛的应用潜力，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合方法的氢键合策略来制造LLCP。首先，分别成功地合成了氢键的受体和供体，分别为（4,4'-二丁氧基四苯基乙烯）-1-吡啶（PTPEC ₄）和聚（2-乙烯基对苯二甲酸）。然后，使用具有不同PTPEC ₄与PPA摩尔比（x 's）的混合物来制备一系列LLCP [表示为PPA（PTPEC ₄）_x ]。产生的LLCP显示近晶A相（x≥0.8），柱状向列相（0.6≤ X ≤0.05），和无定形状态（X = 0.025），这取决于X的值。同时，所有聚合物均表现出典型的聚集诱导的发射行为。更有趣的是，随着PTPEC ₄含量的变化，LLPC系列显示出不同的颜色，也就是说，发射峰红色从510 nm（x = 1.0）变为551 nm（x = 0.025）。此外，由于强质子酸PTPEC ₄中吡啶N原子的可逆质子化作用，PPA（PTPEC ₄）_x显示可逆的颜色转换。这项工作提供了一种构建具有不同发射颜色和可逆颜色转换的LLCP的新方法。

更新日期：2019-04-03

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