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研究报道刚性低聚物/聚合物向铁电向列相液晶的发展
作者:小柯机器人 发布时间:2021/10/21 16:11:38

华南理工大学黄明俊团队报道了刚性低聚物/聚合物向铁电向列相液晶的发展。相关研究成果发表在2021年10月17日出版的国际知名学术期刊《美国化学会杂志》。

新兴铁电向列相(NF)液晶是一种具有宏观电极化的三维有序液晶。超高介电常数、强非线性光信号和对电场的高灵敏度的结合使得NF材料有希望发展先进的液晶电光器件。以前,所有的研究都集中在具有有限长度(l)范围和偶极矩(μ)值的棒状小分子上。

该文中,研究人员通过精确合成,将芳香族棒状中间基扩展到低聚物/聚合物(单分散分子量分散的重复单元高达12),并将μ值增加到30德拜(D)以上。NF相的广泛存在远远超出了研究人员的预期,并且可以在所有低聚物/聚合物长度范围内观察到。值得注意的是,NF相经历了一个非平凡的演化路径,传统的非极性向列相被完全抑制,即NF相直接从各向同性液相成核。低聚物/聚合物棒的铁电堆积的发现不仅提供了将NF状态扩展到低聚物/聚合物的概念,而且还提供了一些以前被忽视的关于含氧苯甲酸酯基液晶聚合物材料的见解。

附:英文原文

Title: How Far Can We Push the Rigid Oligomers/Polymers toward Ferroelectric Nematic Liquid Crystals

Author: Jinxing Li, Runli Xia, Hao Xu, Jidan Yang, Xinxin Zhang, Junichi Kougo, Huanyu Lei, Shuqi Dai, Houbing Huang, Guangzu Zhang, Fangjie Cen, Yuanbin Jiang, Satoshi Aya, Mingjun Huang

Issue&Volume: October 17, 2021

Abstract: The emerging ferroelectric nematic (NF) liquid crystal is a novel 3D-ordered liquid exhibiting macroscopic electric polarization. The combination of the ultrahigh dielectric constant, strong nonlinear optical signal, and high sensitivity to the electric field makes NF materials promising for the development of advanced liquid crystal electroopic devices. Previously, all studies focused on the rod-shaped small molecules with limited length (l) range and dipole moment (μ) values. Here, through the precision synthesis, we extend the aromatic rod-shaped mesogen to oligomer/polymer (repeat unit up to 12 with monodisperse molecular-weight dispersion) and increase the μ value over 30 Debye (D). The NF phase has a widespread existence far beyond our expectation and could be observed in all the oligomer/polymer length range. Notably, the NF phase experiences a nontrivial evolution pathway with the traditional apolar nematic phase completely suppressed, i.e., the NF phase nucleates directly from the isotropic liquid phase. The discovery of thte ferroelectric packing of oligomer/polymer rods not only offers the concept of extending the NF state to oligomers/polymers but also provides some previously overlooked insights in oxybenzoate-based liquid crystal polymer materials.

DOI: 10.1021/jacs.1c09594

Source: https://pubs.acs.org/doi/10.1021/jacs.1c09594

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000