133641-66-4Relevant academic research and scientific papers
Full-spectrum selective reflection annular side chain liquid crystal oligomer film and preparation method thereof
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, (2021/08/06)
The invention discloses a full-spectrum selective reflection annular side chain liquid crystal oligomer film and a preparation method thereof. The preparation method comprises the following steps: respectively carrying out graft copolymerization on a chiral liquid crystal monomer and an achiral rod-like monomer or two chiral liquid crystal monomers and annular polymethyl hydrogen-containing siloxane to construct the full-spectrum selective reflection annular side chain liquid crystal oligomer film, the structural formula is shown as a formula I. The cyclic side chain liquid crystal oligomer can realize full-spectrum selective reflection in the heating process; at room temperature, the annular side chain liquid crystal oligomer film can realize full-spectrum selective reflection along with the change of an incident angle. The cyclic side chain liquid crystal oligomer prepared by the method has dual characteristics that dynamic full-spectrum selective reflection changes along with temperature and incident angle, and has a wide application prospect in the optical field, the preparation process is safe to operate, and reaction conditions are mild.
Cooperative and Independent Effect of Modular Functionalization on Mesomorphic Performances and Microphase Separation of Well-Designed Liquid Crystalline Diblock Copolymers
Lei, Lan,Han, Li,Ma, Hongwei,Zhang, Ruixue,Huang, Shuai,Shen, Heyu,Yang, Lincan,Li, Chao,Zhang, Songbo,Bai, Hongyuan,Ma, Qingchi,Li, Yang
supporting information, p. 11199 - 11208 (2020/07/30)
Liquid crystalline block copolymers (LCBCPs) are promising for developing functional materials owing to an assembly of better functionalities. Taking advantage of differences in reactivity between alkynyl and vinyl over temperature during hydrosilylation, a series of LCBCPs with modular functionalization of the block copolymers (BCPs) are reported by independently and site-selectively attaching azobenzene moieties containing alkynyl (LC1) and Si-H (LC2) terminals into well-designed poly(styrene)-block-polybutadienes (PS-b-PBs) and poly(4-vinylphenyldimethylsilane)-block-polybutadienes (PVPDMS-b-PBs) produced from living anionic polymerization (LAP). By the principle of modular functionalization, it is demonstrated that mono-functionalized (PVPDMS-g-LC1)-b-PB and PS-b-(PB-g-LC2) not only maintain independence but also have cooperative contributions to bi-functionalized (PVPDMS-g-LC1)-b-(PB-g-LC2) in terms of mesomorphic performances and microphase separation, which is evident from differential scanning calorimetry (DSC) and polarized optical morphologies (POM) and identified by powder X-ray diffractions. With the application of the new principle of modular functionalization, local-crosslinked liquid crystalline networks (LCNs) with controlled functionality are successfully synthesized, which show well-controlled phase behaviors over molecular compositions.
New liquid-crystalline elastomers: 1. Synthesis, structure, and phase behavior of a series of mesogenic crosslinking agents containing reactive bifunctional groups
Xu, Xiao-Xu,Hong, Zhe,Liu, Fei
scheme or table, p. 52 - 62 (2011/09/15)
The synthesis of eight mesogenic crosslinking agents (1c-8c) containing reactive bifunctional groups is described. The chemical structures were characterized by Fourier transform infrared (FTIR) and 1H nuclear magnetic resonance (NMR) spectra. The mesomorphism was investigated by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). The compounds 1c, 2c, 3c, 5c, 6c, and 8c showed an enantiotropic nematic phase. In addition, 5c exhibited a smectic A (SmA) phase on cooling; 4c exhibited a smectic C (SmC) phase, a SmA phase, and a nematic phase and a monotropic a smectic B (SmB) phase on cooling. 7c revealed an SmA phase and a nematic phase and a monotropic SmC phase on cooling. Copyright Taylor & Francis Group, LLC.
