Lactone aromatic derivative containing liquid crystal element, preparation method thereof, side chain type liquid crystal polymer and preparation method and application thereof

Abstract

The invention discloses a lactone aromatic derivative containing a liquid crystal element, a preparation method thereof, a side chain type liquid crystal polymer prepared by adopting the lactone aromatic derivative containing the liquid crystal element as a polymerization monomer, a preparation method of the side chain type liquid crystal polymer and application of the side chain type liquid crystal polymer. The lactone derivative containing the liquid crystal element is prepared by adopting an organic synthesis method firstly, and then the side chain type liquid crystal polymer is prepared byadopting a ring-opening polymerization method. Reaction steps are simple, the reaction conditions are mild, and the polymer with the specified molecular weight can be synthesized by controlling the feeding ratio of an initiator to the polymerization monomer. The prepared side chain type liquid crystal polymer meets the processing requirements of conventional methods such as injection molding, mould pressing, extrusion and coating, and can be used in the fields of display, optical recording, chromatographic separation, phase change energy storage, biological tissue recovery and the like.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal polymers, and relates to a mesogen-containing lactone aromatic derivative and its preparation process, and a side-chain type polymer prepared from the mesogen-containing lactone aromatic derivative as a polymerization monomer. Liquid crystal polymer and its preparation method and application. Background technique [0002] Liquid crystal polymers are polymers that can exist in a liquid crystal state under certain conditions. Compared with polymer compounds, they have molecular orientation and position sequences unique to liquid crystal phases; compared with small molecule liquid crystal compounds, they have high relative Molecular mass and characteristics of polymeric compounds. At present, the flexible main chains of side-chain liquid crystal polymers mainly include polyether, poly(meth)acrylate, and polysiloxane. Its synthesis method is usually the following two ways: [0003] 1) Synthe...

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Problems solved by technology

But at the same time, there are some problems in the above method: 1) the synthesis process of mesogen-containing monomers has many steps, many side reactions, and low yield, such as the polymerization of acrylate monomers due to conditions such as light and heat; 2 ) The polymer produced cannot be precisely controlled according to the design, such as a large deviation between the average molecular weight and the design, a wide molecular weight distribution, and incomplete reactions in the addition of hydrosilylation. The side chain intervals can only be -C-C-, -Si-O-, -C-C-C-O-, and it is impossible to synthesize side chain type liquid crystal polymers with different mesogen density in the main chain; 3) ring-opening polymerization / hydrosilylation The use of noble metal catalysts in the process is expensive

Due to the poor control of the polymerization process of traditional tin salts and the tendency to remain in the polymer, resulting in cytotoxicity and poor performance of the polymer, researchers have developed many new catalytic systems for ring-opening polymerization of lactones (such as the patent CN105348495A, CN105399932A and CN101107288A proposed bifunctional group ionic liquid, organic sulfonic acid, active carbon powder catalyst and Pseudomonas cepacia lipase, organic carboxylic acid, thiourea-amine bifunctional catalyst disclosed in the literature respectively)

[0018] At the same time, the researchers also investigated the structure research of the current lactone derivatives, and found that the lactone derivatives have a wide range of biological activities and good antibacterial, antiviral, tumor cell inhibition and other pharmacological effects, such as anti-inflammatory antibacterial and immune Stimulating andrographolide derivatives, antiarrhythmic biaryl seven-membered lactone and widely used macrolide derivatives, etc. Therefore, the research on the synthesis of lactone derivatives is currently mainly concentrated in the fields of biology and pharmaceuticals. The derivatives involved do not contain mesogens, and there is no precedent for the synthesis of side chain liquid crystal polymers directly

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