Reactive side chain type liquid crystal copolymer

A technology of side-chain liquid crystals and copolymers, applied in the field of liquid crystal epoxy polymers, can solve the problems of restricted crystal units at both ends, unfavorable liquid crystal unit reorientation and rearrangement, and liquid crystal unit dispersion, etc. Controllable oxygen functionality, improved interfacial compatibility, and high mobility

Inactive Publication Date: 2012-06-06
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: small molecular liquid crystals or main chain type polymer liquid crystals introduce mesogens into composite materials, resulting in 1. The two ends of crystals are limited, which is beneficial to the orientation of mesogens and the position of liquid crystals Fixed, it is not conducive to the reorientation and rearrangement of mesogens (self-healing, memory function); 2. When the content of mesogens added is relatively small (necessary for cost control), if it is not pre-formed before blending Side-chain type liquid crystal polymers, the mesogens are relatively dispersed, it is difficult to self-assemble into liquid crystal micro-domains and cannot achieve the modification effect

Method used

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  • Reactive side chain type liquid crystal copolymer
  • Reactive side chain type liquid crystal copolymer
  • Reactive side chain type liquid crystal copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Monomer MBPHMA (7.3694 g, 2 × 10 -2 mole), monomer GMA (0.7108 g, 5×10 -3 mole) and initiator AIBN (0.0082 g, 2.5×10 -5 ) was added to the three-necked flask in turn, and the nitrogen was repeatedly pumped three times. Under the protection of nitrogen, 50 ml of solvent THF was added, and the mixed system was rapidly magnetically stirred until the mixed system was clear and colorless. The diluted solution was dropped into methanol with slow magnetic stirring, a white precipitate was precipitated, filtered, and vacuum-dried at 60°C for 6 hours to obtain 7.12 g of a white solid, a reactive side-chain liquid crystal copolymer. Its structural formula is:

[0032]

[0033] Through detection and analysis:

[0034] figure 1 is the NMR spectrum of PMBPHMA-co-PGMA, combined with the general molecular formula of the polymer (the hydrogen atom indicated by the lowercase symbol on it, and figure 1 The peaks indicated by the lowercase letter symbols in the one-to-one corres...

Embodiment 2

[0039] The reaction solvent and diluent were chloroform, and the rest were the same as in Example 1.

Embodiment 3

[0041] The initiator adopts BPO (dibenzoyl peroxide), and the reaction temperature is 80° C., and the rest are the same as in Example 1.

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Abstract

The invention discloses a reactive side chain type liquid crystal copolymer, wherein at least epoxy monomer units and mesogenic group monomer units are hung on side chains. The copolymer has the following advantages: 1. the content of liquid crystal elements and the epoxy functionality are controllable; 2. only single end of the liquid crystal elements bound on the main chain of the polymer is limited and the liquid crystal units have higher moveability, relatively high-density area is formed around the main chain, thus facilitating to form a liquid crystal micro-zone with the desired size through self-assembly; and 3. the interfacial compatibility of the liquid crystal micro-zone and the resin matrix is improved owning to the chemical bonding of reactive epoxy groups. Therefore, the reactive side chain type liquid crystal copolymer is expected to be used as the matrix resin of modified material with low content of liquid crystal elements or other functional materials.

Description

technical field [0001] The present invention relates to a liquid crystal epoxy polymer. Background technique [0002] Liquid crystal polymer materials have excellent properties of high modulus, high strength and high temperature resistance, but the cost is too high to use as structural materials. This has prompted people to adopt a convenient method that can combine the excellent properties of various polymer materials - blending. The use of liquid crystals for blending modification is very characteristic: 1. While the flexible spacer chains of thermotropic liquid crystal polymers improve the ductility of the polymer material, the rigid mesogenic regions of the polymer are dispersed in the polymer in the form of rigidity or microfibers. In the matrix, not only can riveting the end of the crack to hinder its further development, but also after the crack is generated, it can be oriented perpendicular to the direction of the crack section due to the force, bridge the two sides...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/30C08F220/32C09K19/38
Inventor 张海良钟冠群叶文赵才贤谢鹤楼
Owner XIANGTAN UNIV
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