Polymerizable Liquid Crystal Compound for High-Temperature Durability
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Solution Overview
Problem
Existing reverse dispersion liquid crystal materials for quarter-wave plates face challenges with low heat stability and solubility issues, making them unsuitable for high-temperature applications such as car display devices.
Innovation Solution
A polymerizable liquid crystal compound with a diphenylquinoxaline or dibenzophenazine core is developed, offering high core stiffness and structural stability, which enhances solubility and high-temperature durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing reverse dispersion liquid crystal materials are used for quarter-wave plates, then the device can be manufactured, but the heat stability is poor and solubility is insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of liquid crystal compounds by introducing diphenylquinoxaline or dibenzophenazine cores with specific substituents (R1-R6 groups) to simultaneously improve heat stability and solubility. The chemical structure parameters are optimized to achieve both high-temperature durability and adequate solubility for film preparation.
Solution Approach 2:
The patent creates composite liquid crystal compounds by combining rigid aromatic cores (diphenylquinoxaline or dibenzophenazine) with flexible substituent groups (R1-R6). This composite molecular structure integrates the heat stability of rigid aromatic systems with the solubility-enhancing effects of flexible substituents, resolving the contradiction between these two properties.
2Reliability
If existing liquid crystal materials are used, then the basic function is achieved, but high-temperature durability is insufficient for car display devices
Solution Approach 1:
The patent employs curved or rigid aromatic ring structures (diphenylquinoxaline and dibenzophenazine cores) to create molecular frameworks that resist thermal deformation. These rigid aromatic skeletons provide high-temperature durability by maintaining molecular integrity at elevated temperatures, enabling operation in car display devices exposed to high temperatures.
Solution Approach 2:
The patent changes the thermal parameters of liquid crystal materials by incorporating high-boiling-point aromatic cores and optimizing substituent groups (R1-R6) to enhance thermal stability. This parameter modification raises the operating temperature range, making the materials suitable for high-temperature environments like car displays.
3Ease of manufacture
If polymerizable functional groups are introduced to improve processing, then film preparation becomes easier, but the core structural stability may be compromised
Solution Approach 1:
The patent segments the molecular structure into two independent functional parts: a rigid aromatic core (diphenylquinoxaline or dibenzophenazine) that maintains structural stability, and polymerizable functional groups (R1-R6) that enable film preparation. This segmentation allows each part to fulfill its specific function without compromising the other, resolving the contradiction between processing ease and structural stability.
Solution Approach 2:
The patent uses substituent groups (R1-R6) as intermediary elements that bridge the rigid aromatic core and the polymerizable functional groups. These intermediary groups maintain the structural integrity of the aromatic core while providing the necessary reactivity for polymerization, enabling both structural stability and ease of film preparation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The new compound achieves excellent solubility and high-temperature durability, enabling the production of reverse dispersion liquid crystal materials with improved performance and ease of film preparation.
Implementation Method 1
polymerizing the result by ultraviolet rays or heat
Implementation Method 2
a vector sum of the two components varies depending on double refraction and thickness of the phase retarder
Data Source
AI summary
A polymerizable liquid crystal compound represented by Chemical Formula 1, a liquid crystal composition for an optical element comprising the same, a polymer polymerized from the same, an optically anisotropic body comprising a cured material or polymerized reactant of the liquid crystal composition or the polymer, and an optical element for a display device comprising the optical anisotropic body are disclosed herein.