Polymerizable Liquid Crystal Compound for High-Temperature Quarter-Wave Plates
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Solution Overview
Problem
Existing reverse dispersion liquid crystal materials for quarter-wave plates have low heat stability and solubility issues, making them unsuitable for high-temperature applications like car displays, and struggle with preparing films due to low stiffness and stability.
Innovation Solution
A polymerizable liquid crystal compound with a benzylphenanthrene or benzylphenanthridine core and heteroatom linkers is developed, enhancing core stiffness and solubility, allowing for superior reverse dispersion and film preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If existing reverse dispersion liquid crystal materials are used for quarter-wave plates, then the optical element can be manufactured, but the heat stability is low and solubility issues occur making them unsuitable for high-temperature applications
Solution Approach 1:
The patent modifies the molecular structure parameters of liquid crystal compounds by introducing specific heteroatom linkers (O, S, or NR7) and polymerizable functional groups (P1, P2, P3) at defined positions in the molecular skeleton. This structural parameter change enables the compound to achieve both high heat stability and improved solubility, resolving the contradiction between these two properties in reverse dispersion liquid crystal materials
Solution Approach 2:
The patent creates a composite molecular structure combining a rigid core (benzene ring or cyclohexane group with specific heteroatoms) and polymerizable functional groups. This composite structure allows the material to exhibit both thermal stability from the rigid core and enhanced solubility and processability from the functional groups, making it suitable for high-temperature applications
2Ease of manufacture
If existing liquid crystal materials are used, then film preparation can be attempted, but low stiffness and stability make film preparation difficult
Solution Approach 1:
The patent incorporates polymerizable functional groups (epoxy, oxetane, aziridinyl, maleimide, or (meth)acryloyl groups) into the liquid crystal compound structure before film formation. This preliminary incorporation of reactive groups enables subsequent in-situ polymerization during or after film preparation, providing the necessary stiffness and mechanical stability for successful film manufacturing
Solution Approach 2:
The patent changes the physical and chemical parameters of the liquid crystal compound by introducing polymerizable functional groups with specific molecular weights and structures. This parameter modification enhances the stiffness and stability of the material, enabling proper film formation while maintaining ease of manufacture through controlled polymerization
3Reliability
If liquid crystal compounds are coated and polymerized to create optically anisotropic bodies, then the optical element can be formed, but the compounds require specific solubility and high temperature durability properties that are hard to achieve simultaneously
Solution Approach 1:
The patent applies local quality by placing specific heteroatoms (O, S, or NR7) at defined positions (Y) and polymerizable functional groups (P1, P2, P3) at specific locations in the molecular structure. This localized structural modification allows different parts of the molecule to contribute different properties: the core provides thermal stability while the functional groups provide solubility and polymerizability, achieving both high temperature durability and ease of manufacture
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 compound achieves excellent high-temperature durability and reverse dispersion performance, enabling the creation of high-performance quarter-wave plates with improved stability and solubility for use in display devices.
Implementation Method 1
polymerizing the result by ultraviolet rays or heat
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.