Hologram Recording Compound Using Linkers for Index-Solubility Balance
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Solution Overview
Problem
Existing optical materials face challenges in achieving a high refractive index, high transparency, easy polymerizability, chemical stability, and high solubility or compatibility with various solvents and resin raw materials, particularly due to the trade-off between molecular weight and solubility when introducing aromatic substituents.
Innovation Solution
A polyfunctional compound is developed with four or more fused aromatic ring substituents bonded via linking groups to phenoxy rings, allowing for increased molecular weight without reducing solubility, featuring a structure represented by Formula (1) that includes specific polymerizable groups and linking groups to enhance refractive index, transparency, and chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aromatic substituents are introduced to increase molecular weight and refractive index, then refractive index is improved, but solubility in various media and resin raw materials is reduced
Solution Approach 1:
The patent introduces an alkylene linker as an intermediary component between the aromatic rings and the polymerizable group. This linker acts as a mediator that connects the high refractive index aromatic structure to the polymerizable functionality while maintaining solubility. The alkylene linker provides flexible spacing and reduces the direct interaction between bulky aromatic groups and the polymerizable group, thereby resolving the contradiction between achieving high refractive index through aromatic substitution and maintaining solubility in resin raw materials.
Solution Approach 2:
The patent systematically varies parameters including the length of the alkylene linker (number of carbon atoms), the number and position of aromatic ring substituents, and the type of polymerizable group. By optimizing these parameters, the patent achieves a balance where the molecular weight and refractive index are increased through aromatic substitution while the solubility is maintained through appropriate linker design and polymerizable group selection.
2Reliability
If multiple resin raw materials are combined to satisfy multiple physical properties, then performance is improved, but solubility and compatibility between different resin raw materials become critical
Solution Approach 1:
The patent optimizes the molecular weight, functional group composition, and structural parameters of the polymerizable compound to ensure compatibility with multiple resin raw materials including polyurethane, epoxy, acrylic, and methacrylic resins. By carefully controlling the polymerizable group type and the alkylene linker structure, the patent achieves broad solubility and compatibility across different resin systems, enabling the composite material to exhibit performance exceeding that of single resin materials.
3Quantity of substance
If monofunctional compound is used, then solubility is maintained, but heat resistance is inferior compared to polyfunctional compounds
Solution Approach 1:
The patent systematically investigates the relationship between the functionality of the polymerizable compound (number of polymerizable groups per molecule) and the resulting material properties. By optimizing the functional group composition and molecular structure, the patent achieves a balance where the compound maintains good solubility while providing sufficient heat resistance through appropriate crosslinking density in the cured polymer network.
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 high refractive index, high transparency, easy polymerizability, and high solubility, enabling the production of optical materials with high diffraction efficiency and chemical stability, suitable for hologram recording media and optical components.
Implementation Method 1
polymerizable composition containing the compound... a polymer of the polymerizable composition
Data Source
AI summary
A compound of formula (1):wherein, A1 and A2 are a polymerizable group; n1 and n2 are an integer of 1 to 3; L1 is a single bond or an optionally branched (n1+1)-valent linking group; L2 is a single bond or an optionally branched (n2+1)-valent linking group; X is a single bond, a divalent organic group having 1 to 20 carbons, a sulfonyl group, or a divalent oxygen atom or sulfur atom; R1 and R2 are a fused aromatic ring group optionally having a substituent; and m1 and m2 are an integer of 2 to 4.