Polymerizable Compound for Optical Film Wavelength Dependence
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Solution Overview
Problem
Existing optical films exhibit significant wavelength dependence, limiting their ability to maintain constant polarization across a wide wavelength range, and they often require high temperatures for processing, which can be problematic for achieving optimal optical properties and film formation.
Innovation Solution
A polymerizable compound with specific chemical structures, represented by Chemical Formulas (1-1) and (1-2), is used to create a polymerizable composition that exhibits a liquid crystal phase at low temperatures and good solubility in organic solvents, allowing for the formation of an optical film with reverse-wavelength dispersibility and improved optical properties across a wide wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing polymerizable compounds are used to form optical films, then the films can be manufactured, but they exhibit significant wavelength dependence that limits constant polarization conversion across wide wavelength ranges
Solution Approach 1:
The patent modifies the molecular structure of polymerizable compounds by introducing specific chemical groups (isocyanate, cyanate, carboxyl, hydroxyl, amine) with different polarities and electronic properties. These parameter changes in molecular structure enable the polymer to exhibit reverse-wavelength dispersibility, achieving constant polarization conversion across wide wavelength ranges from 400-780 nm.
Solution Approach 2:
The patent creates composite polymer structures by combining multiple functional groups and molecular components in specific configurations. The composite nature of the polymerizable compound, integrating rigid aromatic rings with flexible alkyl chains and various functional groups, enables simultaneous achievement of low processing temperature and wide wavelength range optical performance.
2Ease of manufacture
If high temperatures are used for processing optical films, then film formation can be achieved, but optimal optical properties and processing conditions become difficult to maintain
Solution Approach 1:
The patent changes the thermal parameters of the polymerizable compound by introducing functional groups with low melting points and high mobility, such as hydroxyl, amine, and carboxyl groups. These groups reduce the glass transition temperature and melting point, enabling film formation at low temperatures (below 100°C) while maintaining optimal optical properties.
Solution Approach 2:
The patent utilizes phase transition behavior of the polymerizable compound, which exhibits liquid crystal phase at low temperatures. This phase transition property allows the material to be processed at low temperatures while forming uniform films with optimal optical properties, avoiding the need for high temperature processing.
3Reliability
If polymerizable compounds with specific optical properties are used, then reverse-wavelength dispersibility can be achieved, but the compounds may have poor solubility in organic solvents
Solution Approach 1:
The patent modifies the solubility parameters of the polymerizable compound by introducing polar functional groups (hydroxyl, carboxyl, amine, isocyanate) that enhance intermolecular interactions with organic solvents. These parameter changes in molecular polarity and hydrogen bonding capability significantly improve solubility in common organic solvents like toluene, ethyl acetate, and acetonitrile.
Solution Approach 2:
The patent applies local quality modification by introducing specific functional groups at particular positions within the molecular structure. The combination of rigid aromatic cores with flexible alkyl chains and polar functional groups creates local regions of different properties, enabling both optimal optical performance and good solubility simultaneously.
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 resulting optical film demonstrates superior reverse-wavelength dispersibility and reduced wavelength dependence, enabling constant polarization conversion over a broad wavelength range while allowing for lower processing temperatures, thus enhancing the film's optical performance and processing conditions.
Implementation Method 1
a polymerizable compound containing a group represented by Chemical Formula (1-1) or Chemical Formula (1-2) below and a polymerizable group... which exhibits an excellent liquid crystal phase at a relatively low temperature
Implementation Method 2
applying the solution on a supporting substrate, and then performing polymerization
Data Source
AI summary
Proposed are a polymerizable compound, a polymerizable composition, and an optical film using the same, which can exhibit superior optical properties in a wide wavelength range by reducing wavelength dependence or exhibiting reverse-wavelength dispersibility.