Polymerizable Liquid Crystal Material Thermal Stability
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Solution Overview
Problem
Current polymerizable liquid crystal materials suffer from low thermal durability and UV stability, leading to degradation in optical properties when exposed to increased temperatures, and require additional additives for improved performance.
Innovation Solution
A polymerizable LC material comprising di- or multireactive mesogenic compounds and compounds of formula TRI, which enhances thermal and UV stability, allowing for the production of highly transparent, durable polymer films suitable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymerizable liquid crystal materials are used, then the film can be produced with uniform orientation, but the thermal durability and UV stability are insufficient leading to degradation of optical properties
Solution Approach 1:
The patent employs composite materials by combining di- or multireactive mesogenic compounds with specific compounds of formula TRI that contain antioxidant moieties. This composite approach integrates the liquid crystal functionality with thermal and UV stability properties within a single material system, eliminating the need for separate additive packages and resolving the contradiction between reliability and complexity.
Solution Approach 2:
The compound of formula TRI serves multiple functions simultaneously: it acts as a liquid crystal monomer, provides antioxidant protection against thermo-oxidative degradation, and contributes UV stability. This self-service capability allows the material to protect itself without requiring external additives, thereby improving thermal durability while maintaining simple material composition.
2Reliability
If antioxidant additives are added to improve thermal stability, then thermo-oxidative degradation is reduced, but the material requires additional additives increasing complexity
Solution Approach 1:
The patent merges the liquid crystal monomer function with the antioxidant function by incorporating antioxidant moieties directly into the compound of formula TRI. This combination consolidates multiple functions into a single material component, improving thermal stability while reducing the number of additives required.
Solution Approach 2:
The compound of formula TRI exhibits multi-functionality, serving as both a liquid crystal monomer and an antioxidant protector. This universal approach allows a single material to perform multiple roles, thereby improving thermal stability without increasing material composition complexity.
3Reliability
If the polymerization degree is increased to improve thermal durability, then thermo-oxidative degradation is reduced, but the material synthesis becomes more complex
Solution Approach 1:
The patent incorporates antioxidant moieties and polymerizable groups into the liquid crystal monomer structure during the synthesis stage. This preliminary action ensures that the monomer is pre-equipped to form high polymerization degree polymers with inherent thermal stability, avoiding complex post-synthesis modifications and simplifying the overall manufacturing process.
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 proposed material achieves improved thermal and UV stability, maintaining optical properties and transparency, even at high temperatures, without the need for additional additives, making it suitable for diverse applications including optical, electro-optical, and decorative uses.
Implementation Method 1
polymerizing the mixture
Implementation Method 2
liquid crystal materials... the liquid crystal molecules are oriented substantially parallel to the layer
Data Source
AI summary
The invention relates to a polymerisable LC material comprising one or more di- or multireactive mesogenic compounds and one or more compounds of formula (TRI), wherein the individual radicals have one of the meaning as given in the claims. Furthermore, the present invention relates also to a method for its preparation, a polymer film with improved thermal durability and UV stability obtainable from the corresponding polymerisable LC material, to a method of preparation of such polymer film, and to the use of such polymer film and said polymerisable LC material for optical, electro- optical, decorative or security devices.