Photoreactive Polymer Orientation Layers for Liquid Crystals
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Solution Overview
Problem
There is a need for advanced photoreactive polymer materials that can efficiently orient liquid crystals and facilitate manufacturing processes, such as roll-to-roll processing, while being compatible with various substrates and providing good orientation properties.
Innovation Solution
The development of novel photoreactive polymer materials comprising specific repeating units, including acrylate and methacrylate monomers, with spacer units and linking groups, which can be polymerized to form homopolymers or copolymers, allowing for efficient alignment of liquid crystals when exposed to aligning light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photoreactive compounds are used as orientation layer for liquid crystals, then liquid crystal orientation is achieved, but manufacturing efficiency is low and roll-to-roll processing is not feasible
Solution Approach 1:
The patent modifies the chemical structure of photoreactive compounds by incorporating specific monomer units (acrylate, methacrylate, vinyl ether, vinyl ester) with defined functional groups and spacer units. These parameter changes in molecular structure enable the materials to cure efficiently under UV irradiation at practical manufacturing speeds, making roll-to-roll processing feasible while maintaining good liquid crystal orientation properties
Solution Approach 2:
The invention creates composite polymer materials by copolymerizing multiple monomer types containing different functional groups (photoreactive groups, spacer units, linking groups). This composite approach combines the advantages of different monomer structures to achieve both rapid UV curing for high productivity and effective liquid crystal alignment, resolving the contradiction between manufacturing efficiency and ease of manufacture
2Manufacturing precision
If advanced photoreactive polymer materials are developed for efficient liquid crystal orientation, then orientation quality improves, but material complexity increases
Solution Approach 1:
The patent segments the molecular structure into distinct functional modules: photoreactive groups (acrylate, methacrylate, vinyl ether, vinyl ester), spacer units (S1, S2, S3 with specific chain lengths), and linking groups (Y1, Y2 with defined chemical bonds). This segmentation allows systematic optimization of each module's function while maintaining overall material manageability and reducing synthesis complexity through modular design
Solution Approach 2:
The invention applies local quality by assigning specific functional characteristics to specific parts of the polymer chain. The photoreactive groups are positioned to ensure efficient UV absorption and curing, spacer units are designed with specific lengths (C4-C24 alkylene) to control molecular spacing and orientation, and linking groups are selected to provide appropriate flexibility and connectivity. This localized optimization achieves high orientation quality without requiring complex overall material structures
3Speed
If photoreactive materials are optimized for fast liquid crystal orientation, then orientation speed increases, but energy requirements may increase
Solution Approach 1:
The patent utilizes periodic UV irradiation to initiate photopolymerization of the photoreactive groups. The periodic activation of photoreactive monomers (acrylate, methacrylate, vinyl ether, vinyl ester) through UV light exposure enables rapid orientation of liquid crystals within practical timeframes while controlling energy input to match manufacturing requirements, achieving fast orientation without excessive energy consumption
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
These polymer materials enable fast and efficient orientation of liquid crystals with high contrast and low energy requirements, suitable for various substrates, including glass and flexible materials, and are applicable in roll-to-roll processes, enhancing the production of optical and electro-optical elements.
Implementation Method 1
irradiating the polymer material which comprises repeating units of formula (I) with aligning light
Data Source
AI summary
The present invention relates to novel photoactive polymer materials and their use as orienting layer for liquid crystals, which are used for the production of non-structured and structured optical elements or electro-optical elements and multi-layer systems.