Branched Copolymer for Optical Devices Resolving Heat Resistance Trade-offs
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Solution Overview
Problem
Conventional aromatic polyimide resins face limitations in mechanical properties, adhesiveness, insulation, and patterning due to their rigid structure, which affects their suitability for optical devices, and existing modifications to improve heat resistance compromise these properties.
Innovation Solution
A branched copolymer with a branched amide functional group and a polyimide block is developed, allowing for low-temperature curing, enhanced adhesion, mechanical properties, and improved insulation and patterning capabilities through a specific branch structure and crosslinking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a rigid chain structure is used to achieve heat resistance and dimensional stability, then thermal stability is improved, but mechanical properties and adhesiveness deteriorate
Solution Approach 1:
The patent creates a composite structure by combining polyimide blocks (providing heat resistance) with amide functional groups (providing mechanical strength and adhesiveness). The copolymer contains both polyimide units and amide units in a specific ratio, achieving synergistic effects that resolve the contradiction between thermal stability and mechanical properties
Solution Approach 2:
The patent introduces amide functional groups at specific locations within the polymer chain (as side chains or terminal groups) rather than uniformly throughout. This localized modification allows the main chain to maintain its rigid heat-resistant structure while specific regions provide enhanced mechanical properties and adhesiveness
2Illumination intensity
If electron withdrawing groups are introduced to achieve colorless transparency, then optical properties are improved, but heat resistance deteriorates
Solution Approach 1:
The patent introduces electron-withdrawing groups (such as trifluoromethyl groups) only at specific positions on the aromatic rings of the polyimide structure, rather than throughout the entire molecule. This localized introduction suppresses CTC formation for optical clarity while minimizing the impact on the overall rigid chain structure, thereby preserving heat resistance
Solution Approach 2:
The patent combines polyimide units with amide units in a copolymer structure. The amide units provide a different mechanism for achieving optical transparency that does not compromise heat resistance, complementing the polyimide units and resolving the contradiction between optical and thermal properties
3Illumination intensity
If bending structures are introduced to reduce CTC formation, then optical properties are improved, but heat resistance and mechanical properties deteriorate
Solution Approach 1:
The patent introduces bending structures (such as ether linkages or sulfone groups) only at specific locations within the polymer chain rather than throughout. This localized bending reduces CTC formation and improves optical transparency while maintaining the overall rigid chain structure necessary for heat resistance
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 branched copolymer achieves excellent mechanical properties, durability, and insulation characteristics, enabling its application in various optical devices with improved adhesion and patterning performance.
Implementation Method 1
a branched copolymer which can be cured at a low temperature, has excellent adhesive strength and mechanical properties
Data Source
AI summary
The present invention relates to a branched copolymer having a polyimide polymer block bonded to each terminal of a branched polyamide functional group, and a photosensitive resin composition including the same, a photosensitive resin film, and an optical device.