Cycloolefin Ring-Opened Copolymer for High-Breakdown Insulation
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Solution Overview
Problem
Conventional norbornene-based polymers do not adequately increase breakdown voltage for use as electrically insulating materials.
Innovation Solution
A cycloolefin ring-opened copolymer is developed with specific proportions of structural units derived from norbornene compounds containing and lacking heteroelement-containing hydrocarbon groups, optimizing the content between 0.01 mol% and 5.00 mol% for enhanced breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polymer having a methyl group at the 2-position of the polymer ring is used as an insulating material, then processability is improved, but heat resistance deteriorates due to low glass transition temperature
Solution Approach 1:
The patent applies local quality by introducing different substituents at specific positions on the polymer ring. Methyl groups are placed at the 2-position to improve processability, while other substituents (such as fluorinated groups or aromatic groups) are placed at different positions to maintain or enhance glass transition temperature, thus achieving both good processability and heat resistance through localized functional differentiation.
Solution Approach 2:
The patent employs composite materials by combining multiple types of cyclic olefin monomers with different substituents to form a copolymer. This composite approach allows the material to simultaneously exhibit the processability benefits of methyl-substituted units and the heat resistance of units with other substituents, resolving the contradiction between ease of manufacture and temperature resistance.
2Ease of manufacture
If conventional insulating materials are used, then manufacturing process is simple, but assembly precision deteriorates due to warpage caused by high molding temperature and long cycle time
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the polymer to achieve a balance between processability and dimensional stability. The specific substitution pattern on the cyclic olefin ring allows the material to be processed at lower temperatures with shorter cycle times while maintaining low warpage, thus improving assembly precision without significantly complicating the manufacturing process.
3Temperature
If insulating material with high heat resistance is required, then material selection is limited, but manufacturing cost increases due to use of specialized materials
Solution Approach 1:
The patent uses composite materials by creating a copolymer from different cyclic olefin monomers, where each monomer contributes specific properties. This approach achieves high heat resistance through the combined effect of different substituents on the polymer ring, while using readily available monomer building blocks that do not significantly increase manufacturing cost compared to conventional materials.
Solution Approach 2:
The patent applies local quality by strategically placing heat-resistant substituents at specific positions on the polymer ring structure. This localized functional enhancement achieves high heat resistance without requiring the entire material structure to be complex or expensive, thus controlling manufacturing costs while meeting heat resistance requirements.
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 copolymer achieves significantly higher breakdown voltage, enabling the formation of electrically insulating materials with superior performance.
Implementation Method 1
a copolymer obtained by ring-opening copolymerization of a cycloolefin represented by formula (1) and a cycloolefin represented by formula (2)
Implementation Method 2
it has been confirmed that a silane crosslinked structure is formed when a specific copolymer having a specific microstructure is subjected to crosslinking
Data Source
AI summary
A cycloolefin ring-opened copolymer includes a structural unit derived from a norbornene compound that includes a heteroelement-containing hydrocarbon group and a structural unit derived from a norbornene compound that includes a heteroelement-free hydrocarbon group. In this copolymer, the structural unit derived from the norbornene compound that includes the heteroelement-containing hydrocarbon group has a proportional content of not less than 0.01 mol% and not more than 15.00 mol% when all structural units included in the copolymer are taken to be 100 mol%.