Cyclic Olefin Copolymer Crosslinking for Thermal Resistance
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Solution Overview
Problem
Current cyclic olefin copolymers face challenges in achieving high thermal resistance, mechanical strength, and dielectric stability while maintaining transparency and moldability, particularly in applications like electronic parts and liquid crystal displays, where inorganic fillers compromise toughness and dielectric characteristics.
Innovation Solution
A cyclic olefin copolymer with a specific molar ratio of repeating units derived from olefins, cyclic non-conjugated dienes, and cyclic olefins, optimized to contain 19-36 mol% cyclic non-conjugated diene units, which allows for excellent dielectric stability and thermal resistance, along with improved mechanical and gas barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If inorganic fillers are added to improve thermal resistance, then thermal resistance is improved, but toughness, dielectric characteristics, and transparency are greatly decreased
Solution Approach 1:
The invention changes the chemical composition parameters of the copolymer by controlling the molar ratio of cyclic non-conjugated diene units (19-36 mol%) and introducing crosslinkable groups, thereby achieving thermal resistance improvement through molecular structure modification rather than adding inorganic fillers
Solution Approach 2:
The invention creates a composite polymer system by combining cyclic olefin copolymer with crosslinkable groups and crosslinking agents, forming a crosslinked network structure that provides thermal resistance without the negative effects of inorganic fillers
2Temperature
If addition polymerization is performed using only cyclic olefin monomers to improve thermal resistance, then thermal resistance is improved, but the glass transition temperature becomes excessively high making melt processing and molding industrially difficult
Solution Approach 1:
The invention adjusts the compositional parameters by incorporating 19-36 mol% cyclic non-conjugated diene units alongside cyclic olefin units, optimizing the glass transition temperature to enable both thermal resistance and melt processability
Solution Approach 2:
The invention introduces localized crosslinkable groups at specific positions in the polymer chain (through cyclic non-conjugated diene units) rather than uniform crosslinking throughout, allowing controlled crosslinking that maintains processability while achieving thermal resistance
3Strength
If crosslinking is performed using sulfur or organic peroxide to improve thermal resistance and mechanical strength, then thermal resistance and mechanical strength are improved, but dielectric characteristics deteriorate over time
Solution Approach 1:
The invention uses readily available crosslinkable groups (vinyl, allyl, or epoxide groups) that can be crosslinked with simple agents, replacing complex crosslinking systems that cause dielectric deterioration
Solution Approach 2:
The invention changes the chemical nature of crosslinking by using crosslinkable groups directly incorporated into the polymer backbone (cyclic non-conjugated diene units) rather than external crosslinking agents, achieving stable dielectric characteristics through molecular structure design
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 optimized copolymer achieves balanced physical properties, including stability, thermal resistance, and moldability, preventing deterioration in dielectric characteristics and maintaining transparency, making it suitable for advanced applications.
Implementation Method 1
crosslinking the cyclic olefin copolymer by various methods such as crosslinking using sulfur, crosslinking using an organic peroxide, crosslinking using electron beams, and crosslinking using radiation
Data Source
AI summary
The cyclic olefin copolymer of the present invention contains (A) a repeating unit derived from one or more kinds of olefins represented by the following General Formula (I), (B) a repeating unit derived from a cyclic non-conjugated diene represented by the following General Formula (III), and (C) a repeating unit derived from one or more kinds of cyclic olefins represented by the following General Formula (V), wherein when a total mole number of the repeating units is regarded as 100 mol %, the (B) repeating unit derived from a cyclic non-conjugated diene is contained in an amount of 19 mol % to 36 mol %.