Polyimide Resin Composition with Heterocyclic Side Chains
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Solution Overview
Problem
Current polyimide resins face challenges in achieving a balance between high heat resistance, bending resistance, and abrasion resistance, as improving one property often compromises the others, such as increased heat resistance leading to reduced flexibility and mechanical strength.
Innovation Solution
A polyimide resin composition is developed by incorporating a polymer with a heterocyclic ring at a side chain, specifically polyvinylpyrrolidone or polyvinylpyridine, in a controlled amount, along with specific structural units and repeating units, to enhance both bending and abrasion resistance while maintaining heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the molecular skeleton is made rigid to improve heat resistance, then heat resistance is improved, but flexibility decreases and bending resistance becomes poor
Solution Approach 1:
The patent segments the molecular structure into two distinct parts: a rigid main chain skeleton that provides heat resistance, and flexible side chains containing heterocyclic rings that provide flexibility. This segmentation allows each part to independently contribute its desired property without compromising the other.
Solution Approach 2:
The patent applies local quality by introducing flexible heterocyclic ring structures specifically at the side chain positions while maintaining the rigid backbone structure. This localized modification enables the resin to exhibit both high heat resistance from the rigid backbone and good flexibility from the flexible side chains.
2Strength
If the molecular skeleton is made rigid to enhance abrasion resistance, then abrasion resistance is enhanced, but mobility of the molecule decreases and flexibility decreases
Solution Approach 1:
The patent divides the molecular structure into a rigid main chain for abrasion resistance and flexible side chains for flexibility, allowing both properties to coexist without mutual interference.
Solution Approach 2:
The patent introduces flexible heterocyclic structures locally at the side chains while maintaining the rigid backbone, enabling the material to exhibit both high abrasion resistance and good flexibility simultaneously.
3Strength
If a flexible skeleton is introduced to improve elongation properties, then elongation properties are improved, but mechanical properties including heat resistance and elastic modulus remarkably decrease
Solution Approach 1:
The patent segments the molecular structure into a rigid main chain that maintains heat resistance and elastic modulus, and flexible side chains that provide elongation properties, allowing independent optimization of each property.
Solution Approach 2:
The patent introduces flexible heterocyclic structures specifically at the side chain positions to improve elongation while the rigid backbone maintains heat resistance and mechanical strength.
Data Source
AI summary
A resin composition for insulating coating material, comprises: a polyimide resin and/or a precursor thereof; and a polymer having a heterocyclic ring at a side chain, wherein the content of the polymer having a heterocyclic ring at a side chain is 0.1 to 7 parts by weight relative to 100 parts by weight of the polyimide resin and/or the precursor thereof. By adding a prescribed amount of the polymer having a heterocyclic ring at a side chain, there can be obtained a resin composition for insulating coating material still maintaining heat resistance and together having excellent bending resistance.