Self-Healing Polyimide Composite via Cyclodextrin Inclusion

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional metal coatings lack self-repairing capabilities and are prone to mechanical damage, leading to instability and reduced protection against corrosion, which affects the performance and lifespan of equipment.

Innovation Solution

A polyimide composite is developed, comprising a polycondensate of aromatic diamine and dianhydride with SiO2 grafted β-cyclodextrin and adamantane, enabling self-repair through inclusion reactions and cyclization, forming a stable compound with SiO2-(β-CD-Ada)x/PI structure, which enhances mechanical properties and resistance to ultraviolet radiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional coatings are used for metal protection, then the coating provides initial barrier protection, but the coating is easily damaged by mechanical forces and microcracks, losing protection stability

Engineering Contradiction:

Improveprotection stabilityVSAvoidmechanical damage resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The coating is designed with self-repairing functionality where cyclodextrin molecules embedded in the polymer matrix automatically repair microcracks and mechanical damage through host-guest inclusion reactions. When damage occurs, the cyclodextrin-adamantane complexes dynamically reorganize to seal cracks and restore barrier protection without external intervention, making the coating self-healing and maintaining long-term protection stability.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention creates a composite coating system combining polymer matrix with cyclodextrin-adamantane inclusion complexes. This composite structure integrates the mechanical properties of the polymer with the self-repairing capability of the supramolecular inclusion complexes, achieving both strength and automatic repair functionality that conventional single-material coatings cannot provide.

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If conventional coatings are used, then the coating provides initial corrosion barrier, but the coating lacks self-repairing capability and protection sustainability is weak

Engineering Contradiction:

Improveprotection sustainabilityVSAvoidself-repairing capability

Core Design Contradiction:

Duration of action of stationary objectVSAdaptability or versatility

Solution Approach 1:

The coating incorporates cyclodextrin molecules that automatically detect and repair damage through host-guest chemistry. When microcracks or mechanical damage occur, the cyclodextrin-adamantane inclusion complexes dynamically reorganize to seal defects and restore the barrier function, providing sustained protection over time without requiring external maintenance or repair interventions.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The coating utilizes the dynamic nature of host-guest inclusion reactions, where the binding equilibrium between cyclodextrin and adamantane can shift in response to damage. This parameter change capability allows the coating to adapt its molecular structure and repair itself when damaged, extending the duration of effective protection.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If smart self-repairing materials are developed, then the material can self-repair when damaged, but there are no reports of polyimide-based self-repairing materials indicating development complexity

Engineering Contradiction:

Improveself-repairing functionalityVSAvoidmaterial structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Instead of making the entire polyimide structure complex, the invention introduces cyclodextrin-adamantane inclusion complexes as localized functional units within the polymer matrix. This local quality approach concentrates the self-repairing functionality in specific regions (the inclusion complexes) while maintaining the simplicity of the bulk polyimide structure, reducing overall complexity while achieving smart material functionality.

Inventive Principle:

Principle #3Local quality

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 polyimide composite exhibits reversible repair capabilities and improved mechanical properties, maintaining protection against external damage and environmental factors, demonstrating effective self-repairing and anti-aging performance.

Implementation Method 1

the assembly body is made of SiO2 grafted β-cyclodextrin and reacted with adamantane by an inclusion reaction

Methodology Applied

Scientific EffectInclusion reaction:

Implementation Method 2

the polyimide resin is a polycondensate of an aromatic diamine and an aromatic dianhydride

Methodology Applied

Scientific EffectPolycondensation reaction:

Implementation Method 3

performing a graft reaction between SiO2 and β-cyclodextrin

Methodology Applied

Scientific EffectGraft reaction:

Data Source

PatentUS11667759B2Polyimide composite, a method of preparing thereof, and application thereof

Publication Date: 2023.06.06 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A polyimide composite, a method of preparing thereof, and an application thereof are provided. A general structure of the polyimide composite is: SiO2-(β-CD-Ada)x/PI, and x is 3 to 5. The polyimide composite has the functions of self-repairing and anti-aging.