Electrochromic Polymer Side Chains for Viscosity and Film Thickness Control
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Solution Overview
Problem
Electrochromic polymers face challenges in achieving optimal viscosity and film thickness for device applications, as high viscosity leads to film cracks while low viscosity results in unstable morphology and reduced tensile strength.
Innovation Solution
An electrochromic polymer with polar side chains, specifically oligoethers like triethylene glycol (TEG), is developed, allowing for controlled viscosity and film thickness by adjusting the ratio of polar to alkyl side chains, enabling flexible processing and improved film characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the viscosity of the electrochromic polymer solution is increased to provide good tensile strength, then the film exhibits improved mechanical strength, but lateral shrinkage occurs and cracks form
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer by introducing polar side chains (oligoether groups) with controllable lengths and ratios. This modifies the intermolecular forces and chain flexibility, enabling precise control over solution viscosity and film morphology to achieve both strength and integrity
Solution Approach 2:
The patent creates a composite polymer structure by combining electrochromic units with polar oligoether side chains. This composite architecture allows the polymer to exhibit both the mechanical properties needed for strong films and the processing characteristics needed for crack-free morphology
2Productivity
If the viscosity of the electrochromic polymer solution is decreased to increase coating speed and efficiency, then the coating process becomes faster and more efficient, but the film exhibits lower tensile strength and unstable morphology
Solution Approach 1:
The patent modifies the polymer's physical parameters by adjusting the length and concentration of polar side chains, which directly controls solution viscosity. This enables optimization of coating speed while maintaining sufficient tensile strength through controlled polymer-solvent and polymer-polymer interactions
3Stability of the object's composition
If the viscosity of the electrochromic polymer solution is decreased to improve film morphology stability, then the film morphology becomes more stable, but tensile strength is reduced
Solution Approach 1:
The patent adjusts the chemical composition parameters by introducing polar side chains with specific lengths and ratios, which simultaneously improve morphology stability through enhanced chain flexibility and intermolecular interactions, while maintaining adequate tensile strength
Data Source
AI summary
An electrochromic polymer with polar side chains is disclosed. The viscosity of the electrochromic polymer is controllable by adjusting a ratio between polar side chains and alkyl side chains for forming the electrochromic polymer. The disclosed electrochromic polymer with polar side chains can be also made into a film with a controllable thickness by coating.