Electrochromic Element Cyanoethylated Polymer Viscosity
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Solution Overview
Problem
Solution-phase electrochromic elements experience a decrease in viscosity with increasing temperature, leading to self-bleaching reactions and a reduction in maximum optical density, which is disadvantageous in terms of power consumption and durability, and existing solutions like adding acrylic resin do not effectively prevent these issues.
Innovation Solution
Incorporating a cyanoethylated polymer into the electrochromic layer to maintain high viscosity and ionic conductivity over a wide temperature range, balancing these properties to suppress self-bleaching reactions and maintain maximum optical density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electrochromic element is exposed to heat from imaging element and circuit board, then the ambient temperature rises to 100°C or more, but the viscosity of electrochromic solution decreases leading to self-bleaching reactions and reduced optical density
Solution Approach 1:
The patent changes the chemical composition parameters of the electrochromic solution by introducing a cyanoethylated polymer with specific molecular weight (10,000-100,000) and cyanoethyl substitution degree (30-70%). This parameter modification enables the solution to maintain stable viscosity and prevent self-bleaching reactions even at temperatures of 100°C or higher, directly resolving the temperature-optical density stability contradiction.
Solution Approach 2:
The patent creates a composite electrochromic solution by combining the cyanoethylated polymer with electrochromic compounds (such as viologens, phenazines, or indigotindisulfonate) and electrolytes. This composite formulation synergistically provides both the electrochromic functionality and the thermal stability, allowing the system to maintain high optical density under high temperature conditions without sacrificing electrochromic performance.
2Temperature
If acrylic resin is added to increase viscosity and heat resistance, then heat resistance improves, but the patent indicates existing solutions do not effectively prevent self-bleaching reactions
Solution Approach 1:
The patent replaces conventional acrylic resin additives with a specifically designed cyanoethylated polymer that provides superior and more durable performance. The cyanoethylated polymer maintains its viscosity-stabilizing properties at high temperatures where acrylic resin fails, effectively preventing self-bleaching reactions that occur with conventional additives.
Solution Approach 2:
The patent modifies the molecular structure parameters by using a cyanoethylated polymer with specific characteristics (molecular weight 10,000-100,000, cyanoethyl substitution degree 30-70%) instead of conventional acrylic resin. These parameter changes enable the additive to effectively suppress self-bleaching reactions at high temperatures, overcoming the limitations of existing acrylic resin-based solutions.
3Stability of the object's composition
If viscosity is increased by adding acrylic material, then segregation due to natural convection is reduced, but the patent indicates this does not effectively prevent self-bleaching reactions
Solution Approach 1:
The patent changes the chemical parameters by introducing a cyanoethylated polymer with specific molecular weight and substitution degree, which provides both adequate viscosity for preventing segregation and additional chemical stability to suppress self-bleaching reactions. This dual-function parameter modification overcomes the limitation of conventional acrylic materials that only address segregation but not self-bleaching.
Solution Approach 2:
The patent develops a composite electrochromic solution where the cyanoethylated polymer serves multiple functions: maintaining composition stability by preventing segregation through appropriate viscosity, and simultaneously suppressing self-bleaching reactions through its chemical structure. This multi-functional composite approach resolves both stability issues that single additives cannot address.
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 electrochromic element operates stably over a wider temperature range with suppressed self-bleaching reactions and reduced power consumption, maintaining high optical density without the drawbacks of increased current or reduced response speed.
Implementation Method 1
Incorporating a cyanoethylated polymer into the electrochromic layer to maintain high viscosity and ionic conductivity over a wide temperature range
Implementation Method 2
At least either of these materials has electrochromicity, that is, the function of forming an absorption band in at least a portion of the visible light region by an electrochemical redox reaction thereof
Implementation Method 3
the oxidation reaction of the anodic material and the reduction reaction of the cathodic material occur simultaneously at the corresponding electrodes
Data Source
AI summary
An electrochromic element includes a pair of electrodes and an electrochromic layer disposed between the pair of electrodes. The electrochromic layer contains an electrochromic material, a solvent, and a cyanoethylated polymer.