Electro-switchable Polymer Film with Ionic Liquid Encapsulation
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Solution Overview
Problem
Ionic electroactive polymers (EAPs) are often dependent on ambient conditions such as temperature and humidity, leading to drying out and loss of functionality over time, necessitating systems that reduce this dependency.
Innovation Solution
Incorporating ionic liquids as an electrolyte solution in a polymer matrix, forming a solid body system that prevents drying out and maintains functionality, combined with electrode pairs and structuring particles to switch the polymer film's surface from a smooth to a structured state using electrical switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ionic electroactive polymers are used as actuators, then the polymer can be electrically switched to change surface structure, but the polymer dries out and loses functionality over time due to dependency on ambient conditions
Solution Approach 1:
The patent encapsulates the ionic electroactive polymer between a first and second substrate forming a closed cavity, preventing the electrolyte solution from evaporating. This encapsulation structure maintains the polymer's functionality by isolating it from ambient conditions while allowing electrical switching to change surface structure.
Solution Approach 2:
The patent creates a protected environment within the closed cavity formed by substrates, preventing the ionic electroactive polymer from drying out. This inert environment approach maintains the polymer's electroactive properties by eliminating exposure to ambient air that would cause electrolyte loss.
2Reliability
If a closed cavity system is used to prevent drying out, then reliability is improved, but device complexity increases
Solution Approach 1:
The substrates serving as both structural support and encapsulation barriers perform multiple functions. The first and second substrates simultaneously provide mechanical support for the polymer and create the sealed cavity that prevents electrolyte loss, reducing the need for additional protective components.
Solution Approach 2:
The patent combines the structural support function and the encapsulation function into a single integrated system. The substrates that support the electroactive polymer also form the sealed cavity, merging multiple functions into unified components that reduce overall device complexity.
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 system allows for reversible and repeatable surface structuring, enabling applications in haptics, optics, and fluid flow control, with adjustable properties suitable for various commercial applications.
Implementation Method 1
a first and/or second surface side of the polymer film arrangement can be converted actively from a smooth state (state before applying an electrical voltage) into a structured state (state after applying an electrical voltage) by electrical switching of an electroactive polymer
Implementation Method 2
Incorporating ionic liquids as an electrolyte solution in a polymer matrix, forming a solid body system that prevents drying out and maintains functionality
Data Source
AI summary
The invention relates to an electro-switchable polymer film assembly having a first and a second surface side, comprising at least one pair of electrodes (3, 4) and a polymer matrix (2), wherein structuring particles (5) can be embedded in the polymer matrix and the polymer matrix or the structuring particles consist of an electro-active polymer, wherein furthermore, the first and/or the second surface sides can be transferred from a plane condition into a structured condition by electric switching of the electro-active polymer.