Hydrogel Volume Control via Ionic Polymer Cross-Linking
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Solution Overview
Problem
Existing stimulus-responsive hydrogels struggle to autonomously turn on and off functions in response to transient stimuli, often requiring external stimuli to activate or deactivate functions.
Innovation Solution
A method involving the use of an ionic polymer that interacts with a hydrogel containing a site with decomposition activity and a cross-linkable functional group, allowing for the cross-linking and subsequent decomposition of the ionic polymer to control the hydrogel's volume changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If external stimuli are provided to turn on and off functions in stimulus-responsive hydrogels, then the hydrogel can respond to stimuli, but the system complexity increases and autonomous control is lost
Solution Approach 1:
The hydrogel system performs self-service by autonomously turning functions on and off through intrinsic biochemical reactions. The enzyme embedded in the hydrogel decomposes the ionic polymer crosslinker in response to substrate presence, causing spontaneous volume expansion and function activation, without requiring external control inputs.
Solution Approach 2:
The ionic polymer serves as an intermediary component that mediates between the enzyme's decomposition activity and the hydrogel's volume response. The enzyme decomposes the ionic polymer crosslinker, which in turn triggers the volume change and functional response, creating an autonomous control mechanism.
2Volume of moving object
If ionic polymer cross-linking is formed to reduce hydrogel volume, then volume control is achieved, but the hydrogel structure becomes more rigid and less responsive
Solution Approach 1:
The hydrogel structure is designed to be dynamic rather than static. The ionic polymer crosslinks provide temporary stability that can be rapidly reversed through enzymatic decomposition. This dynamic crosslinking mechanism allows the hydrogel to transition between contracted and expanded states, maintaining both volume control and structural responsiveness.
Solution Approach 2:
The system utilizes parameter changes in the crosslinking density through enzymatic decomposition of the ionic polymer. As the enzyme decomposes the ionic polymer crosslinker, the crosslinking density decreases, triggering volume expansion. This parameter change mechanism enables reversible volume control while maintaining structural integrity.
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
This method enables the hydrogel to spontaneously and dynamically change its volume by using the ionic polymer as a fuel, allowing for autonomous and controlled volume increases and decreases.
Implementation Method 1
a cross-linkable functional group that is capable of cross-linking with the ionic polymer through electrostatic interaction
Implementation Method 2
decomposing the ionic polymer cross-linking with the hydrogel by using the site having decomposition activity
Data Source
AI summary
The present invention relates to a method for changing a hydrogel volume, the method including a step A of bringing an ionic polymer into contact with a hydrogel, which has a site having decomposition activity for the ionic polymer and a cross-linkable functional group that is capable of cross-linking with the ionic polymer through electrostatic interaction, to allow the cross-linkable functional group to cross-link with the ionic polymer, and reducing a volume of the hydrogel; and a step B of decomposing the ionic polymer cross-linking with the hydrogel by using the site having decomposition activity and discharging at least part of a decomposition product of the ionic polymer from the hydrogel to increase the hydrogel volume.