Hydrochromic Polydiacetylene Patch Adhesion and Humidity Stability
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Solution Overview
Problem
Conventional hydrochromic polydiacetylene thin films are prone to detachment from base materials like glass or PET films, require large amounts of material for large-area fabrication, and are sensitive to humidity, leading to potential loss of sensor function.
Innovation Solution
A hydrochromic polymer patch comprising a polymer matrix with polydiacetylene units and ionic functional groups, combined with a hydrophilic polymer and optionally a plasticizer, which is formed by self-assembly and photopolymerization to reduce sensitivity to humidity and prevent detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional base materials (glass, PET film, OHP film) are used for preparing hydrochromic polydiacetylene thin film, then the film can be fabricated, but the film detaches or peels off easily
Solution Approach 1:
The patent uses a composite structure consisting of a base material, an intermediate layer, and a polydiacetylene complex layer. The intermediate layer acts as an adhesive interface between the base material and the polydiacetylene complex, preventing detachment while maintaining fabrication simplicity. This composite approach resolves the contradiction by introducing a specialized intermediate component that enhances adhesion without complicating the overall manufacturing process.
2Area of stationary object
If a large amount of hydrochromic polydiacetylene complex is used for large-area thin film fabrication, then the film can be prepared, but the film becomes non-uniform
Solution Approach 1:
The intermediate layer serves as a mediator that facilitates uniform distribution of the polydiacetylene complex across large areas. By providing a controlled interface between the base material and the active complex layer, it enables large-area fabrication while maintaining film uniformity, thus resolving the contradiction between area size and manufacturing precision.
3Duration of action of stationary object
If the fabricated thin film is stored after fabrication, then it can be preserved, but it sensitively reacts with moisture in the atmosphere causing loss of sensor function
Solution Approach 1:
The intermediate layer acts as a protective barrier or shell that shields the polydiacetylene complex from atmospheric moisture during storage. This protective layer allows long-term storage while preventing moisture-induced degradation of sensor function, thus resolving the contradiction between storage duration and reliability.
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 polymer patch effectively inhibits polydiacetylene separation from the base material and reduces humidity sensitivity, maintaining sensor functionality and enabling applications such as sweat pore mapping and moisture detection.
Implementation Method 1
Polydiacetylene, which is a polymer of diacetylene monomers, is a conjugated polymer prepared by photopolymerization such as irradiation with ultraviolet rays or gamma rays when diacetylene monomers are arranged through self-assembly
Implementation Method 2
The wavelength of polydiacetylene shifts to a maximum absorption wavelength of about 540 nm and the color thereof is changed by changes in the external environment (heat, solvent, pH, force, molecular recognition, etc.)
Data Source
AI summary
A hydrochromic polydiacetylene polymer patch and a method of manufacturing the same are provided. The hydrochromic polymer patch comprises a polymer matrix; and polydiacetylene present in the polymer matrix. The polydiacetylene has an ionic functional group in the repeating unit thereof. The ionic functional group is R−M+ or R+X−. R− is a carboxylate anion, M+ is an alkali metal cation, and R+ is a quaternary ammonium group, and X− is F−, Cl−, Br−, I−, PF6−, BF4−, bis(trifluoromethane)sulfonimide (Tf2N−), trifluoromethanesulfonate (TfO−), SCN−, or CH3COO−.