Thiosulfate Polymer Metal Sequestration via Photochemical Decomposition
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Solution Overview
Problem
There is no efficient photochemical method known for decomposing Bunte salts, which limits the ability to pattern thin films using Bunte salt polymers for various applications, including metal sequestration in predetermined patterns.
Innovation Solution
A method involving photochemical electron transfer is used to decompose non-crosslinked thiosulfate polymers, creating crosslinked polymeric layers with disulfide groups in predetermined patterns, allowing for metal ion incorporation and subsequent electroless plating to form metal coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal decomposition or electrochemical decomposition methods are used to decompose Bunte salts, then metal sequestration can be achieved, but the process complexity increases and manufacturing precision decreases
Solution Approach 1:
The patent replaces thermal decomposition and electrochemical decomposition methods with photochemical decomposition. Specifically, Bunte salt polymers are exposed to UV light to generate thiols in situ, which then sequester metal ions. This substitution eliminates the need for complex thermal processing equipment or electrochemical cells, while achieving reliable metal sequestration through a simpler photopolymerization process.
2Manufacturing precision
If photochemical decomposition method is used to decompose Bunte salts, then manufacturing precision and resolution are improved, but the method complexity increases
Solution Approach 1:
The patent employs a self-service mechanism where the Bunte salt polymer itself serves as both the structural matrix and the photoactive component. Upon UV exposure, the Bunte salt groups within the polymer decompose to generate thiols that remain trapped in the polymer network, automatically creating the metal-sequestering pattern without requiring external thiol application or complex monitoring systems.
Solution Approach 2:
The patent incorporates Bunte salt groups into the polymer matrix during the polymerization stage, before the metal sequestration step. This preliminary incorporation ensures that when UV exposure occurs, the thiols are generated exactly where needed in the polymer network, enabling precise patterning and eliminating the need for subsequent complex processing steps.
3Quantity of substance
If conventional metal deposition methods are used, then metal coatings can be formed, but cost and process complexity increase
Solution Approach 1:
The patent creates a self-service system where the Bunte salt polymer matrix automatically generates the necessary thiol groups upon UV exposure, and these thiols directly sequester metal ions from solution to form the metal coating. This eliminates the need for expensive external thiol applications, complex deposition equipment, or multiple processing steps, significantly reducing manufacturing cost while forming complete metal coatings.
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 precise patterning and efficient metal sequestration with improved resolution and permanence, facilitating the use of Bunte salt polymers in applications like electroless metal plating and surface energy modulation.
Implementation Method 1
photochemically reacting a polymeric layer comprising a non-crosslinked thiosulfate polymer and a photosensitizer to provide a crosslinked polymeric layer
Implementation Method 2
decompose non-crosslinked thiosulfate polymers, creating crosslinked polymeric layers with disulfide groups
Implementation Method 3
subsequent electroless plating to form metal coatings
Data Source
AI summary
A thiosulfate polymer composition includes an electron-accepting photosensitizer component, either as a separate compound or as an attachment to the thiosulfate polymer. The thiosulfate polymer composition can be applied to various articles, or used to form a predetermined polymeric pattern after photothermal reaction to form crosslinked disulfide bonds, removing non-crosslinked polymer, and reaction with a disulfide-reactive material. Such thiosulfate polymer compositions can also be used to sequestering metals.