Sulfur-Based Polymers via Inverse Vulcanization
Solution Overview
Problem
The development of sulfur-based polymers has been hindered by restricted choices of cross-linkers, harsh reaction conditions, and poor properties, limiting their applications and scalability, despite their potential to reduce reliance on petrochemical-derived synthetic polymers and utilize abundant elemental sulfur.
Innovation Solution
A process involving the reaction of elemental sulfur with organic cross-linking agents and catalysts, such as zinc dithiocarbamates, to produce sulfur-based polymers with improved properties, including increased glass transition temperatures and reduced H2S production, allowing for the creation of stable, high-sulfur-content materials suitable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional vulcanisation is used to crosslink polymers, then mechanical strength and stability are improved, but the process requires complex machinery and mechanical mixing
Solution Approach 1:
The patent inverts the conventional vulcanisation approach by using small organic molecules to crosslink polymeric sulfur instead of using sulfur to crosslink conventional polymers. This inversion allows the reaction to proceed in the liquid phase without complex mechanical mixing equipment, while still achieving crosslinked networks with improved mechanical properties
Solution Approach 2:
The patent utilizes liquid-phase reaction mechanics to enable crosslinking without mechanical mixing. The liquid state of the polymeric sulfur allows for homogeneous mixing and reaction through fluid dynamics rather than mechanical agitation, eliminating the need for complex machinery
2Ease of manufacture
If inverse vulcanisation is used to produce polymeric sulfur, then stable materials can be produced without complex equipment, but the choice of cross-linkers is restricted and reaction conditions are harsh
Solution Approach 1:
The patent changes the reaction parameters by introducing catalysts that enable inverse vulcanisation to proceed under milder conditions. This expands the range of suitable cross-linkers and improves the versatility of the process while maintaining ease of manufacture without complex equipment
Solution Approach 2:
The patent introduces catalysts as intermediaries to facilitate the crosslinking reaction between polymeric sulfur and organic molecules. These catalysts mediate the reaction to proceed under milder conditions, expanding the choice of available cross-linkers while maintaining the simplicity of the manufacturing process
3Reliability
If sulfur-based polymers are produced through inverse vulcanisation, then petrochemical reliance is reduced, but toxic by-products and poor polymer properties are generated
Solution Approach 1:
The patent converts the typically harmful polymeric sulfur into a beneficial material by using it as the polymer backbone in inverse vulcanisation. This approach utilizes what would otherwise be an unstable substance to create stable, sustainable materials with reduced petrochemical reliance and minimized toxic by-products
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 process enables the production of sulfur-based polymers with enhanced properties, such as increased glass transition temperatures and improved mercury uptake, facilitating their use in environmental remediation and other applications while reducing toxic by-product generation.
Implementation Method 1
reacting elemental sulfur with one or more organic crosslinking agents, in the presence of at least one catalyst
Implementation Method 2
reacting elemental sulfur with one or more organic crosslinking agents, wherein the organic crosslinking agent(s) comprises two or more carbon-carbon double bonds
Data Source
AI summary
The present invention relates to sulfur based polymers and a process of making sulfur based polymers. The invention also relates to sorbents comprising the sulfur-based polymers. The invention also relates to the use of such polymers and sorbents in metal remediation or extraction. The invention also relates to methods of removing heavy metals from fluids.