Polyarylene Sulfide Synthesis Without Halogen Byproducts
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Solution Overview
Problem
Conventional methods for producing polyarylene sulfide (PAS) result in low yield and are plagued by unrecyclable halogen-containing byproducts, making purification difficult and contributing to environmental pollution.
Innovation Solution
A method involving the reaction of a monomer with sulfonic acid, diphenyl amine, and oxygen-containing phosphide to form a sulfonium salt polymer, which is then converted into polyarylene sulfide without halogen-containing byproducts, using a process that enhances the conversion rate and yields a thermally resistant product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a halogen-containing process is used to produce polyarylene sulfide, then the polymer can be synthesized, but the yield is low and unrecyclable halogen-containing byproducts are produced causing environmental pollution
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by replacing halogen-containing reagents with non-halogen alternatives (using sulfonic acid, diphenyl amine, and oxygen-containing phosphide instead of halogen compounds). This parameter change eliminates the formation of halogen-containing byproducts while improving the yield of polyarylene sulfide through optimized reaction conditions
Solution Approach 2:
The patent converts the potentially harmful halogen-containing process into a beneficial non-halogen process by using sulfonic acid as a catalyst system that promotes polymerization without generating harmful byproducts. The sulfonic acid-diphenyl amine-oxygen-containing phosphide combination creates a beneficial reaction pathway that eliminates pollution while enhancing productivity
2Manufacturing precision
If conventional purification methods are used, then halogen-containing byproducts are removed, but the purification process is very difficult and time-consuming
Solution Approach 1:
The patent applies preliminary action by designing a polymerization process that prevents the formation of halogen-containing byproducts from the start. By using non-halogen reagents and sulfonic acid catalysis, the harmful substances are never generated in the first place, eliminating the need for subsequent purification steps and saving significant time
3Productivity
If the conversion rate of monomer to sulfonium salt polymer is low, then the polymerization can proceed, but the overall yield of polyarylene sulfide is reduced
Solution Approach 1:
The patent uses sulfonic acid as an intermediary catalyst that facilitates the conversion of monomer to sulfonium salt polymer with high efficiency. The sulfonic acid-diphenyl amine-oxygen-containing phosphide system acts as a mediator that promotes the polymerization reaction, achieving high conversion rates and subsequently high overall yields of polyarylene sulfide
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 method significantly increases the conversion rate of the monomer to sulfonium salt polymer and subsequently to polyarylene sulfide, producing a thermally resistant material with a melting temperature of at least 280°C, free from halogen-containing byproducts, thus improving yield and environmental sustainability.
Implementation Method 1
subjecting at least one monomer having a structure represented by Formula (I) to a reaction in the presence of sulfonic acid, diphenyl amine, and oxygen-containing phosphide, obtaining a sulfonium salt polymer
Data Source
AI summary
A method for preparing a polymer is provided. The method for preparing a polymer includes subjecting at least one monomer having a structure represented by Formula (I) to a reaction in the presence of sulfonic acid, diphenyl amine, and oxygen-containing phosphide, obtaining a sulfonium salt polymer , wherein x is 0, 1, or 2; R1 is C1-6 alkyl group; and R2 is independently hydrogen, or C1-6 alkyl group.