Halogen-Free Polyarylene Sulfide Synthesis via Catalyst Substitution
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Solution Overview
Problem
Conventional methods for preparing polyarylene sulfide (PAS) and polythioether sulfone (PTES) involve halogen-containing processes, resulting in low yields and environmental pollution due to unrecyclable halogen-containing byproducts.
Innovation Solution
A method involving the reaction of compounds represented by specific formulas in the presence of halogen-free catalysts and solvents, eliminating the need for halogen-containing side product removal and enhancing product yield and molecular weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If halogen-containing processes are used to prepare polyarylene sulfide and polythioether sulfone, then the polymerization can proceed, but the yield is low and halogen-containing byproducts cause environmental pollution
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by replacing halogen-containing reagents with halogen-free alternatives. Specifically, it uses non-halogenated aromatic compounds as starting materials and employs catalysts that do not contain halogen, fundamentally altering the reaction pathway to eliminate halogen-containing byproducts while maintaining polymerization efficiency and improving yield
Solution Approach 2:
The patent converts the harmful halogen-containing process into a beneficial halogen-free process. By deliberately choosing halogen-free starting materials and catalysts, the method transforms what was previously a source of pollution (halogen reagents) into an environmental advantage, producing no halogen-containing waste while achieving high yields
2Ease of manufacture
If halogen-containing processes are used, then polymerization occurs, but additional steps are required to remove halogen-containing side products, increasing complexity and cost
Solution Approach 1:
The patent extracts and eliminates the harmful halogen-containing components from the entire process. By removing halogen-containing reagents, catalysts, and intermediates from the reaction system, the method eliminates the need for subsequent removal steps, simplifying the overall manufacturing process while maintaining product quality
Solution Approach 2:
Instead of performing polymerization with halogen-containing reagents and then removing the harmful byproducts (the conventional approach), the patent inverts the logic by starting with halogen-free reagents from the beginning. This reversal eliminates the need for removal steps entirely, simplifying the process
3Reliability
If conventional halogen-containing methods are used, then polymerization can proceed, but molecular weight and polydispersity index are not optimized
Solution Approach 1:
The patent optimizes polymer quality by changing the reaction parameters to halogen-free conditions. This includes using halogen-free catalysts, controlling reaction temperature and time, and selecting appropriate halogen-free solvents or solvent-free conditions. These parameter changes result in improved molecular weight control and reduced polydispersity index, enhancing overall polymer quality
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 approach produces halogen-free monomers and polymers with increased molecular weight and reduced polydispersity index, reducing preparation costs and environmental impact.
Implementation Method 1
A compound having a structure represented by Formula (I) is reacted with a compound having a structure represented by Formula (III) in the presence of a compound having a structure represented by Formula (II), obtaining a compound having a structure represented by Formula (IV)
Implementation Method 2
The compound having the structure represented by Formula (IV) is reacted with a compound (A), obtaining a compound having the structure represented by Formula (V). The compound (A) is nitric acid, sulfuric acid, acetic acid, hydrogen peroxide, or a combination thereof
Implementation Method 3
The compound having the structure represented by Formula (V) is reacted with a compound having a structure represented by Formula (VI), obtaining a polymer having a repeat unit represented by Formula (VII)
Data Source
AI summary
A method for preparing a compound and a method for preparing a polymer employing the same are provided. The method for preparing a compound includes reacting a compound having a structure represented by Formula (I) with a compound having a structure represented by Formula (III) in the presence of a compound having a structure represented by Formula (II) to obtain a compound having a structure represented by Formula (IV)wherein Ar1 is substituted or unsubstituted aryl group; X is —O—, —S—, or —NH—; R1 is independently hydrogen or C1-6 alkyl group; R2 is hydroxyl group, C1-6 alkyl group, phenyl group, or tolyl group; and R3 is independently C1-6 alkyl group, C5-8 cycloalkyl group, or C2-6 alkoxyalkyl group.