Polyarylene Sulfide Polymer with Alternating Aryl Groups
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Solution Overview
Problem
Conventional polyarylene sulfide production methods result in low yield and environmental pollution due to halogen-containing byproducts, and the random arrangement of repeating units limits the enhancement of thermal, chemical, and electrical insulation characteristics.
Innovation Solution
A polymer with a repeating unit structure featuring alternately arranged different aryl groups, represented by Formulas (I) and (II), which is synthesized through specific reactions involving sulfuric acid and nucleophiles to enhance crystallinity and resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the halogen-containing process is used to produce polyarylene sulfide, then the production can be achieved, but the yield is low and environmental pollution occurs due to halogen-containing byproducts
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by replacing halogen-containing reagents with non-halogen alternatives (such as using sulfur trioxide or sulfuric acid instead of halogenating agents), thereby eliminating harmful byproducts while improving yield. This parameter change transforms the chemical composition of the reaction system to achieve both high productivity and environmental friendliness.
2Reliability
If conventional polyarylene sulfides with two different repeating units are arranged in a random fashion, then the material can be produced, but the thermal resistance, chemical resistance, flame resistance, and electrical insulation characteristics cannot be enhanced
Solution Approach 1:
The patent introduces asymmetry in the molecular structure by using two different aromatic rings (Ar1 and Ar2) in the repeating unit, where Ar1 and Ar2 are defined as different substituted or unsubstituted aryl groups. This structural asymmetry prevents random packing and promotes ordered alternating arrangements, thereby enhancing the material's thermal, chemical, and electrical properties while maintaining compositional stability.
Solution Approach 2:
The patent applies local quality by creating regions with different aromatic ring structures (Ar1 and Ar2) that alternate in a specific pattern within the polymer chain. This local differentiation of structural properties allows for optimized intermolecular interactions and packing arrangements, leading to enhanced overall material performance in terms of thermal resistance, chemical resistance, flame resistance, and electrical insulation.
Data Source
AI summary
A polymer is provided. The polymer has a repeating unit having a structure represented by Formula (I) or Formula (II)wherein Ar1 and Ar2 can be substituted or unsubstituted aryl diradical; Y− can be R2SO3− or ClO4−; R1 can be C1-6 alkyl; Ar1 and Ar2 are different; and, R2 can be C1-6 alkyl, substituted or unsubstituted aromatic ring, or C1-6 haloalkyl.