Use of a sulfonated polyaryl ether ketone or of a sulfonated non-polymeric aryl ether ketone as a dispersant
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for impregnating reinforcing fibers with polyaryl ether ketone (PAEK) resin using aqueous dispersion face challenges in achieving homogeneous distribution while maintaining the thermal stability of PAEK, as conventional surfactants degrade at high temperatures, leading to polymer degradation and unsatisfactory composite properties.
Innovation Solution
The use of sulfonated polyaryl ether ketone or sulfonated non-polymeric aryl ether ketone as a dispersant in an aqueous solution for PAEK resin powders, which promotes homogeneous dispersion and avoids thermal degradation, potentially replacing conventional surfactants and reducing porosity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional surfactants are used as dispersants in aqueous dispersion, then homogeneous distribution of resin particles is achieved, but thermal stability of PAEK is compromised due to degradation at high temperatures
Solution Approach 1:
The patent uses sulfonated PAEK as an intermediary dispersant that mediates between the hydrophobic resin particles and the aqueous medium. This sulfonated polymer provides both dispersing capability and thermal stability, eliminating the need for conventional surfactants that degrade at high temperatures. The sulfonated PAEK acts as a bridge that maintains homogeneous distribution while withstanding the thermal processing conditions.
Solution Approach 2:
The patent changes the chemical parameters of the dispersant by using sulfonated PAEK instead of conventional surfactants. The sulfonation introduces ionic groups that provide both dispersing power and thermal stability. This parameter change in the dispersant's chemical structure allows it to maintain effectiveness at high temperatures where conventional surfactants would degrade.
2Ease of manufacture
If conventional surfactants with ethoxylated chains are used, then dispersion is promoted, but polymer degradation occurs due to oxidation and radical formation at high temperatures
Solution Approach 1:
Instead of using conventional surfactants that have short thermal life and decompose into harmful radicals, the patent employs sulfonated PAEK which maintains stability throughout the entire processing cycle. The sulfonated dispersant does not decompose into harmful substances but rather maintains its structural integrity, preventing polymer degradation throughout the manufacturing process.
Solution Approach 2:
The patent converts the typically harmful effect of high temperature exposure into a benefit by using a dispersant that is specifically designed to be thermally stable. The sulfonated PAEK utilizes the high temperature conditions to maintain its dispersing function without degradation, turning the harsh thermal environment into an opportunity to demonstrate the superior stability of the sulfonated dispersant system.
3Stability of the object's composition
If sulfonated PAEK is used as dispersant, then thermal stability is maintained and homogeneous dispersion is achieved, but porosity issues may arise from desulfonation under implementation conditions
Solution Approach 1:
The patent applies preliminary sulfonation to the PAEK dispersant before use, creating a pre-stabilized dispersant that is resistant to further sulfonation or desulfonation during processing. This preliminary chemical modification ensures that the dispersant maintains its properties throughout the manufacturing process, preventing porosity issues that would result from loss of sulfonated groups under processing conditions.
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 enables the creation of stable, homogeneous PAEK dispersions that maintain high thermal stability, improving the manufacturing process and properties of composite materials by enhancing bonding between fibers and the PAEK matrix, potentially eliminating the need for fiber sizing and reducing porosity.
Implementation Method 1
use of a sulfonated polyaryl ether ketone or of a sulfonated non-polymeric aryl ether ketone as a dispersant for polyaryl ether ketone resin powders
Implementation Method 2
avoiding the deterioration of the thermal stability of the PAEK
Data Source
AI summary
The use of a sulfonated polyaryl ether ketone or of a sulfonated non-polymeric aryl ether ketone as a dispersant for a polyaryl ether ketone resin powder in an aqueous solution, and also to a corresponding composition, and to a process for preparing a semifinished product comprising a polyaryl ether ketone resin and reinforcing fibers.