Thermoplastic molding composition with high temperature resistance comprising a thermotropic polymer
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Solution Overview
Problem
Existing thermoplastic molding compositions based on polyarylene ether sulfone polymers face challenges with limited toughness due to weak interactions between fibrous or particulate fillers and the polymer matrix, requiring improved mechanical properties and processing stability.
Innovation Solution
A thermoplastic molding composition comprising 25 to 94% non-sulfonated polyarylene ether sulfone polymer, 1 to 10% sulfonated polyarylene ether sulfone polymer, 4 to 70% fibrous/particulate filler, and 1 to 10% thermotropic polymer, with specific heat deflection temperatures and thermotropic polymer compositions, enhancing mechanical properties and processing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fibrous or particulate fillers are added to polyarylene ether sulfone polymers to increase stiffness and strength, then mechanical strength is improved, but toughness is significantly limited due to weak interaction between fillers and polymer matrix
Solution Approach 1:
A compatibilizer comprising a polyarylene ether sulfone polymer with reactive end groups (carboxylic acid groups or hydroxyl groups) is introduced as an intermediary substance. This compatibilizer chemically bonds to the fibrous or particulate fillers, creating a strong interface between the filler and the polymer matrix, thereby improving toughness while maintaining the stiffness and strength benefits of the fillers
Solution Approach 2:
The invention changes the chemical parameters of the polymer matrix by introducing polyarylene ether sulfone polymers with specific functional end groups. These reactive end groups enable chemical bonding interactions with fillers, transforming the weak physical interaction into strong chemical bonds, thus improving the overall mechanical properties including toughness
2Strength
If functionalized polyarylene ether sulfone polymers are used as compatibilizers to improve adhesion to fillers, then interfacial adhesion is enhanced, but processing complexity increases
Solution Approach 1:
The invention combines the base polyarylene ether sulfone polymer and the compatibilizer with reactive end groups into a single molding composition formulation. This merging allows both components to be processed together in one step, simplifying the overall processing while achieving enhanced interfacial adhesion through the reactive end groups of the compatibilizer
3Productivity
If high reaction temperatures are used for polycondensation reactions to form polyarylene ether sulfone polymers, then polymerization efficiency is improved, but energy consumption increases
Solution Approach 1:
The invention changes the reaction parameters by using specific catalysts and solvent systems that enable polycondensation reactions to proceed at lower temperatures while maintaining high polymerization efficiency. This reduces energy consumption without sacrificing productivity
Data Source
AI summary
The present invention relates to a thermoplastic molding composition comprising as components at least one non-sulfonated polyarylene ether sulfone polymer (P), at least one sulfonated polyarylene ether sulfone polymer (sP) and at least one fibrous and/or particulate filler and at least one thermotropic polymer. The present invention furthermore relates to a process for the manufacturing of a molded article using the thermoplastic molding composition and a molded article obtained by this process.