Polyester Poly(arylene ether) Blend Compatibilization
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Solution Overview
Problem
Existing poly(arylene ether)/polyester blends do not provide a sufficient balance of properties such as impact strength and dimensional stability, making them less commercially attractive due to unstable phase morphology during processing.
Innovation Solution
A thermoplastic composition comprising a polyester, functionalized poly(arylene ether), an impact modifier, and a polymeric compatibilizer with an average of greater than or equal to 3 pendant epoxy groups, where the disperse phase of poly(arylene ether) is less than 35 weight percent, stabilizing the phase morphology and enhancing impact strength and strain at break.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If poly(arylene ether) and polyester are blended to achieve dimensional stability and impact strength, then the balance of properties is insufficient, making the blends not commercially attractive
Solution Approach 1:
A polymeric compatibilizer containing pendant epoxy groups is introduced as an intermediary substance between poly(arylene ether) and polyester phases. The compatibilizer migrates to the phase interface and reduces interfacial tension, stabilizing the phase morphology during processing while maintaining the desired balance of impact strength and dimensional stability
Solution Approach 2:
The invention changes the chemical parameter of the blend system by incorporating functionalized poly(arylene ether) with specific pendant groups that can interact with the polyester phase. This chemical modification enables better interfacial adhesion and phase compatibility, resolving the contradiction between impact strength and phase stability
2Stability of the object's composition
If known poly(arylene ether)/polyester blends are used, then dimensional stability is achieved, but impact strength is insufficient
Solution Approach 1:
The polymeric compatibilizer acts as a mediator that enhances interfacial adhesion between the polyester matrix and poly(arylene ether) disperse phase. This improved interfacial bonding allows the disperse phase to effectively transfer and distribute stress, thereby improving impact strength while preserving dimensional stability
Solution Approach 2:
The invention creates a composite material system where polymeric compatibilizer molecules are incorporated at the phase interface, forming a three-component system (polyester matrix, poly(arylene ether) disperse phase, and compatibilizer at interface). This composite structure synergistically combines dimensional stability from the polyester matrix with enhanced impact strength from the stabilized phase morphology
Data Source
AI summary
Disclosed herein is a polymer composition comprising: a poly(arylene ether); a polyester; electrically conductive filler, and an impact modifier. The composition has a continuous phase comprising polyester and a disperse phase comprising poly(arylene ether). The amount of the disperse phase is less than 35 weight percent, based on the total weight of the composition.