Poly(Arylene Sulfide) Composition for Flexibility and Thermal Ageing
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Solution Overview
Problem
Poly(arylene sulfide) polymers, despite their mechanical and thermal properties, are too inflexible and stiff for applications requiring high flexibility, toughness, and impact resistance, and their thermal stability is limited for under-the-hood applications in electric vehicles.
Innovation Solution
A composition comprising a poly(arylene sulfide) polymer blended with a polyorganosiloxane polymer having epoxy functional groups and an antioxidant compound, processed in the molten state to enhance deformation at break and thermal stability, suitable for 3D object manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If poly(arylene sulfide) polymer is used alone, then mechanical strength and thermal stability are maintained, but flexibility and toughness are insufficient
Solution Approach 1:
The patent applies composite materials by blending poly(arylene sulfide) polymer with polyorganosiloxane polymer having epoxy functional groups. This combination creates a composite system where the siloxane polymer acts as a toughening agent, introducing flexibility and impact resistance while the poly(arylene sulfide) maintains structural integrity and mechanical strength. The synergistic interaction between these two polymer components resolves the contradiction between strength and flexibility.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the weight ratio between poly(arylene sulfide) and polyorganosiloxane polymers (specifically 98:2 to 90:10), and by optimizing the antioxidant compound content (0.03 to 0.4% wt). These parameter adjustments allow the composition to achieve both high mechanical strength and improved flexibility, transforming the material properties to simultaneously satisfy both requirements.
2Temperature
If poly(arylene sulfide) polymer is used alone, then inherent thermal stability is maintained, but high-temperature performance for under-the-hood applications is limited
Solution Approach 1:
The patent uses composite materials to enhance high-temperature performance by combining poly(arylene sulfide) with polyorganosiloxane polymer containing epoxy groups. The siloxane component contributes superior heat resistance and thermal stability, enabling the composite to withstand under-the-hood temperatures (up to 200°C or higher) while maintaining mechanical properties. This composite approach reliably meets stringent thermal requirements for automotive applications.
Solution Approach 2:
The patent incorporates small amounts of antioxidant compounds (0.03 to 0.4% wt) as sacrificial protective agents. These antioxidants sacrifice themselves by preferentially reacting with oxidative species, thereby protecting the polymer matrix from thermal degradation and oxidation at elevated temperatures. This allows the material to maintain reliability under high-temperature conditions throughout its service life.
3Reliability
If antioxidant compound is added to improve thermal stability, then thermal ageing resistance is enhanced, but deformation at break may be reduced
Solution Approach 1:
The patent optimizes the antioxidant compound content within a specific range (0.03 to 0.4% wt) to balance thermal ageing resistance and deformation at break. By controlling the antioxidant concentration at these precise levels, the composition achieves sufficient thermal stability protection while minimizing the negative impact on flexibility and elongation properties. This parameter optimization resolves the contradiction between protection and ductility.
Solution Approach 2:
The patent uses the composite system of poly(arylene sulfide) and polyorganosiloxane polymer to counterbalance the stiffening effect of antioxidants. The siloxane component provides inherent flexibility and toughness that compensates for the reduced deformation at break caused by antioxidant addition, thereby maintaining overall material ductility while achieving thermal ageing resistance.
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
The composition exhibits significantly improved deformation at break and thermal stability, providing a synergistic effect that surpasses the properties of poly(arylene sulfide) polymers without the antioxidant or with higher antioxidant amounts, making it suitable for high-temperature, flexible, and tough thermoplastic applications.
Implementation Method 1
A composition comprising a poly(arylene sulfide) polymer blended with a polyorganosiloxane polymer having epoxy functional groups and an antioxidant compound, processed in the molten state to enhance deformation at break and thermal stability
Implementation Method 2
at least one antioxidant compound [compound (O)], in an amount of 0.03 to 0.4% wt, with respect to the weight of polymer (PAS)
Data Source
AI summary
The present invention relates to a poly(arylene sulfide) composition including a combination of a limited amount of an antioxidant compound and of an epoxy-functional polyorganosiloxane polymer, possessing improved mechanical performances and outstanding thermal ageing resistance, to a process for its manufacturing, as well as to an article, part or composite material comprising said composition, and to the use of this composition for the manufacture of 3D objects