Blended Polyester Compositions with Compatibilizing Agent
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Solution Overview
Problem
Polyester polymers face challenges in processing due to high viscosities, low melt strength, and surface appearance issues, such as dullness, and struggle to achieve a balance of strength and elongation properties when combined with reinforcing fibers.
Innovation Solution
A blend of different polyester polymers, including polyethylene terephthalate, polybutylene terephthalate, and thermotropic liquid crystalline polymers, is combined with a compatibilizing agent like pentaerythritol diphosphite to inhibit adverse reactions and enhance compatibility, resulting in a composition with improved strength, gloss, and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyester polymers are used to produce molded products, then chemical resistance and strength properties are improved, but processing difficulties arise due to high viscosities
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyester polymer by incorporating specific comonomers and controlling molecular weight distribution, which changes the viscosity characteristics while preserving strength properties, thereby improving processability
2Ease of operation
If polyester elastomers are used to increase flexibility, then elongation properties are improved, but melt strength decreases causing extrusion and blow molding issues
Solution Approach 1:
The patent creates a segmented structure where hard segments provide melt strength for processing while soft segments provide flexibility and elongation. This local differentiation of properties within the elastomer structure resolves the contradiction between flexibility and melt strength
Solution Approach 2:
The patent combines polyester elastomer with other polyester components to create a composite material system where the different components contribute different properties, achieving both flexibility and adequate melt strength for processing
3Strength
If polyester polymers are used to achieve desired strength properties, then tensile strength is improved, but surface appearance deteriorates with dullness and yellowing
Solution Approach 1:
The patent adjusts compositional parameters including the ratio of aromatic to aliphatic components and adds specific additives that maintain tensile strength while improving surface gloss and color stability, preventing yellowing over time
4Strength
If reinforcing fibers are incorporated into polyester polymer matrix, then modulus is improved, but elongation at break decreases
Solution Approach 1:
The patent introduces a compatibilizing agent as an intermediary substance that improves the interface between reinforcing fibers and the polyester matrix, allowing stress transfer that maintains both high modulus and adequate elongation at break
Data Source
AI summary
Polyester polymer compositions are described containing a blend of different polyester polymers. The different polyester polymers can be blended together in order to produce an overall composition having a desired balance of physical properties and surface characteristics. In one embodiment, a compatibilizing agent can be added to prevent the polyester polymers from adversely interacting with each other. The composition can contain glass fibers and/or a thermally conductive particulate material. Polymer compositions can be produced having excellent strength characteristics, high glossiness characteristics, and can be thermally conductive.