Self-Reinforcing Thermoplastic Composites via Aligned LCP Fibril Extrusion
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Solution Overview
Problem
Existing reinforced plastic composite materials are difficult and expensive to manufacture, and challenging to recycle, limiting their widespread application in structural parts and automotive industries.
Innovation Solution
A thermoplastic extruded composite comprising a thermoplastic polymer matrix material with aligned elongate thermoplastic liquid crystal polymer fibrils, achieved by controlling viscosity ratios and adding viscosity enhancers or reducers, compatibilizers, and stabilizers during extrusion, forming a filament that can be used in 3D printing or pelletized for further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional fiber-reinforced polymer composite materials are used, then mechanical strength and structural properties are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention uses a composite material system consisting of thermoplastic polymer matrix and thermotropic liquid crystal polymer fibrils. The liquid crystal polymer forms self-aligned fibrils during extrusion that act as reinforcement, combining the benefits of composite materials (enhanced mechanical properties) with a simplified single-step extrusion manufacturing process, eliminating the need for complex fiber laying and consolidation operations
Solution Approach 2:
The invention controls the viscosity ratio between the thermoplastic polymer matrix and thermotropic liquid crystal polymer at specific processing conditions. By maintaining the matrix viscosity at least twice that of the liquid crystal polymer during extrusion, the liquid crystal polymer forms elongated self-aligned fibrils. This parameter control enables automatic fibril formation and alignment during extrusion, simplifying manufacturing while achieving reinforced composite structure
2Strength
If traditional fiber-reinforced polymer composite materials are used, then structural properties are improved, but manufacturing cost increases
Solution Approach 1:
The invention merges the matrix material and reinforcement material into a single composite extrudate produced in one continuous extrusion process. The thermoplastic polymer and thermotropic liquid crystal polymer are co-extruded, with the liquid crystal polymer automatically forming aligned fibrils during the process. This eliminates multiple separate manufacturing steps (fiber preparation, laying, consolidation, curing) required for traditional composites, significantly reducing manufacturing cost
Solution Approach 2:
The thermotropic liquid crystal polymer exhibits self-aligning behavior during extrusion, automatically forming elongated fibrils aligned with the flow direction without requiring external alignment equipment or complex processing steps. This self-organization property of the liquid crystal polymer provides the reinforcement structure autonomously, reducing manufacturing complexity and cost while maintaining structural properties
3Productivity
If thermoplastic polymer matrix with thermotropic liquid crystal polymer fibrils is extruded, then manufacturing cost decreases and production rate increases, but viscosity control complexity increases
Solution Approach 1:
The invention specifies controlling the viscosity ratio between matrix and liquid crystal polymer to be at least 2:1 at extrusion temperature. This clear parameter guideline simplifies the complexity by providing a specific target range for formulation and processing, enabling consistent fibril formation across different material systems and production conditions while maintaining high production rates through continuous extrusion
Data Source
AI summary
A thermoplastic composite elongate extrudate having a thermoplastic polymer matrix material with a plurality of elongate thermoplastic liquid crystal polymer fibrils generally aligned with the direction of extrusion. A method of making a thermoplastic composite includes mixing a thermoplastic polymer matrix material and a thermoplastic liquid crystal polymer, where the viscosity of the thermoplastic polymer matrix material is sufficiently greater than the viscosity of the thermoplastic liquid crystal polymer, and extruding the mixture to create a composite elongate extrudate comprising a thermoplastic polymer matrix material with a plurality of elongate thermoplastic liquid crystal polymer fibrils generally aligned with the direction of extrusion.