Bio-Based Conductive Shape Memory Polymer Macrostructures
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Solution Overview
Problem
Current methods for additive manufacturing of shape memory polymers struggle to create 3D parts with spatial distribution of materials and micro-architectures for specific programmed deformation strategies, such as highly controlled sequential shape recovery, and face limitations in interlayer adhesion and toughness.
Innovation Solution
The development of a bio-based composite shape memory polymer material using a four-axis controlled direct ink writing system for thermally cured epoxy SMP carbon nano-fiber composites, allowing for multi-functional printing and reforming of macro-structures while maintaining micro-structure and shape memory behavior, enabling the creation of complex geometries and conductive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If direct ink writing is used to create 3D parts with spatial distribution of materials and micro-architectures, then manufacturing precision and design freedom are improved, but interlayer adhesion and toughness deteriorate
Solution Approach 1:
The patent uses composite materials consisting of shape memory polymer particles dispersed in a thermoplastic polymer matrix. This composite structure allows the material to maintain both the manufacturing precision needed for complex 3D micro-architectures and the toughness required for strong interlayer adhesion. The thermoplastic matrix provides structural integrity while the SMP particles provide shape memory functionality.
Solution Approach 2:
The patent employs parameter changes by controlling the glass transition temperature (Tg) of the shape memory polymer particles to be higher than the processing temperature of the thermoplastic matrix. This temperature parameter differentiation enables the SMP particles to maintain their shape memory properties during processing while the thermoplastic matrix can be melted and reformed for strong interlayer bonding during additive manufacturing.
2Adaptability or versatility
If complex geometries and multi-functional printing are implemented, then adaptability and application versatility are improved, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by incorporating shape memory polymer particles with different glass transition temperatures into a single printable material system. This allows one additive manufacturing process to produce parts with multiple functional responses (different shape recovery temperatures) and complex geometries, eliminating the need for multiple specialized printing systems.
Solution Approach 2:
The patent segments the functional properties by using discrete shape memory polymer particles with different Tg values dispersed throughout the continuous thermoplastic matrix. This segmentation allows independent control of different shape memory functionalities while maintaining a unified printable material system, reducing overall device complexity.
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
This approach enables the fabrication of free-standing parts that can span gaps, form foam-like micro-structures, and be programmed for multiple applications, with enhanced mechanical properties and the ability to maintain shape memory behavior across various structures and temperatures.
Implementation Method 1
They can be divided into filamentary-based approaches, such as robocasting (or robotic deposition), micropen writing, and fused deposition, and droplet-based approaches, such as ink-jet printing, and hot-melt printing
Implementation Method 2
additive manufacturing of bio-based conductive shape memory polymer macrostructure parts with highly ordered microstructures
Implementation Method 3
The original flat plate shape can be recovered by heating the material again
Data Source
AI summary
An additive manufacturing apparatus includes an additive manufacturing print head and a nozzle that receives a bio-based shape memory polymer material and a bio-based material. The nozzle extrudes the bio-based shape memory polymer material and the bio-based material onto a substrate to form a bio-based shape memory polymer part or product.