3D Printed Shape Memory Polymer Composites with Hierarchical Porosity
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Solution Overview
Problem
Stochastic elastomeric foams lack long-term mechanical performance due to high local stress concentrations, leading to material failure, and there is a need for ordered, predictable, and reproducible porous structures with architectural complexity.
Innovation Solution
A 3D printed polymer structure with hierarchical porosity is created using a matrix material, a filler, and gas-filled microballoons, which provides elastomeric shape memory and tunable mechanical behavior, allowing for controlled structural deformation in response to external stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stochastic elastomeric foams are used, then manufacturing simplicity is maintained, but mechanical performance deteriorates due to high local stress concentrations
Solution Approach 1:
The patent transforms the random stochastic structure into an ordered periodic lattice structure with controlled parameters (cell size, wall thickness, node configuration). This parameter change from random to ordered geometry eliminates stress concentration points while maintaining manufacturability through 3D printing processes.
Solution Approach 2:
The patent creates a composite structure combining elastomeric material with an ordered porous lattice architecture. The hierarchical design integrates micro-scale pore formation with macro-scale lattice geometry, achieving enhanced mechanical performance through structural composition rather than material composition alone.
2Ease of manufacture
If stochastic foams are used, then manufacturing simplicity is maintained, but reliability deteriorates due to localized material failure
Solution Approach 1:
The patent changes the structural parameters from random stochastic distribution to ordered periodic arrangement with uniform cell sizes and wall thicknesses. This parameter optimization ensures even stress distribution throughout the structure, preventing localized failure and improving long-term reliability while maintaining 3D printing manufacturability.
Solution Approach 2:
The patent segments the continuous elastomeric material into an ordered network of discrete cells and struts. This segmentation creates a modular lattice structure where stress is distributed across multiple independent load-bearing elements, preventing catastrophic failure and enhancing reliability.
3Strength
If 3D printed ordered porous structures are created, then mechanical performance is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal periodic lattice unit cell that can be replicated and scaled to create various structures with different mechanical properties. This universal building block approach simplifies the design process while achieving complex mechanical performance through geometric variation rather than material complexity.
Solution Approach 2:
The patent achieves different mechanical performances by changing geometric parameters (cell size, wall thickness, node configuration) of a standardized lattice structure rather than creating fundamentally different designs. This parameter-based design simplifies manufacturing setup and process complexity.
4Reliability
If gas-filled microballoons are incorporated into the matrix, then shape memory behavior is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates gas-filled microballoons as porous inclusions within the elastomeric matrix. These microballoons create internal voids that enable reversible deformation and shape memory effects. The porous structure allows the material to undergo significant strain while maintaining structural integrity, enhancing shape memory behavior through controlled porosity.
Solution Approach 2:
The patent creates a composite material system combining the elastomeric matrix with dispersed gas-filled microballoon particles. This composite approach integrates two distinct material phases, where the microballoons provide shape memory functionality while the matrix provides structural continuity, achieving enhanced performance through material composition.
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 3D printed structure achieves significant shape memory behavior, with up to 97% recovery of original thickness and porosity, enabling applications in wearable protective padding and cushions, and other complex structures requiring shape memory properties.
Implementation Method 1
a porous three-dimensional (3D) printed polymer structure having elastomeric shape memory
Implementation Method 2
the structure includes a material comprising a plurality of gas-filled microballoons
Implementation Method 3
The 3D printed polymer structure has hierarchical porosity
Implementation Method 4
3D printing of silicones has been used to create mechanical energy absorbing materials
Data Source
AI summary
In accordance with one aspect of the presently disclosed inventive concepts, a product includes a porous three-dimensional (3D) printed polymer structure having elastomeric shape memory, where the structure includes a material comprising a plurality of gas-filled microballoons. The 3D printed polymer structure has hierarchical porosity.