3D Printing of Polyamide Materials with Voxel-Level Property Control
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Solution Overview
Problem
Existing 3D inkjet printing technologies are limited by the narrow choice of materials and chemical reactions, primarily relying on photopolymerizable materials like acrylics, which restrict the range of mechanical and chemical properties that can be achieved in printed objects.
Innovation Solution
A dual-jetting method is employed to control the properties of printed objects at the voxel level by combining two compositions that undergo anionic ring-opening polymerization, allowing for the formation of polyamide materials with customizable mechanical and chemical properties through controlled ratios of caprolactam and a promoter composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photopolymerizable materials like acrylics are used in 3D inkjet printing, then the printing process can be performed with rapid curing, but the choice of materials and chemical reactions is narrow
Solution Approach 1:
The patent changes the chemical reaction parameters from photopolymerization to anionic ring-opening polymerization, enabling the use of different monomers (caprolactam, glycolide, lactide) and achieving both rapid curing and expanded material versatility. This parameter change allows tuning of mechanical properties while maintaining fast processing speeds.
Solution Approach 2:
The patent employs composite material systems by combining initiators (e.g., sodium caprolactam, magnesium bromide caprolactam) with various monomers to create diverse polymerizable compositions. These composite systems enable a wide range of material properties while maintaining compatibility with inkjet printing and rapid curing processes.
2Device complexity
If a single composition is used for printing, then the process is simple, but the ability to control material properties at voxel level is limited
Solution Approach 1:
The patent segments the printing process into multiple inkjet printing heads, each dispensing different compositions (monomer, initiator, promoter). This segmentation enables voxel-level control of material properties by selectively combining different compositions at each voxel location, achieving precise mechanical property tailoring while maintaining processability.
Solution Approach 2:
The patent implements local quality control by varying the composition ratios of monomers and initiators at different voxel locations. This allows different regions of the printed object to have different mechanical properties (flexible, rigid, impact-resistant) tailored to specific functional requirements, while the overall process remains integrated and controlled.
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 production of objects with tailored mechanical and chemical properties at the voxel level, overcoming the limitations of traditional 3D inkjet printing by allowing for varied and controlled material properties in printed structures.
Implementation Method 1
the first and second compositions undergo anionic ring-opening polymerization
Implementation Method 2
a chemical composition is dispensed in droplets from a dispensing head having a set of nozzles to form layers on a receiving medium
Data Source
AI summary
Provided are methods of fabricating an object, effected by jetting two or more different compositions, each containing a different material or mixture of materials, which, when contacted on a receiving medium, undergo a chemical reaction therebetween to form the building material. The chemical composition of the formed building material is dictated by a ratio of the number of voxels of each composition in a voxel block. Systems for executing the methods, and printed objects obtained thereby are also provided.