Polysiloxane 3D Printing via Metal-Free Photopolymerization
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Solution Overview
Problem
Conventional 3D printing methods for silicon-containing components rely on metal catalysts, leading to metal contamination, health and safety issues, and reduced long-term stability, while also requiring specific precursor formulations and direct-ink-write printing, which is slow and equipment-intensive.
Innovation Solution
A printable precursor composition comprising a polymerizable scaffold component and a curable siloxane-containing component, miscible and free of metal contaminants, is used to create polysiloxane-based objects through additive manufacturing techniques like digital light processing, allowing for the removal of the polymerized scaffold to produce a pure polysiloxane material with a polymer backbone of silicon-oxygen bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If metal catalysts are used to promote curing of silicon-containing components, then the curing process is accelerated, but metal contamination occurs which creates health and safety issues and reduces long-term stability
Solution Approach 1:
The patent removes metal catalysts from the curing process entirely, replacing them with a two-component system where a polymerizable scaffold component and a curable siloxane-containing component react without metal contamination, eliminating the harmful factor while maintaining curing functionality
Solution Approach 2:
The patent introduces a polymerizable scaffold component as an intermediary that enables the curing reaction to proceed without metal catalysts. The scaffold component reacts with the siloxane-containing component to form a hybrid structure that can later be washed away, leaving pure polysiloxane without metal contamination
2Ease of manufacture
If direct-ink-write printing is used for silicon-containing components, then the printing process can be performed, but the printing speed is very slow and specific precursor formulations are required
Solution Approach 1:
The patent creates a precursor composition that can be used with multiple additive manufacturing techniques including DLP, SLA, and other photopolymerization-based methods, not limited to direct-ink-write printing. This universal compatibility enables faster printing speeds while maintaining ease of manufacture
Solution Approach 2:
The patent modifies the precursor formulation parameters by creating a miscible combination of polymerizable scaffold component and curable siloxane-containing component with appropriate rheology and viscosity, enabling compatibility with high-speed photopolymerization printing methods while maintaining printability
3Ease of manufacture
If conventional precursor formulations are used for direct-ink-write printing, then printing can be performed, but new formulations must be developed for each different application
Solution Approach 1:
The patent creates a versatile precursor composition system where the polymerizable scaffold component and curable siloxane-containing component can be adjusted in ratio and composition to suit different applications, while maintaining a single fundamental formulation approach that works across multiple applications rather than requiring entirely new formulations for each case
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 method eliminates metal contamination, enhances the stability of printed silicon-containing components, and enables faster, more flexible, and cost-effective 3D printing using digital light processing, compatible with both miniaturization and scale-up techniques.
Implementation Method 1
exposing the printable precursor composition to an energy source that provides sufficient energy to polymerize the polymerizable scaffold component
Implementation Method 2
removing the polymerized scaffold from the cured polysiloxane-polymerized scaffold hybrid structure by exposing the cured polysiloxane-polymerized scaffold hybrid structure to a washing solution
Data Source
AI summary
Disclosed herein are embodiments of an additively manufactured polysiloxane-based object, as well as composition embodiments for making such object embodiments. Also disclosed are embodiments of a method for making the additively manufactured polysiloxane-based object using the composition embodiments described herein. The disclosed composition embodiments and method embodiments provide objects that are substantially free of contaminants that deleteriously affect structural integrity and that comprise a polymer skeleton consisting of oxygen-silicon bonds wherein the silicon component can further comprise one or more branching groups.