Polymerizable Composition for Single-Wavelength Multi-Material Curing
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Solution Overview
Problem
Existing multi-material synthesis methods in additive manufacturing require multiple resins, leading to material waste and lengthy manufacturing processes, and decoupling photoinitiated radical and cationic polymerizations with one wavelength of light has not been feasible due to uncontrolled characteristics and health hazards associated with traditional photoacid generators.
Innovation Solution
A polymerizable composition and method using a single wavelength of light to selectively polymerize different monomers through a photobuffer system, employing coordinating and non-coordinating anions in photoacid generators, allowing for controlled switching between radical and cationic polymerizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple individual resins are used for multi-material synthesis, then material waste and manufacturing time increase, but the ability to produce complex multi-materials is improved
Solution Approach 1:
The patent combines multiple polymerizable monomers (radical and cationic) into a single resin composition that can be cured simultaneously or sequentially. This merging of materials eliminates the need for multiple separate resins, reducing manufacturing steps and time while maintaining the ability to produce complex multi-material structures with spatially tunable properties.
Solution Approach 2:
The resin composition is designed to perform multiple functions: it contains both radical-polymerizable and cationic-polymerizable monomers along with dual photoinitiators, enabling the same material to be processed into different polymer networks under different光照 conditions. This universal composition can produce various material properties and structures from a single starting material.
2Productivity
If traditional photoacid generators with non-coordinating anions are used, then rapid cationic polymerization is achieved, but health hazards increase
Solution Approach 1:
The patent changes the chemical parameters of the photoacid generator by using coordinating anions (such as tetrafluoroborate, hexafluorophosphate) instead of traditional non-coordinating anions. This parameter change reduces the strength of the generated acid and associated health hazards while still enabling cationic polymerization when combined with appropriate catalysts and光照 conditions.
Solution Approach 2:
The patent introduces metal halide catalysts (such as aluminum chloride, iron chloride) as intermediaries that work in conjunction with the photoacid generator. The catalyst mediates the polymerization process, allowing the use of safer coordinating anions while still achieving effective cationic polymerization through the catalytic cycle.
3Object-affected harmful factors
If coordinating anion-based photoacid generators are used, then safety is improved, but polymerization rate decreases
Solution Approach 1:
The patent creates a composite photopolymerization system combining coordinating anion-based photoacid generators with metal halide catalysts. This composite approach leverages the safety advantages of coordinating anions while using the catalyst to enhance and control the polymerization rate, achieving both safety and productivity goals through synergistic interaction between components.
4Manufacturing precision
If decoupling radical and cationic polymerizations is attempted with one wavelength of light, then process control is improved, but feasibility decreases due to uncontrolled characteristics
Solution Approach 1:
The patent segments the photopolymerization process by using two distinct photoinitiator systems with different activation characteristics: a Type I photoinitiator for radical polymerization and a photoacid generator for cationic polymerization. By selecting photoinitiators with different absorption characteristics and reaction mechanisms, the patent enables selective activation of each polymerization type, improving process control and reliability.
Solution Approach 2:
The patent introduces dynamic control capabilities by using photoinitiators and catalysts with different activation energies and reaction kinetics. This allows the polymerization process to be dynamically controlled - radical polymerization can be initiated first, followed by cationic polymerization, or both can proceed simultaneously in controlled proportions, enabling precise manipulation of material properties during processing.
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
Enables efficient, controlled polymerization of multi-materials in one pot, reducing waste and manufacturing time, while using safer, coordinating anion-based photoacid generators, and achieving spatially tunable properties in materials.
Implementation Method 1
Photoacid generators (PAGs) are a class of light-sensitive molecules that generate acids upon light exposure, inducing photoinitiated cationic polymerizations
Implementation Method 2
addition of a photobuffer, such as a coordinating anion, to the composition buffers acid generation upon exposure to a short duration of light
Implementation Method 3
irradiating a polymerizable composition with a first dosage of light comprising a first wavelength of light, where at least a portion of the first monomer is polymerized
Data Source
AI summary
Polymerizable compositions, polymerization methods, and articles of manufacture. In various examples, a polymerization method comprises first monomer(s); second monomer(s); first polymerization agent(s); second polymerization agent(s); and optionally, one or more hydrogen bond donor(s). In various examples, a polymerizable composition is suitable for use in a 3-D printing method, an additive manufacturing method, in a photocurable thermoset application, or any combination thereof. In various examples, a polymerization method comprises: irradiating a polymerizable composition with a first dosage of light, where at least a portion of the first monomer(s) is/are polymerized and substantially none the second monomer(s) is/are polymerized and irradiating the irradiated polymerization composition with a second dosage of light, where at least a portion of the second monomer is polymerized, and the first wavelength and the second wavelength are substantially the same. In various examples, an article of manufacture comprises thermoset polymer(s) of the present disclosure.