Photothermal Curing of Thermoset Resins via Nanoparticle Activation
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Solution Overview
Problem
Current thermosetting polymer curing methods, especially for additive manufacturing, face challenges in achieving effective on-demand curing due to difficulties in applying rapid heating and cooling cycles, which limits the scalability and efficiency of bulk polymerization processes.
Innovation Solution
The use of a thermosetting formulation comprising reactive polysiloxanes, a curing agent with reactive functional groups, and photothermally active materials like metal nanoparticles, which absorb actinic radiation to generate localized heat for on-demand curing, allowing for rapid crosslinking and formation of three-dimensional objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional thermal curing methods are used for bulk polymerization, then curing can be achieved, but the process lacks scalability and efficiency due to difficulty in applying rapid heating and cooling cycles
Solution Approach 1:
The patent replaces conventional thermal heating systems with photothermal activation using metal nanoparticles that absorb light energy and convert it to localized heat. This substitution enables rapid, on-demand curing without the need for complex thermal processing equipment, directly addressing the scalability issue in bulk polymerization while maintaining high curing rates.
Solution Approach 2:
The patent applies photothermal heating locally at the nanoparticle level rather than heating the entire bulk material uniformly. This localized heating approach allows rapid curing at the point of irradiation while maintaining room temperature elsewhere in the bulk polymerization mixture, enabling scalable processing by activating only the portion of material that needs curing at any given time.
2Productivity
If high bulk temperatures are used to drive chemical reactions, then reactions can proceed, but the process becomes inefficient and difficult to control for on-demand curing
Solution Approach 1:
The patent implements localized photothermal heating at the nanoparticle level, creating high temperature zones only where and when needed for the chemical reaction, while the rest of the bulk material remains at room temperature. This eliminates the time required to heat and cool the entire bulk material, enabling on-demand curing with minimal time loss.
Solution Approach 2:
The patent enables periodic or on-demand curing by applying actinic radiation only when curing is required, rather than maintaining continuous high-temperature heating. The metal nanoparticles can be activated and deactivated by controlling light exposure, allowing the curing process to occur periodically at high rates without the time penalty of continuous thermal processing.
3Adaptability or versatility
If conventional curing methods are used, then thermosetting formulations can be cured, but the process cannot achieve on-demand curing for additive manufacturing applications
Solution Approach 1:
The patent replaces conventional thermal curing systems with photothermal activation using metal nanoparticles that absorb light energy and convert it to localized heat. This substitution enables rapid, on-demand curing without the need for complex thermal processing equipment, directly addressing the scalability issue in bulk polymerization while maintaining high curing rates.
Solution Approach 2:
The patent creates a universal curing system where metal nanoparticles serve multiple functions: they act as photothermal converters, reaction catalysts, and temperature control elements. This multi-functionality enables on-demand curing for additive manufacturing while maintaining high productivity, as the same nanoparticle system facilitates both the curing mechanism and the process control.
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 significant enhancement of curing rates, with a 440-fold increase in the curing rate of polydimethylsiloxane, facilitating efficient bulk polymerization and additive manufacturing by maintaining bulk temperatures at room temperature while achieving high localized heating, thus overcoming the limitations of traditional thermal curing methods.
Implementation Method 1
photothermal curing of thermoset resins with photothermally active material such as nanometal particles which absorb actinic radiation
Implementation Method 2
Plasmonic heating via the photothermal effect of metal nanoparticles and its subsequent use to drive chemical reactions
Implementation Method 3
a compound including reactive functional groups, and a curing agent having functional groups reactive with the reactive functional groups of the compound
Data Source
AI summary
Thermosetting formulations useful for forming bulk structures such as in additive manufacturing can include (a) a compound including reactive functional groups, (b) a curing agent having functional groups reactive with the reactive functional groups of the compound, and (c) a photothermally active material. Such formulations can be cured by applying actinic radiation to the formulation.