3D Photopolymerization at an Immiscible Liquid Interface

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Solution Overview

Problem

Conventional UV curable polymer-based additive manufacturing faces issues with stiction between solid polymers and solid boundaries, limiting geometry and requiring mechanical separation that can damage the polymer and restrict feature aspect ratios.

Innovation Solution

Incorporating an inert immiscible liquid at the interface between the liquid monomer and solid boundary, allowing polymerization to occur at a liquid-liquid interface, reducing or eliminating stiction forces and enabling smoother, continuous polymer formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If polymerization occurs at a solid boundary interface, then structural support is provided, but stiction forces occur between solid polymer and solid boundary

Engineering Contradiction:

Improvestructural supportVSAvoidstiction forces

Core Design Contradiction:

StrengthVSForce

Solution Approach 1:

An inert liquid layer is introduced as an intermediary between the solid boundary and the polymerizing liquid monomer. This liquid layer acts as a mediator that eliminates direct solid-solid contact, thereby reducing stiction forces while maintaining the structural support function of the boundary.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The interface between solid boundary and liquid monomer is changed to a liquid-liquid interface by introducing the inert liquid. This parameter change from solid-liquid to liquid-liquid interface fundamentally alters the interaction forces, eliminating capillary adhesion and stiction effects.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If mechanical separation is used to remove stiction, then polymer can be separated from boundary, but polymer damage occurs

Engineering Contradiction:

Improveseparation capabilityVSAvoidpolymer integrity

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The inert liquid serves as a release agent that prevents strong adhesion between polymer and boundary. This allows easy separation of the polymer from the boundary without requiring mechanical force that could damage the polymer structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The inert liquid layer is positioned beforehand between the polymer and solid boundary to cushion against adhesion forces. This preventive measure ensures that when separation is needed, no damaging mechanical forces are required.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Shape

If solid boundary is used for polymerization, then geometric constraints are maintained, but feature aspect ratios are restricted

Engineering Contradiction:

Improvegeometric constraintsVSAvoidfeature aspect ratios

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

Changing the interface from solid-liquid to liquid-liquid fundamentally alters the boundary conditions for polymerization. The liquid-liquid interface provides different surface energy characteristics and reduced adhesion, enabling formation of features with higher aspect ratios that would be constrained by solid boundary adhesion.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The use of liquid instead of solid at the boundary interface applies hydraulic principles where the liquid layer provides a compliant, non-adhesive boundary that does not mechanically constrain the polymer in the same way a solid boundary does, allowing for more complex geometries.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 reduces stiction forces, allowing for more flexible geometry and continuous polymer formation without mechanical damage, enhancing the capabilities of additive manufacturing for complex 3D object creation.

Implementation Method 1

Methodology Applied

Scientific EffectStiction reduction at liquid-liquid interface:

Implementation Method 2

light from a light source polymerizes the liquid monomer to a solid polymer at a liquid monomer-inert immiscible liquid interface formed between the liquid monomer and the inert immiscible liquid

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS12472685B2Three-dimensional fabrication at inert immiscible liquid interface

Publication Date: 2025.11.18 UNIV OF FLORIDA RESEARCH FOUNDATION INC

AI summary

A method and device of polymerization to form 3D objects is provided. The method and device incorporate an inert immiscible liquid between a liquid monomer and a light source such that the liquid monomer is polymerized when exposed to polymerization light from the light source at a liquid monomer-inert immiscible liquid interface. The liquid monomer is polymerized into a solid polymer that forms the 3D object.