Surface-Grafted HIPE Foam Stationary Phases for Faster Separations

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Solution Overview

Problem

The use of polymeric resin beads for chemical separations is inefficient due to slow diffusion rates and underutilization of internal surface area, leading to overlapping elution curves and increased pressure drops, which decreases the efficiency of liquid chromatography separations.

Innovation Solution

A high internal phase emulsion foam is formed by incorporating a functionalized co-monomer with a nitroxide-mediated polymerization agent, followed by grafting a monomer from its surface, creating a stationary phase for liquid chromatography that enhances adsorption and elution characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If polymeric resin beads are used for chemical separations, then solute adsorption can be achieved, but diffusion is slow causing overlapping elution curves and difficult separations

Engineering Contradiction:

Improveseparation efficiencyVSAvoiddiffusion rate

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent uses high internal phase emulsion (HIPE) foams with controlled porosity and interconnected pore structures to enable faster mass transport. The porous foam architecture provides numerous pathways for solute diffusion while maintaining high surface area, resolving the contradiction between separation efficiency and diffusion speed by replacing traditional bead pores with an open foam network.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The invention creates composite stationary phases by combining HIPE foam matrices with grafted functional polymers. The foam provides the structural framework for fast transport, while the grafted polymer layers provide adsorption functionality, achieving both rapid diffusion and effective separation in a single composite material system.

Inventive Principle:

Principle #40Composite materials

2Area of stationary object

If smaller resin beads are used to increase surface area, then more surface area is available for solute sorption, but pressure drops increase and throughput rates decrease

Engineering Contradiction:

Improvesurface area for sorptionVSAvoidpressure drop

Core Design Contradiction:

Area of stationary objectVSStress or pressure

Solution Approach 1:

The HIPE foam structure provides high internal surface area through its three-dimensional network of pores and struts. This porous architecture delivers extensive sorption surface area without requiring small particle sizes, thereby maintaining low pressure drops and high throughput rates while achieving large effective surface area for solute interaction.

Inventive Principle:

Principle #31Porous materials

3Measurement precision

If polymeric resin beads are used, then solute adsorption occurs primarily on the surface, but the center is not utilized decreasing chromatography efficiency

Engineering Contradiction:

Improvechromatography efficiencyVSAvoidutilization of stationary phase

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The open-cell foam structure of the HIPE provides贯穿 the entire volume of the stationary phase, allowing solute access to adsorption sites throughout the bulk material rather than just at the external surface. This three-dimensional porous network enables efficient utilization of the entire stationary phase volume for solute adsorption.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The invention embeds functional polymer chains within the foam matrix structure and on the foam struts. This nested arrangement places adsorption-active material throughout the internal volume of the stationary phase, maximizing the utilization of the entire bead volume for solute interaction rather than just the external surface.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

The surface-grafted high internal phase emulsion foam exhibits improved adsorption capacity and efficient elution, allowing for higher material uptake and reduced solvent usage compared to polymeric resin beads.

Implementation Method 1

grafting a monomer from a surface of the high internal phase emulsion foam, wherein the nitroxide-mediated polymerization agent controls polymerization of the monomer

Methodology Applied

Scientific EffectNitroxide-mediated polymerization:

Implementation Method 2

The polymer-grafted foam exhibits improved adsorption capacity and efficient elution, allowing for higher material uptake

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS12403451B2Surface grafted high internal phase emulsion foams for chemical separations

Publication Date: 2025.09.02 BATTELLE SAVANNAH RIVER ALLIANCE LLC

AI summary

A method of forming a high internal phase emulsion (HIPE) foam is provided. A nitroxide-containing monomer can be used in combination with other monomers that can then be used to make a high internal phase emulsion foam upon curing. The nitroxide group can subsequently be used to control the radical polymerization of many monomers, which can be grafted from the surface of the high internal phase emulsion foam. The resulting foam can be useful in performing separations of radioactive species, metals, metal ions, multi-element ions, metal complexes, halides, and organic chemical species in chemical process streams, clean-up operations, etc.