Sulfur Concentration Evaluation in Polymer Composites via Dynamic Nuclear Polarization
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Solution Overview
Problem
Existing methods struggle to accurately quantify the concentration of sulfur in polymer composite materials with non-uniform polymer concentrations due to variations in composition throughout the sample.
Innovation Solution
The method employs small-angle neutron scattering combined with 1H dynamic nuclear spin polarization, where a polymer composite material is immersed in a deuterated solvent and subjected to 1H dynamic nuclear spin polarization, allowing for accurate measurement of sulfur concentration without errors from position dependence or degree of swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional neutron scattering methods are used to analyze multicomponent systems, then structural analysis capability is improved, but measurement precision of sulfur concentration deteriorates due to composition variations and swelling effects
Solution Approach 1:
The patent changes the nuclear spin state parameter of protons in the polymer matrix from thermal equilibrium to polarized state through dynamic nuclear polarization. This parameter change creates a binary contrast effect where polarized protons scatter neutrons differently than non-polarized protons, enabling sulfur concentration measurement independent of polymer concentration variations and swelling effects. The scattering intensity becomes directly proportional to sulfur concentration regardless of sample composition variations.
2Measurement precision
If 1H dynamic nuclear polarization is applied to enhance contrast, then measurement precision of sulfur concentration is improved, but device complexity increases due to additional polarization equipment
Solution Approach 1:
The patent replaces conventional mechanical/sample preparation approaches (multiple swelling solvents, manual concentration control) with a physical field-based approach using dynamic nuclear polarization. Instead of mechanically controlling sample composition to achieve contrast, the invention uses microwave irradiation and magnetic fields to polarize nuclear spins, substituting mechanical control with electromagnetic field control. This reduces the need for complex sample preparation equipment while enhancing measurement precision.
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 precise evaluation of sulfur concentration in polymer composite materials, even when sulfur is present in amounts as low as 1% by mass, with a large contrast difference between sulfur and the polymer, ensuring accurate measurement of sulfur concentration levels.
Implementation Method 1
a paramagnetic radical is introduced into a material, and then the material is irradiated with microwaves at an extremely low temperature under a magnetic field to polarize the proton spins in the material
Implementation Method 2
the material is irradiated with microwaves at an extremely low temperature under a magnetic field
Implementation Method 3
the material is irradiated with microwaves at an extremely low temperature under a magnetic field
Implementation Method 4
Contrast variation neutron scattering is a dominant technique for the structural analysis of multicomponent systems
Implementation Method 5
a method of evaluating a concentration of sulfur in a polymer composite material by small-angle neutron scattering with 1H dynamic nuclear spin polarization
Data Source
AI summary
Provided is a method of evaluating a concentration of sulfur in a polymer composite material. The present disclosure relates to a method of evaluating a concentration of sulfur in a polymer composite material by small-angle neutron scattering with 1H dynamic nuclear spin polarization.