Polymer Raman Peak Separation for Crystallinity and Oxidation
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Solution Overview
Problem
Existing methods for calculating physical property values of polymer materials using Raman spectroscopy are inaccurate due to baseline slopes caused by fluorescence or ambient light, particularly affecting the peak used for calculating crystallinity and oxidation level, leading to errors in the calculated values.
Innovation Solution
A method that separates overlapping peaks in the Raman spectrum using a fitting function to calculate the degree of crystallinity and oxidation level based on the areas of specific peaks (P1, P2, and P7) that are less influenced by baseline slopes, eliminating the need for peak P4, which is prone to errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If peak area P4 is used to calculate physical property values, then the calculation method is simple, but measurement precision deteriorates when baseline slope is present
Solution Approach 1:
The patent segments the superimposed peak into multiple component peaks (crystalline CH2 twisting vibration peak, amorphous CH2 twisting vibration peak, and crystalline CH2 bending vibration peak) using peak separation technology. This allows accurate measurement of individual peak areas even when baseline slopes are present, resolving the contradiction between calculation simplicity and measurement precision by replacing the single peak area method with a multi-peak separation approach.
2Device complexity
If peak P4 is used for calculation, then fewer peaks are needed, but reliability deteriorates due to baseline slope influence
Solution Approach 1:
The patent applies local quality by selecting specific peaks (P1, P2, and P7) that are less influenced by baseline slopes for the calculation of physical property values. Instead of using any peak, the method specifically chooses peaks with characteristics that make them more reliable under baseline slope conditions, thereby improving reliability while maintaining reasonable complexity.
3Loss of time
If traditional peak area method is used, then measurement process is quick, but measurement precision deteriorates due to baseline slope
Solution Approach 1:
The patent performs preliminary peak separation and baseline correction before calculating physical property values. By pre-processing the Raman spectrum to separate overlapping peaks and correct baseline slopes in advance, the method enables accurate measurements without significantly increasing total measurement time, thus resolving the contradiction between speed and 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
Enables accurate calculation of physical property values, such as crystallinity and oxidation level, even when baseline slopes are present, reducing variations across different measurement devices and minimizing errors caused by chromatic aberration and spectral sensitivity differences.
Implementation Method 1
measuring a Raman spectrum of a polymer material such as polyethylene
Data Source
AI summary
A physical property value calculation device includes at least one processor configured to: separate a superimposed peak into an estimated main peak corresponding to a main peak and an estimated sub-peak corresponding to a sub-peak, by applying a predetermined fitting function to each of the main peak and the sub-peak; calculate a main intensity index value indicating an intensity of the estimated main peak and a sub-intensity index value indicating an intensity of the estimated sub-peak; and calculate a physical property value of the polymer material based on the main intensity index value and the sub-intensity index value.