Polymer Analysis Kendrick Mass Defect End Group Identification
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Solution Overview
Problem
Current polymer analysis techniques, such as Kendrick Mass Defect analysis, are unable to accurately identify the mass of the non-primary-chain segment, which includes the end group, crucial for understanding polymer composition and properties.
Innovation Solution
A polymer analysis apparatus and method that processes mass spectra of two polymers with a special relationship, using Kendrick Mass Defect analysis to calculate and compare mass candidates for the non-primary-chain segment, allowing for the identification of its mass and subsequent estimation of the end group composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Kendrick Mass Defect analysis is applied to polymer mass spectrum, then the mass of repeating unit can be determined, but the mass of non-primary-chain segment (end group) cannot be identified
Solution Approach 1:
The polymer mass spectrum is segmented into two distinct components: the primary chain segment (repeating units) and the non-primary-chain segment (end groups). By applying KMD analysis separately to each component, the method enables independent determination of their respective masses. The segmentation allows the end group mass to be isolated and identified without interference from the repeating unit signals.
Solution Approach 2:
The end group mass information is extracted from the total polymer mass spectrum by subtracting the calculated mass of repeating units from the total polymer mass. This extraction process isolates the non-primary-chain segment signal, enabling specific identification of end group composition that was previously obscured in the combined spectrum.
2Ease of operation
If conventional KMD analysis is used, then analysis process is simple, but end group composition cannot be identified
Solution Approach 1:
The method performs preliminary calculation of repeating unit mass and count before determining end group mass. By first establishing the primary chain segment parameters through conventional KMD analysis, the approach creates a foundation that enables subsequent accurate extraction of end group information, maintaining operational simplicity while enhancing analytical capability.
Solution Approach 2:
The repeating unit mass calculation serves as an intermediary step that bridges conventional KMD analysis and end group identification. This intermediate calculation allows the method to leverage existing simple analysis tools while systematically deriving end group composition information that would otherwise require complex specialized techniques.
Data Source
AI summary
A second polymer is prepared through derivatization of a first polymer. Kendrick Mass Defect (KMD) analysis is applied on a mass spectrum of the second polymer, to thereby produce a plot. Meanwhile, a plurality of mass candidates for a non-primary-chain segment are calculated based on a mass spectrum of the first polymer. The KMD analysis is applied on the plurality of mass candidates, to thereby produce reference images. A mass of the non-primary-chain segment is identified through matching of two KMD analysis results.