Chemical Fingerprinting of Synthetic Polymers via Direct Insertion Probe Mass Spectrometry

Area of Science:

• Analytical Chemistry
• Polymer Science
• Materials Science

Background:

• Synthetic polymers are ubiquitous in modern life.
• Accurate identification of polymer types is crucial for recycling and environmental monitoring.
• Existing analytical methods may require extensive sample preparation.

Purpose of the Study:

• To establish a spectral library for chemical fingerprinting of synthetic polymers.
• To evaluate the efficacy of temperature-programmed Direct Insertion Probe Mass Spectrometry with Atmospheric Pressure Chemical Ionization (DIP-APCI-MS) for polymer identification.
• To demonstrate the method's applicability to a wide range of polymer classes.

Main Methods:

• Analysis of 38 different polymers using temperature-programmed DIP-APCI-MS.
• Development of a comprehensive spectral library based on thermal decomposition patterns.
• Minimal sample preparation was employed.

Main Results:

• DIP-APCI-MS provided detailed structural information for reliable polymer identification.
• Characteristic thermal decomposition patterns were observed for various polymer classes.
• Temperature programming facilitated monitoring of sample degradation and aided identification.

Conclusions:

• Temperature-programmed DIP-APCI-MS is a robust and efficient method for synthetic polymer chemical fingerprinting.
• The method enables accurate identification of diverse polymers.
• Potential applications include microplastic analysis and plastic recycling.