Atmospheric solid analysis probe-ion mobility mass spectrometry of polypropylene

Area of Science:

• Materials Science
• Analytical Chemistry
• Polymer Science

Background:

• Polyolefins, particularly polypropylene (PP), are crucial materials with growing importance in plastic waste recycling.
• Effective recycling necessitates thorough characterization of PP materials, including their polymer and additive components, and understanding degradation mechanisms.
• Traditional mass spectrometry methods for PP characterization often require sample preparation, such as pyrolysis, to generate ionizable species.

Purpose of the Study:

• To extend the application of atmospheric solid analysis probe (ASAP) coupled with traveling wave ion mobility mass spectrometry (TWIM-MS) for comprehensive PP material characterization.
• To analyze both the polymer matrix and additives in various commercial PP samples, from standards to end-use plastic items.
• To elucidate the role of additives in the degradation of polypropylene materials.

Main Methods:

• Utilized atmospheric solid analysis probe (ASAP) for direct analysis of PP samples with no prior preparation.
• Employed traveling wave ion mobility mass spectrometry (TWIM-MS) to achieve separation of polymer ions and additive signals.
• Conducted accurate mass measurements and tandem mass spectrometry experiments to support additive characterization.

Main Results:

• ASAP-TWIM-MS enabled direct analysis of PP materials, yielding polymer pyrolysis residues similar to those from classic pyrolysis.
• Achieved clear separation between polymer-derived ions and signals from various additives.
• Successfully characterized additives, confirming their presence and potential influence on material properties and degradation.

Conclusions:

• The developed ASAP-TWIM-MS strategy offers a direct and efficient method for characterizing polypropylene materials and their additives.
• This technique facilitates a deeper understanding of polymer degradation mechanisms by highlighting the role of additives.
• The findings support advancements in plastic waste characterization and recycling by providing detailed insights into material composition.