Quantitative analysis of polymer additives with MALDI-TOF MS using an internal standard approach

Area of Science:

• Analytical Chemistry
• Polymer Science
• Materials Science

Background:

• Polymer additives require accurate analysis for quality control and performance.
• Traditional methods for analyzing polymer additives often involve complex and time-consuming sample pretreatment.
• Direct analysis methods are highly desirable to streamline the process.

Purpose of the Study:

• To develop and validate a direct qualitative and quantitative analysis method for polymer additives using MALDI-TOF MS.
• To eliminate the need for tedious sample preparation steps.
• To establish a reliable method for quantifying specific polymer additives directly from the polymer matrix.

Main Methods:

• Utilized Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS).
• Employed a solid sample preparation technique to avoid concentration gradient issues.
• Incorporated tetraphenylporphyrine as an internal standard for quantitative analysis.

Main Results:

• Successfully performed qualitative analysis of seven different polymer additives directly from polymer samples.
• Achieved quantitative analysis of additives with high accuracy, avoiding common sample preparation pitfalls.
• Generated calibration curves for six common additives (Tinuvin 770, Tinuvin 622, Irganox 1024, Irganox 1010, Irgafos 168, and Chimassorb 944) with coefficients of determination ranging from 0.911 to 0.990.

Conclusions:

• MALDI-TOF MS is a powerful tool for the direct qualitative and quantitative analysis of polymer additives.
• The developed solid sample preparation technique and use of an internal standard significantly improve the accuracy and efficiency of additive quantification.
• This method offers a simplified and effective approach for polymer additive analysis in research and industry.