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Related Experiment Video

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Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

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Quantification of Polymer Surface Degradation Using Fluorescence Spectroscopy.

Jonathan M Tigner¹, Margaret M Elmer-Dixon², Melissa A Maurer-Jones¹

¹Department of Chemistry and Biochemistry, University of Minnesota Duluth, 1038 University Drive, Duluth, Minnesota 55812, United States.

Analytical Chemistry

|June 16, 2023

Summary

This study introduces a new, inexpensive method using Nile red fluorescence to detect early-stage plastic degradation in polyethylene and polypropylene. This technique aids in optimizing plastic reuse and recycling by monitoring material health.

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Area of Science:

Materials Science
Environmental Science
Analytical Chemistry

Background:

Plastic pollution is a significant environmental concern, necessitating improved recycling and reuse strategies.
Current methods for monitoring plastic degradation are insufficient for detecting early-stage changes, hindering effective material management.
Early detection of degradation is crucial for optimizing the reusability of plastics like polyethylene (PE) and polypropylene (PP).

Purpose of the Study:

To develop an inexpensive, reproducible, and nondestructive technique for monitoring the degradation of PE and PP.
To utilize Nile red as a fluorescent probe to assess plastic material health.
To correlate fluorescence changes with established methods of plastic degradation analysis.

Main Methods:

Exposure of aged PE and PP samples to Nile red fluorescent probe.
Measurement of changes in Nile red's fluorescence spectra.
Correlation of fluorescence spectral shifts with carbonyl index (infrared spectroscopy) and bulk crystallinity (calorimetry).

Main Results:

Nile red fluorescence spectra showed distinct shifts correlating with plastic degradation.
A decrease in surface hydrophobicity of plastics led to a shift in Nile red's signal to longer wavelengths.
The observed fluorescence trends aligned with chemical and physical changes in the plastics, irrespective of film thickness but dependent on polymer type.

Conclusions:

Developed a novel fluorescence-based technique for assessing plastic degradation, including early stages.
The method provides a valuable tool for evaluating the extent of degradation in PE and PP.
This technique has the potential to improve plastic recovery rates and contribute to minimizing plastic waste.