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Three-Dimensional Fluorescent Imaging to Identify Multi-Paths in Polymer Aging.

Zekun Zhang¹, Rui Tian¹, Daolei Lin¹

¹State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

Analytical Chemistry

|July 16, 2021

Summary

This summary is machine-generated.

This study visualizes polymer aging pathways using fluorescent probes. It reveals how humidity and oxygen content influence polyimide degradation, enabling better material lifespan prediction and control.

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Area of Science:

Polymer Science
Materials Chemistry
Analytical Chemistry

Background:

Current polymer aging studies lack spatiotemporal resolution, hindering the distinction of multiple degradation pathways.
Understanding diverse aging mechanisms is crucial for predicting and controlling polymer evolution under various environmental factors.

Purpose of the Study:

To develop a method for visualizing and distinguishing multiple polymer aging pathways simultaneously.
To investigate the influence of hydrothermal treatment on polyimide aging mechanisms.

Main Methods:

Utilized specific fluorescent probes to label hydroxyl, carboxyl, and amino groups during polyimide aging via boron-oxygen, imine, and thiourea linkages.
Employed controlled excitation and emission wavelengths to visualize aging pathways in 3D fluorescent images.
Analyzed the impact of humidity and oxygen content on pyrolysis and hydrolysis pathways.

Main Results:

Successfully visualized individual and simultaneous multi-paths in polyimide aging using 3D fluorescent imaging.
Destructured hydrothermal aging into distinct pyrolysis and hydrolysis pathways.
Discovered that increased humidity and decreased oxygen accelerate hydrolysis and hinder pyrolysis, leading to severe polyimide degradation.
Quantified that oxygen has a greater regulatory effect on pyrolysis than water vapor on hydrolysis.

Conclusions:

Developed a multidimensional identification methodology for polymer aging pathways.
Demonstrated that tuning oxygen and water vapor content can guide polymer aging towards less harmful outcomes.
Provides insights for enhancing the long-term use and controlled degradation of polymers.