Exploring Gel-Point Identification in Epoxy Resin Using Rheology and Unsupervised Learning

Area of Science:

• Polymer Science
• Materials Science
• Chemical Engineering

Background:

• Gel time significantly impacts thermoset resin processing and performance.
• Understanding resin polymerization and viscosity changes with temperature is critical.

Purpose of the Study:

• To compare three experimental techniques for determining the gel point of epoxy resins.
• To investigate the fundamental chemical modifications during resin polymerization.
• To validate the reliability of these techniques using machine learning.

Main Methods:

• Rheological studies using a plate-plate controlled stress rheometer under isothermal conditions.
• Comparison of three distinct experimental methods for gel point determination.
• Application of Principal Component Analysis (PCA) for method validation and pattern identification.

Main Results:

• Successfully identified the gel point for epoxy resins using multiple rheological techniques.
• Observed and analyzed fundamental changes occurring during the polymerization process.
• PCA confirmed the reliability of the experimental methods and highlighted interdependencies between techniques and material properties.

Conclusions:

• The study provides a validated framework for determining epoxy resin gel points.
• Insights into polymerization mechanisms and material property relationships are gained.
• Findings are essential for optimizing industrial resin-based processes.