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Comprehensive Characterization of Drying Oil Oxidation and Polymerization Using Time-Resolved Infrared Spectroscopy
Gwen DePolo1,2, Piet Iedema2, Kenneth Shull1
1Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.
Macromolecules
|September 16, 2024
Summary
This study reveals how drying oils cure into polymer networks. Lead(II) oxide (PbO) as a catalyst accelerates curing, creating heterogeneous networks and reducing oxidation, especially at lower temperatures.
Area of Science:
- Polymer Chemistry
- Materials Science
- Art Conservation Science
Background:
- Drying oils, like linseed oil, are triglycerides forming polymer networks via free-radical polymerization.
- Understanding oil paint curing is crucial for conservation, linking structure to long-term stability.
Purpose of the Study:
- To investigate drying oil curing behavior under varying conditions.
- To analyze the impact of temperature and lead(II) oxide (PbO) catalyst on oil polymer network formation.
Main Methods:
- Time-resolved Attenuated Total Reflectance Fourier-Transform Infrared (ATR-FTIR) spectroscopy.
- Comprehensive data analysis of five drying oil types.
- Kinetic parameter analysis.
Main Results:
- A phase transition, akin to a gel point, was observed, particularly with PbO, after which curing slowed.
- PbO catalysis resulted in heterogeneous cross-link density and reduced oxidation.
- Lower temperatures favored carboxylic acid group formation in PbO-treated oils.
Conclusions:
- PbO significantly alters drying oil curing kinetics and network structure.
- Curing temperature influences network heterogeneity and oxidation levels.
- Findings provide insights into oil paint aging and conservation strategies.
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