Cure Monitoring and Crosslink Verification
topic
Coating cure completeness verification uses FTIR spectroscopy comparing the ratio of reactive group absorption bands before and after curing to calculate reaction conversion percentage, dynamic mechanical analysis measuring storage modulus and glass transition temperature that confirm crosslink density development, and solvent extraction testing measuring the percentage of soluble uncrosslinked polymer that would indicate incomplete cure in production samples.
Role
Verifies that chemical crosslinking reactions have proceeded to the required degree of completion that develops the target coating properties of solvent resistance, hardness, adhesion, and durability, with cure verification being essential for quality assurance of thermoset and radiation-cured coatings where under-cure produces coatings that fail performance specifications without the obvious visual indication that guides process correction in thermal drying operations.