How does polyurethane prepolymer (PUP) modify asphalt?

Label:chem

Topic
PUP is a low molecular weight polymer prepared from isocyanates and polyols, which can react with chain extenders to form polyurethane. The highly active –NCO groups at both ends of PUP enable chemical modification of asphalt.

From: "Application of isocyanate-based materials in asphalt pavement: A review", Journal of Road Engineering, Volume 5, Issue 2, June 2025, Pages 261-278
Answer
PUP modifies asphalt by forming a three-dimensional polymer network with the hydroxyl and amino groups in asphalt, improving its high-temperature performance. The curing process can further enhance the performance of the modified asphalt over time.
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