Effect of Pyridazine Content and Crosslinker Structure on the Properties of Polyurethane Elastomers

摘要

This article studies the development of a series of heterocyclic polyurethanes (PUs) with various pyridazine content and different crosslinker structure in their main chains. All of the isocyanate-terminated PU prepolymers were prepared from poly(tetramethylene oxide) glycol of molecular weight 1400 (Terathane 1400) and 1,6-hexamethylene diisocyanate. The properties of the obtained linear and crosslinked pyridazine-based PU were compared with the properties of common PUs obtained by chain extension with 1,4-butanediol. All the obtained PUs were characterized through spectral and thermal behavior. The pyridazine-based PU showed improved thermal stability with 10% weight loss at temperatures above 370-400℃. With the increase of pyridazine content the values of Young's modulus are higher and the strain at break decreases. Increasing pyridazine content leads to increased films surface hydrophilicity.