Aysun Altan, Hande Ergin Esen, Meral Arca and Emin Arca
J. Chem. Res. Adv., 03 (01):15-20
Aysun Altan : Caran Kimya San. ve Tic. Ltd. Şti.
Hande Ergin Esen : Biruni University
Meral Arca : Caran Kimya San. ve Tic. Ltd. Şti.
Emin Arca : Marmara University
Aim: This study was aimed to investigate effect of catalyst type on curing behavior, morphology, mechanical and surface properties of a moisture curing polyurethane (MCPU) prepolymer.
Method and Materials: The prepolymer was prepared by the reaction of polypropylene glycol and methylene diphenyl diisocyanate (MDI). It was cured using 2-Dimorpholinodiethylether (DMDEE) and Dibutyltindilaurate (DBTL) at 25°C, and relative humidity of 45%. Fourier transform infrared spectroscopy (FTIR) was used to monitor the curing rate. Morphology of the MCPU was evaluated by tapping mode Atomic Force Microscopy (AFM). The results showed that the orientation of hard segments within the matrix of soft segments was influenced by the choice of curing catalyst.
Results: The effect of the catalyst on surface properties was analyzed by contact angle measurements and surface free energy (SFE) calculations. Elongation, tensile strength and elastic modulus measurements were performed in order to analyze the mechanical properties.
Conclusion: It was concluded that surface free energy and mechanical properties of MCPU differentiate depending on the type of curing catalyst.