STUDY ON SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE CONTAINING SILVER NITRATE

In this study, the polycaprolactone diol (PCL), 4,4’-diphenylmethane diisocyanate (MDI) and 2,6-Pyridimthanol (2,6-PDM) were reacted in the N,N-dimethyl acetamid (DMAc) solvent to form the polyurethane (PU). Finally, the silver nitrate was added into the polyurethane. The silver ion was reacted with 2,6-Pyridimthanol to form the metal coordinate bond in PU/AgNO3. Various addition ratios of silver nitrate were studied to understand the influence on the properties of polyurethane containing the pyridine ring. The characteristic peak was identified to determine the structure of polyurethane. The residue of thermal decomposition could be used to determine the addition of silver nitrate, and the variation of degradation temperature could be observed. When the content of silver nitrate was increased, the glass transition temperature (Tg) would be increased significantly. The stress-strain test showed that when the content of silver nitrate was increased, the elongation at break of PU/AgNO3 would be reduced significantly. The NaOH aqueous solution was used to decompose PU/AgNO3, and the degradation rate of PU/AgNO3 was observed in a short time. The scanning electron microscope (SEM) was used to observe the pore and crack of PU/AgNO3 after hydrolytic reaction.