| 초록 |
Bio-based polyurethanes (bio-PU) from 4,4'-methylene diphenyl diisocyanate, poly (tetramethylene ether glycol), and isosorbide (ISB) were successfully synthesized with respect to polymerization conditions. Compared to conventional chain extender, 1,4-butanediol, the ISB exhibited lower reactivity due to asymmetric chemical structure. In this regard, we explored the effects of the three parameters including the amount of catalyst and solvent, and polymerization temperature on molecular weight (MW) and physical properties of bio-PUs to optimize their synthetic conditions. The MW, chemical structure, and physical properties of the synthesized bio-PUs were evaluated using NMR, FT-IR, DSC, rheology, and tensile characterization. Among various preparation methods, interestingly, desirable bio-PUs with the highest MW and related mechanical strength were obtained by a solvent- and catalyst free condition. |
