Synthesis of Isosorbide-Based Polyurethane for Moisture Barrier Film with Different Polyols and Soft-Hard Segments Ratio
발표자
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초록
내용
A series of isosorbide-based thermoplastic polyurethanes (TPUs) with different soft/hard ratios but the similar molecular weight were successfully synthesized by step-polymerization using two types of polyols. polycaprolactone diol (PCL) or poly (tetramethylene glycol) (PTMG), and methylene diphenyl diisocyanate (MDI) as the soft segment, and bio-based material isosorbide (ISB) for chain extender and MDI as hard segments. The ratio of soft/hard segments consisted of weight fractions of 6/4 and 9/1, respectively. The structure of the polyurethane series was analyzed by fourier transform infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC). The thermal properties were analyzed by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TPUs films with high hard segment ratios indicated lower water vapor permeability. Although hydrophilic isosorbide was used in polyurethane, water vapor permeability could be adjusted by structural differences.