Synthesis of L-Lactide-Based Segmented Polyurethanes

ABSTRACT

A series of segmented polyurethanes with polylactidediols soft segments and methylene-diphenyl-diisocyanate/1,4-butanediol hard segments with molecular weights in the range of 6.18 × 10³ to 9.36 × 10³ Da were synthesized. Stannous octoate was the catalyst for the reactions. These polymers were characterized using Fourier transform infrared spectroscopy, X-ray diffraction, gel permeation chromatography, and thermogravimetric analyzer. Fourier transform infrared analyses revealed the formation of urethane groups and complete curing of polyurethane. The thermal degradation temperatures were in the range of 248.55–257.09°C. X-ray diffraction studies confirmed the segmented structure of polyurethanes.

GRAPHICAL ABSTRACT

KEYWORDS:

• FTIR
• polylactide diols
• polyurethanes
• TGA
• XRD

Acknowledgments

The authors are highly thankful to Dr. Manohar V. Badiger, Principal Scientist, National Chemical Laboratory (NCL), Pune for providing his kind support in characterization of samples.