Abstract
Bi-soft segment isocyanate-terminated polyurethanes (ITPUs) currently play a major role in the industrial production of high performance polyurethanes (adhesives, coating, foams, thermoplastics, nanoparticles, dispersion). The present contribution reports on the investigation of liquid-liquid demixing phenomena during the synthesis of bi-soft segment ITPUs. For this purpose, a dedicated experimental setup based on coupled in-line reaction monitoring via UV/Vis and FTIR technique was developed. It was used to monitor phase separation and reaction progress in the course of a prepolymerization using 1,6-hexamethylene diisocyanate and a polyether polyol mixture. Such phenomena may have a great impact on reaction kinetics and product quality. Furthermore, in-line FTIR analysis appeared to be sensitive to phase separation processes in the way that it predominantly detects the continuous phase rather than the dispersed droplets.
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Acknowledgments: This study was not supported by any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. The authors gratefully acknowledge Covestro Deutschland AG, Leverkusen for the supply of the chemicals and in particular Dr. Dirk Achten and Dr. Dirk Dijkstra for their helpful discussion.
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Wenning, C., Noe, J., Barbe, S. et al. Evidence of Liquid-Liquid Demixing During Bi-Soft Segment Polyurethane Prepolymerization. Macromol. Res. 26, 395–398 (2018). https://doi.org/10.1007/s13233-018-6065-5
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DOI: https://doi.org/10.1007/s13233-018-6065-5