Abstract
Well-defined α-(cyclic carbonate), ω-hydroxyl asymmetric telechelic poly(ε-caprolactone)s (PCLs) were prepared with good end-group fidelity by ring-opening polymerization (ROP) of ε-CL catalyzed by Sn(Oct)2 in conjunction with a renewable, functional bio-based initiator namely glycerol 1,2-carbonate (GC) in bulk at 110 °C. The end group’s structure derived from the alcohol initiator was confirmed by NMR, FTIR and MALDI TOF MS. The living character of ROP of ε-CL using GC/Sn(Oct)2 was demonstrated by the linear correlation of molecular weight versus monomer conversion. End-cap** reaction of α-(cyclic carbonate), ω-hydroxyl asymmetric telechelic PCL with itaconic anhydride to yield α-(cyclic carbonate), ω-(itaconic acid) asymmetric telechelic PCL was presented. Five-membered cyclic carbonate end group reaction with 2-phenylethylamine enabled the hydroxyurethane end functional PCL without the use of the relatively more hazardous isocyanates and without any by-product.
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Acknowledgments
Ravindra Mahadev Patil would like to thank Syngene International Ltd, Bangalore, India for financial assistance for his doctoral research.
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Patil, R.M., Hong, H., Chai, C.L.L. et al. Synthesis and characterization of α-(cyclic carbonate), ω-hydroxyl/itaconic acid asymmetric telechelic poly(ε-caprolactone). Polym. Bull. 72, 2489–2501 (2015). https://doi.org/10.1007/s00289-015-1413-5
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DOI: https://doi.org/10.1007/s00289-015-1413-5