T.  Ranganathan, Gowd, E. B., Ramesh, C., and Kumar, A., ?Main chain thermotropic liquid crystalline polyurethanes containing biphenyl mesogens based on novel AB-type self-polycondensation route: FT-IR and XRD studies?, Journal of Polymer Science Part A-Polymer Chemistry, vol. 43, no. 9, pp. 1903-1912, 2005.

R.  Srivastava, Srinivas, D., and Ratnasamy, P., ?Syntheses of polycarbonate and polyurethane precursors utilizing CO2 over highly efficient, solid as-synthesized MCM-41 catalyst?, Tetrahedron Letters, vol. 47, no. 25, pp. 4213-4217, 2006.

A. V.  Raghu, Gadaginamath, G. S., Jawalkar, S. S., Halligudi, S. B., and Aminabhavi, T. A., ?Synthesis, characterization, and molecular modeling studies of novel polyurethanes based on 2,2 '-[ethane-1,2-diylbis(nitrilomethylylidene)]diphenol and 2,2 '-[hexane-1,6-diylbis(nitrilomethylylidene)]diphenol hard segments?, Journal of Polymer Science Part A-Polymer Chemistry, vol. 44, no. 20, pp. 6032-6046, 2006.

A. V.  Raghu, Gadaginamath, G. S., Mathew, N. T., Halligudi, S. B., and Aminabhavi, T. M., ?Synthesis and characterization of novel polyurethanes based on 4,4 `-[1,4-phenylenedi-diazene-2,1-dlyl] bis(2-carboxyphenol) and 4,4 `-[1,4-phenylenedi-diazene-2,1-diyl] bis(2-chlorophenol) hard segments?, Reactive & Functional Polymers, vol. 67, no. 6, pp. 503-514, 2007.

A. V.  Raghu, Gadaginamath, G. S., Mathew, N. T., Halligudi, S. B., and Aminabhavi, T. M., ?Synthesis, characterization, and acoustic properties of new soluble polyurethanes based on 2,2 `-[1,4-phenylenebis(nitrilomethylylidene)diphenol and 2,2 `-[4,4 `-methylene-di-2-methylphenylene-1,1 `-bis(nitrilomethylylidene)]diphenol?, Journal of Applied Polymer Science, vol. 106, no. 1, pp. 299-308, 2007.

P.  Deepa and Jayakannan, M., ?Solvent-free and nonisocyanate melt transurethane reaction for aliphatic polyurethanes and mechanistic aspects?, Journal of Polymer Science Part A-Polymer Chemistry, vol. 46, no. 7, pp. 2445-2458, 2008.

N.  Rekha and Asha, S. K., ?Solvent-induced self-assembly in cardanol-based urethane methacrylate comb polymers?, Journal of Polymer Science Part A-Polymer Chemistry, vol. 47, no. 12, pp. 2996-3009, 2009.

A. V.  Raghu, Gadaginamath, G. S., Jeong, H. Mo, Mathew, N. T., Halligudi, S. B., and Aminabhavi, T. M., ?Synthesis and characterization of novel schiff base polyurethanes?, Journal of Applied Polymer Science, vol. 113, no. 5, pp. 2747-2754, 2009.

K.  Garg, Chatterjee, D., and Wadgaonkar, P., ?Clickable polyurethanes based on s- triazine ring containing aromatic diisocyanate bearing pendent alkyne group: synthesis and postmodification?, Journal of Polymer Science Part A Polymer Chemistry, vol. 55, no. 6, pp. 1008-1020, 2017.