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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.\par \par 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.\par \par 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.\par \par 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.\par \par 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.\par \par 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.\par \par 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.\par \par 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.\par \par 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.\par \par }