02410nas a2200289   4500008004100000022001400041245010600055210006900161260000900230300001200239490000700251520145900258653001901717653001301736653002201749653002601771653001801797100001801815700002001833700003001853700001901883700002301902700001701925700002601942700002701968856012501995       2026                        eng d  a1060-132500aDesign, synthesis, and adhesive performance evaluation of DOPA-Functionalized polyurethane elastomers0 aDesign synthesis and adhesive performance evaluation of DOPAFunc  cJUN   a482-4920 v633 a<p>
	Functional polyurethane (PU) hot-melt adhesives were developed through the incorporation of a dopamine-derived chain extender (DADO) into thermoplastic PUs. The DADO monomer was synthesized via a four-step route and successfully integrated into the PU backbone using a one-pot, two-step polymerization involving polycaprolactone-diol and 4,4 `-methylenebis(phenyl isocyanate). Spectral analyses confirmed the formation of urethane linkages and the effective incorporation of catechol moieties. Monomodal molecular weight distributions were obtained through size-exclusion chromatography with Mn ranging from 12,000 to 17,000 g/mol. Thermal analyses demonstrated two-step decomposition behavior and a progressive increase in glass transition temperature with increasing DADO content. Mechanical testing revealed that there was substantial improvement in the tensile strength of these materials from 1.34 MPa for unmodified PU (PU-0) to 14.3 MPa for PU-10. Adhesion performance exhibited a similar trend, with PU-10 attaining the highest lap-shear strength of 3.92 +/- 0.19 MPa on the Al substrate. PU-10 exhibited the highest lap-shear strength of 3.92 +/- 0.19 MPa on aluminum and superior underwater stability with a value of 2.78 +/- 0.47 MPa compared to other formulations. Overall, controlled incorporation of DADO significantly enhances properties, and PU-10 represents the optimal formulation for high-performance hot-melt PU adhesives.</p>
10achain extender10adopamine10ahot-melt adhesive10apolycaprolactone diol10apolyurethanes1 aDavis, Disiya1 aAlam, Md, Shafi1 aBindu, Bhadra, Purushotha1 aLakshmi, Durga1 aMuhammed, Hasin, N1 aTorris, Arun1 aAmbade, Ashootosh, V.1 aNair, Kiran, Sukumaran  uhttps://library.ncl.res.in/content/design-synthesis-and-adhesive-performance-evaluation-dopa-functionalized-polyurethane