The role of the soft phase in the hardening effect and the rate dependence of the ultimate physico-mechanical properties of urethane-containing segmented elastomers

Frost-Resistant Epoxy-Urethane Binders Containing Diglycidyl Urethane

“…This effect was observed in the experiment for samples cured with IFDA (increase in the current modulus value in the last stages of strain-stress plots). It is interesting that similar effects were observed earlier for polyurethane ureas when using isophorone diisocyanate in the synthesis [34]. International Journal of Polymer Science…”

The effect of plasticization on the properties of poly(urethaneureas) based on oligoether diols, 2,4-toluenediisocyanate, and aromatic diamines

“…The bands at 1690-1693 cm À1 in the spectra of poly(urethaneurea) are for the absorption of hydrogen-bonded ordered carbonyl groups in urethanes and of free urea carbonyl. 14,27,28,31 The band at 1710-1714 cm À1 is assigned to the absorption of hydrogen-bonded ordered urethane carbonyl in the soft phase of the polymer, and the band at 1730-1738 cm À1 is assigned to the absorption of free carbonyl in the same phase. 5,26,28,30,31 The analyzed FTIR spectra of SPUU samples with soft polytetramethyleneoxide segments (M n % 2000 g mol À1 ) showed band intensity at 1634 cm À1 (SPUUE-3) or at 1640 cm À1 (SPUUM-3) that did not change in a wide interval of DEHS concentrations.…”

Toolbox for optimizing anti‐erosion protective coatings of wind turbine blades: Overview of mechanisms and technical solutions

“…Other structural factors influencing the damping mechanisms and mechanical properties of PUs are discussed in previous studies …”

“…24 Further, the content and properties of soft phase are assumed to determine the damping properties of the PUs. [38][39][40][41][42][43][44] According to the measurements in Sain et al, 44 tan δ (mechanical loss coefficient) increases drastically with increasing the percentages of soft segment content (W): from e-0.08 to 0.01 (at soft segment content 27%) to approximately 0.5 to 1.0 at soft segment content 42% to 1.5 to 1.6 at soft segment content 48%.…”

“…44 Other structural factors influencing the damping mechanisms and mechanical properties of PUs are discussed in previous studies. 38,42,43 Arena et al 16 studied TPUs with various arrangements of hard and soft segments, using erosion and abrasion tests and viscoelastic analysis.…”