Synthesis and characterization of damping polyurethane derived from poly(neopentyl glycol propoxylated succinic acid)

Poly(neopentyl glycol propoxylated succinic acid) damping polyurethane (PNPS-PU) were synthesized by the reaction of 2,4-tolulene diisocyanate (TDI-100), 3,3′-dichloro-4,4′-diaminodiphenyl methane (MOCA) with polyol. The novel polyol was obtained from neopentyl glycol propoxylated (PONPG) and succinic acid (SA). The structures and properties of PNPS-PU were compared with PPG-PU and PNS-PU, which contained the soft segments of poly(propylene glyol) (PPG) and poly(neopentyl glycol succinic acid) (PNS). The effect of the propoxylated group, neopentyl group and ester group content in the three soft segments on the damping and mechanical properties of PU were studied. The structure of the different soft segments was characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (¹H-NMR) spectroscopy and scanning probe microscope (SPM). Results showed that the maximum loss factor (tan δ_max) of PU was gradually improved with the reduction of propoxylated group content in soft segments and the increase of propoxylated and neopentyl groups. Meanwhile, the glass transition temperature (T _g) increased. The temperature range (tan δ > 0.3) of PNPS-PU was the widest by 69 °C, while the elongation at break of PPG-PU was the maximum. The tensile strength, tear strength, Shore A hardness and thermal stability of PNS-PU were the highest.