Using trimethylolpropane triglycidyl ether (TMPGE) as a core molecule

star hydroxyl polyesters (SHPs) were synthesized via the ring-opening reaction of epoxy groups and carboxyl groups. The influence of the categories and molar ratios of raw materials on the properties of SHPs were investigated. The structures and molecular weights of SHPs were characterized with Fourier transform infrared spectrometer (FTIR)

nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). The results showed that the SHPs prepared from oleic acid had the lowest viscosity. IR and 1H NMR spectra indicated that the target SHPs were successfully prepared and possessed similar molecular skeleton structures. The GPC curves displyed that the measured molecular weights of SHPs approached to the theoretical values

and the polydispersity indexes (PDI) of SHPs were in the range of 1.10 to 1.28. The film properties of SHPs cured by the toluene diisocyanate adduct were tested and found that the cured films exhibited excellent adhesion

flexibility and high hardness. Especially

the solution viscosity of SHP-2 was less than 220 mPa·s at 80% solid content and the VOC contents of 2K-PU from SHP-2 was low to 320 g·L-1.