Cure kinetics and thermal property of UV-curable polyester nanocomposites coating modified with MAP-POSS

摘要

The UV-curable unsaturated polyester (UPR) was modified with glycidyl methacrylate and methylacryloylpropyl polyhedral oligomeric silsesquioxanes (MAP-POSS), and the cure kinetics of MAP-POSS/UPR system was investigated by non-isothermal DSC. The result shows that UPR, glycidyl methacrylate and MAP-POSS have very good compatibility and can co-cure in free radical polymerization. The curing reaction can be described by a two-parameter autocatalytic Sestak-Berggren (S-B) model. The average reaction activation energy E_a for 6% and 9% MAP-POSS content is 73 kJ/mol and is lower than 0% (about 82 kJ/mol). The mechanical loss peak temperature T_p of curing nanocomposites increase with increasing MAP-POSS content and has a highest value when MAP-POSS content is 9%, which is 114.1°C and higher about 12°C than pure UPR.