Novel assessment of highly efficient polyamines for post-combustion CO2 capture: Absorption heat, reaction rate, CO2 cyclic capacity, and phase change behavior

•An increase in the proportion “-NH-” functional groups causes lower ΔHabs.•Secondary amino functional groups appear to stimulate the growth of ΔαCO2.•2MPZR has a 10.7% lower ΔHabs than MEA.•The effective phase change solvent, 2MPRZ/TGBE/H2O, was proposed in this work.•The sensible heat of 2MPRZ/TGBE/H2O is 56 % lower than that of 5 M MEA.