7Krol P,Wojturska J, Kinetic. Study on the reaction of 2,4 - and 2,6 - tolylene diisocyanate with 1 - butanol in the presence of styrene, as a model reaction for the process that yields interpenetrating polyurethane- polyester net- works [J]. J Appl Polym Sci,2003,88:327 - 336.
8Zhang J, Hu CP. Synthesis, characterization and mechani- cal properties of polyester - based aliphatic polyurethane elastomers containing hyperbranched polyester segments [ J]. Eur Polym J,2008,44:3708 - 3714.
10Heintz AM, Duffy DJ, Hsu SL, et al. Effects of reaction temperature on the formation of polyurethane prepolymer structures [ J ]. Macromolecules ,2003,36:2695 - 2704.