Xl. Luo et al., THE STUDY ON THE CHAIN EXTENSION REACTION OF MDI AND TDI TERMINATED POLYESTER PREPOLYMERS WITH EXTENDERS, Gaodeng xuexiao huaxue xuebao, 16(5), 1995, pp. 799-803
The effects of the hard segment structure on the chain extension react
ion kinetics of MDI or TDI terminated PEPA-prepolymer with diamine(MOC
A) and polyol(TMP) have been studied by FTIR method systematically, Th
e reaction fate constants and activation energy for these systems have
been measured. The chain extension reactions in these systems are fou
nd to be reactions of second order, The chain extension reaction of NC
O terminated PEPA-MDI-prepolymer with MOCA or TMP is faster than that
of PEPA-TDI-prepolymer with the same extenders, The activation energy
of the chain extension reaction of NCO terminated PEPA-prepolymer with
MOCA is much lower than that with TMP, Such chain extension reaction
difference has been discussed.