The Study on the Chain Extension Reaction of MDI and TDIT erminated Polyester Prepolymers with Extenders

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (5): 799.

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The Study on the Chain Extension Reaction of MDI and TDIT erminated Polyester Prepolymers with Extenders

LUO Xiao-Lie, LIU Jin, HU Ke-Liang, MA De-Zhu

Department of Materials Science and Engineering. Academia Sinica Structure Research Laboratory, University of Science and Technology of China, Hefei, 230026

Received:1994-09-14 Revised:1995-01-23 Online:1995-05-24 Published:1995-05-24

Abstract

Abstract: The effects of the hard segment structure on the chain extension reaction kinetics of MDIor TDIterminated PEPA-prepolymer with diamine(MOCA) and polyol(TMP) have been studied by FTIR method systematically. The reaction rate constants and activation en ergy for these systems have been measured. The chain extension reactions in these systems are found to be reactions of second order. The chain extension reaction of NCOterminated 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 NCOter minated PEPA-prepolymer with MOCA is much lower than that with TMP.Such chain ex tension reaetion difference has been discussed.

Key words: Hard segment structure, Polyester-polyurethane, Chain extension reaction, Rate constant, Activation energy

CLC Number:

O633.14

TrendMD:

LUO Xiao-Lie, LIU Jin, HU Ke-Liang, MA De-Zhu. The Study on the Chain Extension Reaction of MDI and TDIT erminated Polyester Prepolymers with Extenders[J]. Chem. J. Chinese Universities, 1995, 16(5): 799.

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The Study on the Chain Extension Reaction of MDI and TDIT erminated Polyester Prepolymers with Extenders

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