Studies on Thermal and Dynamic Mechanical Properties of RIM and Solution Polymerized Polyureas with Various Hard Block Contents

Abstract

Abstract: Aseries of amine terminated polypropylene oxide based on thermoplastics polyureas with 30%,50% ,and 70% hard segment contents were synthesized via solution polymerization and reaction injection moulding (RIM). Amine terminated polypropylene oxide was used as the soft segment and 4,4'-diphenylmethanediisocyanate (MDI) extended with diethyltoluenediamine (DETDA) was used as the hard segment. These polyureas were characterized by differential scanning calorimetry (DSC), dynamic mechanical spectroscopoy (DMS). RIMpolyureaas have poorer phase separation than solution polyurea as seen by DSC,DMS, especially at high hard segment levels. Any evidence of a hard segment glass transition in polyureas has not been found by DSCand DMS.

Key words: Polyurethane, Polyurea, Reaction injection molding

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Chen Zhusheng, Willkomm W R, Macosko C W. Studies on Thermal and Dynamic Mechanical Properties of RIM and Solution Polymerized Polyureas with Various Hard Block Contents[J]. Chem. J. Chinese Universities, 1990, 11(4): 410.

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Studies on Thermal and Dynamic Mechanical Properties of RIM and Solution Polymerized Polyureas with Various Hard Block Contents

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