Kinetic and Rheological Studies of a Model In-Situ Molecular Composite System (PAA/DNI-3A)
Final rept. Apr 1989-Jun 1990
WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
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A model compound of In- Situ Molecular Composite system, polyamic dialkylamide was prepared and characterized in an attempt to better understand the rod conversion for designing a processing scheme for these materials. The conversion kinetics and the chemorheology of the system were studied by using FTIR and TICA. The activation energy was found to be higher than the values reported for polyamic esters. The rod conversion kinetics was controlled by rheology. Two different kinetic rates were observed before and after the vitrification point. A Fixed-Time-Interval method for using FTIR data to analyze kinetic rate was developed. The effect of pressurization on the thermal behavior of the model system was analyzed. This study clearly indicated that the rod conversion chemistry is rheologically controlled.