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Abstract

In a study of determining the best propellant binder composition that composed by HTPB 2014 and TDI 2013, the composition of HTPB: TDI 15: 1 is failed to be cured. Mixing parameters are supposed to influence the curing failure of the prepolymer. Identification of the functional groups contained in the prepolymer can provide a deeper knowledge about that influences. This study aimed to know the effect of mixing parameters on the functional groups contained in the fail cured prepolymer HTPB: TDI 15: 1 by using Infrared Spectrophotometer. The research methods include mixing characterization which are the calculation of Reynolds and Froud Numbers, and analysis of functional groups contained in the fail cured prepolymer HTPB: TDI 15: 1 by using FT-IR Shimadzu. It is known from the infrared spectrum that the fail cured prepolymer contains a stretching NH (3375.43 cm-1), OH (3527.8 cm-1), -NCO (2274.07 cm-1), -C = O (1732.08 cm-1), COC (1097.5 cm-1), Amide I (1699.29 cm-1), Amide II (1537.27 cm-1), Amide III (1220.94 cm-1), 2, 6 - TDI (815.89 cm-1), free OH of HTPB (3400.5 cm-1) and urea (1681.93 cm-1). It was concluded that the Reynolds number of 0.8698 - 0.8921 with a total stirring time of 20 minutes are able to cause the reaction of the urethane bond ormation with the appearances of peaks of NH, OH, -NCO, -C = O and C-O-C and Amide I, II and III. However, the reaction is uncomplete with the peaks of 2,6-TDI and free hydroxyl. Meanwhile, Froud number prepolymer of 0.0142 has been capable of dissolving air that contain water vapor in mixing process, resulting in the formation of urea.

Keywords

Polyurethane Mixing Infrared spectroscopy

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