DTIC ADA110807: Kinetics of a Sterically Hindered pdf

DTIC ADA110807: Kinetics of a Sterically Hindered

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Fourier Transform Infrared Spectroscopy (FT-IR) and Torsional Braid Analysis (TBA) were used to study the reaction of an epoxy resin system cured with a sterically hindered amine. Isothermal torsional braid analysis showed the apparent activation energy to be approximately 42 kJ/Mol. The reaction kinetics were also considered from the unreacted freshly mixed condition and a partially reacted ‘B-staged’ condition using infrared spectroscopy. The B-staged condition using infrared spectroscopy. The B-staged condition is unreactive and stable at room temperature due to the quenching of the primary amine reaction by the glassy structure and the steric hindrance of the secondary amine reaction. Apparent activation energies for these two conditions were found to be 49.4 kJ/Mol. and 49.0 kJ/Mol. respectively. The storage life at room temperature of the B-staged resin system is predicted to be at least three months based on extrapolation of the experimental kinetic data. (Author

• Creator/s: Defense Technical Information Center
• Date: 11/2/1981
• Year: 1981
• Book Topics/Themes: DTIC Archive, Buckley, Leonard J, NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE, *FOURIER TRANSFORMATION, *INFRARED SPECTROSCOPY, *CURING, *EPOXY RESINS, EXPERIMENTAL DATA, REACTION KINETICS, ROOM TEMPERATURE, AMINES, MOLECULAR STRUCTURE, STEREOCHEMISTRY, ISOTHERMS, TORSION, SHELF LIFE, EXTRAPOLATION, ACTIVATION ENERGY

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