Synthesis of tri‐aryl ketone amine isomers and their cure with epoxy resins
Abstract
Isomeric tri‐aryl ketone amines, 1,3‐bis(3‐aminobenzoyl)benzene (133 BABB), 1,3‐bis(4‐aminobenzoyl)benzene (134 BABB), and 1,4‐bis(4‐aminobenzoyl)benzene (144 BABB) are synthesized and cured with diglycidyl ether of bisphenol A and diglycidyl ether of bisphenol F in this work. Differential scanning calorimetry and near‐infrared spectroscopy reveal higher rate constants and enhanced secondary amine conversion with increasing para substitution attributed to resonance effects and the electron withdrawing nature of the carbonyl linkages. Glass transition temperatures increase from 133 BABB to 134 BABB, but decrease modestly for the 144 BABB hardener. With increasing para substitution, the flexural modulus and strength both decrease while the strain to failure increases but all BABB amines displaying higher mechanical properties than the corresponding 4,4‐diaminodiphenyl sulfone (44 DDS) networks. The thermal stability of the BABB networks is found to be modestly lower than 44 DDS, but char yields are significantly higher. Changes in thermal and mechanical properties are described in terms of molecular structure and equilibrium packing density.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 10, 2019
- Source ID
- 10.1002/pat.4818
Entities
People
- Buu Dao
- Jeffrey S. Wiggins
- Johan Bijleveld
- Larry Q. Reyes
- Russell J Varley
- Sam Tucker
- Steve Christensen
- Theo J Dingemans
- Wouter Vogel
Organizations
- Australian Research Council
- Boeing
- Delft University of Technology
- Office of Naval Research Global
- University of North Carolina
- University of Southern Mississippi