Title : Application of Reactive Metal Organic Framework (MOF) in High Temperature Bismaleimide Based Thermoset Polymers
Abstract:
Bismaleimides (BMI) is a high-performance thermosetting resin system that has a variety of characteristics, including strong thermal and mechanical stability, chemical resistance, water resistance, corrosion resistance and a comparatively cheap price. BMI is utilized in a multitude of applications, the majority of which are for airplanes and missiles, due to its exceptional epoxy qualities. Metal Organic Frameworks (MOFs) have been developed and designed at an exponential rate as a result of their increasing complexity and use. The benefits of MOFs are numerous and they have biological as well as several smart domain applications. The 4,4’-bismaleimido diphenylmethane (BMIM) is synthesized using maleic anhydride and diamine. The chain extension for BMIM is done by 4,4’-diamino diphenylmethane (DDM) and the resulting material is coded as BMIM_M. The effect of nanoporous aluminum fumarate (Al_FA_A) metal organic framework (MOF) as reactive filler in BMIM and BMIM_M is focused. The Fourier Transform Infrared Spectroscopy (FTIR) has been used to confirm the structure of the synthesized compounds. The presence of distinct bands at 1400 and 1706 cm-1, which are responsible for the C=C and -OC-N-CO- groups, respectively, confirmed the structure of BMIM. Increase in the aliphatic C-H band intensity is observed over the range of 2900–2940 cm-1, which indicates the increased CH group in BMIM_M due to the Michael addition of the aromatic primary amine to the maleimido double bonds. The thermo physical properties are studied using Differential Scanning Calorimetry (DSC) and Thermogravimetry (TGA). The BMIM showed melting at 144 ?C and the enthalpy of fusion was found to be 19.8 J g-1. The chain extended BMIM (BMIM_M) was to melt considerably at a lower temperature (71 ?C) and the enthalpy of fusion was found to be 2.8 J g-1, much lower than the enthalpy of fusion of BMIM. Thermal degradation of polymerized BMIM (PBMIM) and BMIM_M (PBMIM_M) show two stages of degradation. The first stage of degradation falls at 455 and 400 ?C for PBMIM and PBMIM_M respectively. The second stage of thermal degradation lies at the same temperature 553 ?C for both the materials. The polymerized Al_FA_A MOF blended BMIM (PBMIM_AL_F_A) and BMIM_M (PBMIM_M AL_F_A) show single stage of thermal degradation and the rate of degradation was found to be maximum at 428 and 469 ?C respectively. The volatile products obtained during the thermal degradation of these polymers were analyzed investigated using thermogravimeter coupled to a Fourier transform infrared spectrophotometer (TG-FTIR). The detailed thermal studies of the monomers, blends and polymers are studied and reported in this work.
What will the audience learn from your presentation?
? To highlight the most important thermoset materials used in industry, such as BMIM
? Understanding the thermal behavior of BMIM and its chain-extended BMIM
? To know the modifications in thermal behavior brought about by the use of MOF as a reactive filler
