Fumarate Metal Organic Frameworks as Reactive and Curing Reaction Alternant in Hydrophobic Bispropargyl Ether Based Matrix Resin System

Abstract

Abstract Acetylene terminated polymers are gaining interest due to the need for easily processable thermally stable networks. The Metal Organic Frameworks (MOFs) - aluminum fumarate (Al_FA_A) and copper fumarate (Cu_FA_A) MOFs were synthesized and blended with bispropargyl ether (bis (4-propargyloxyphenyl) sulfone - SPE). The (SPE + 1 % MOFs) blends were characterized and thermally polymerized to give P(SPE + MOFs). The synthesized materials were characterized using FTIR, DSC, TG and TG-FTIR. The addition of both MOFs decreased the enthalpy of fusion and enthalpy of curing by 60 %. The addition of copper MOF to SPE drastically reduced the temperature at which the thermal curing was maximum (300 °C to 252 °C). The 2-H chromenes were formed from bispropargyl ethers by Claisen-type sigmatropic rearrangement. Compared to pure SPE, the polymers resulting from hybrid systems show a slower thermal degradation rate. The sulfone as a swivel group in SPE and the involvement of fumarate π-bonds of MOFs during polymerization makes the material more versatile. The investigation concluded that these novel inorganic-organic hybrid blends may be a good start for low-temperature curable sufficiently thermally stable matrix resin systems having a wide scope of applicability in the field of filler-reinforced composites.