摘要
Thermosetting resins based on Meldrum's acid (MA) derivatives as monomers show high thermal stability and inherent low-dielectric constants. In this work, a multifunctional MA derivative (MA-bisF) possessing two MA and two furan groups is newly prepared. Characterization of MA-bisF has been carried out with Fourier transform infrared, 1 H NMR, mass spectroscopy, and elemental analysis. Self-crosslinking MA-bisF results in the corresponding thermosetting resin mediating the addition reaction between ketene/ketene and ketene/furan groups. MA-bisF is also utilized as a modifier for bismaleimide (BMI) resins through polymerizing MA-bisF and BMI through Diels-Alder reaction. The corresponding crosslinked MA-bisF/BMI resin possesses a high content of fused-ring structure and a high crosslinking density, so as to exhibit high thermal stability (392 °C), high glass transition temperature (262 °C), high char yield (48 wt%), and a low-dielectric constant of 2.78 at 1 MHz. A new type of reactive polymers and the corresponding high-performance crosslinked resins has been demonstrated.