摘要
Bismaleimides (BMI) and their corresponding polymers could be obtained with diamine compounds as precursors. In this work, a new Meldrum's acid (MA)-functionalized BMI compound (MA-BMI) and a MA-functionalized polyaspartimide (MA-PAsI) were synthesized with a MA-diamine precursor. Based on the MA-mediated ketene chemistry, additional crosslinking reactions and high crosslinking densities were introduced to the crosslinked MA-BMI (CR_MA-BMI) and crosslinked MA-PAsI (CR_MA-PAsI) polymers. This modification brought high glass transition temperatures of 340 °C and 313 °C to crosslinked CR_MA-BMI) and CR_MA-PAsI, respectively. Moreover, the air-trapped microcavities formed with the evolved CO 2 from MA thermolysis reaction attribute to reduce dielectric constants of the crosslinked polymers. The dielectric constants at 40 GHz of CR_MA-BMI and CR_MA-PAsI are 3.01 and 2.21, respectively. Novel maleimide-based resins for high speed and high frequency communication technologies have been demonstrated.