摘要
Furan-functionalized Meldrum's acid (MAF) has been utilized as a monomer for the preparation of self-crosslinkable polymers which possess Meldrum's acid (MA) moieties as the reactive sites. As MAF contains acidic C-H and furan groups, both are reactive toward maleimide groups, and polymerization has been carried out between MAF and multi-functional maleimide compounds. Both linear and hyperbranched MA-containing self-crosslinkable polymers have been prepared. The prepared polymers show good solubility in aprotic high polar solvents and high film formability. Self-standing and highly flexible crosslinked films have been obtained. The polymer film shows high solvent resistance, a high glass transition temperature of 298 °C, a high thermal stability above 340 °C, and attractive mechanical properties with a Young's modulus of 3.58 GPa and a stress at break of 34.4 MPa. Moreover, the crosslinked polymer films have relatively low-dielectric constants of about 2.85-2.78. An effective approach has been demonstrated for the preparation of high molecular weight MA-containing polymers and the corresponding thermosetting resin based self-standing and flexible polymer films.