UV curable bismaleimides films with functionalized colliodal silica

Abstract

Abstract Four acrylated bismaleimides were formulated with PDMS functionalized silica colloids and UV-cured. The acrylated bismaleimides were synthesized via a two-step procedure. The first step involved the solution imidization of 2,2′-Bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA), with 4,4′-oxydianiline (ODA) or Bisaniline M (BIS M), 2,2-Bis(amino-4-hydroxyphenyl)hexafluoropropane (BIS-AP-AF) and maleic anhydride (MA) to form hydroxylated bismaleimide. In the second step, the hydroxylated bismaleimide was reacted with acryloyl chloride to form an acrylated bismaleimide. Then, the acrylated bismaleimide was formulated with acryloyl morpholine (AMP) and photoinitiator with or without the addition of PDMS-silica nanoparticles and UV-cured. The curing kinetics were investigated by real-time FTIR and photo-DSC. The kinetic data revealed that the PDMS-silica particles accelerated the photocure rate. The dispersion of PDMS-silica nanoparticles on the film surface was investigated by SEM. Abrasion properties were evaluated using a Taber Abraser. The optimal abrasion resistance was achieved with 3.0 wt% PDMS-silica loading.