Mark D. Soucek
Department of Polymer Engineering, University of Akron, Akron, OH 44325, USA
[email protected]
Maleimide-terminated imide (MTI) and acrylated maleimide oligomers/polymers with
varying molecular weight were synthesized and characterized by nuclear magnetic
resonance (NMR) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and
size exclusion chromatography (SEC). The MTI maleimide polyimide oligomers were
formulated with two reactive diluents, N,N-dimethylacrylamide (DMAA) or Nvinylpyrrolidone (NVP), and were photopolymerized with and without a photoinitiator
(PI). The acrylated bismaleimides were formulated with AMP. The kinetics of film
formation was investigated using real-time FTIR and photo-differential scanning
calorimetry (DSC). Thermal and viscoelastic properties of UV cured films were studied
by thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and DSC.
When no photoinitiator was used, the imide/NVP formulations polymerized and the
DMAA/imide formulations did not.
It was surmised that the NVP reacted via a
donor/acceptor complex, and the DMAA could not due to the electron-poor double
bond. The acrylated maleimides were formulated with and without silica. Both the
reaction rates and the abrasion resistance were effected by the silica loading.