Polysulfone (PSF)s are amorphous polymers which possess excellent thermal stability and good optical properties. But they have drawbacks such as poor chemical resistance and high thermal expension property. In this study, we introduced crosslinkable acrylic moiety in PSF with side-chain using chloromethylation method. We prepared photosensitive PSF having methylene methacrylate side-chain from chloromethylated polysolfone (CMPSF). And we performed solvent casting films of the polysulfone methylene methacrylate (PSFMM) and produced the crosslinked PSF films via UV expose. Their properties such as the thermal, optical, gas barrier properties, and chemical resistance were measured by TGA, DSC, TMA, UV-transmittance, MOCON test, and solubility test. The crosslinked PSFMMs were insoluble in various protic and aprotic polar solvents. They have low CTE (coefficient of thermal expansion) value and gas barrier property improved according to increase of crosslinkable moiety.
The polysulfone has a good optical and thermal property. But it reveals poor chemical resistance in organic solvent such as NMP, DMAc. We introduced cross‐linkable imide moiety for the modification of polysulfone which could be overcome above shortcoming for display substrate based on plastic film. The cross‐linked polysulfone with imide chain had low CTE decreasing to 15% and the glass transition temperature (Tg) increasing to 252 °C.
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