Abstract
Effect of carbazole (CZ)/tetracyanoethylene (TCE) binary sensitizer on photografting of methacrylic acid on low-density polyethylene film (thickness = 30 μm) was examined at 40° and 60° in aqueous medium. Based on the study of absorption spectra, CZ and TCE seemed to form a 1:1 complex, appearing at 400 and 600 nm in the spectra. The system sensitized with CZ/TCE binary sensitizer showed higher percent grafting and graft efficiency than the CZ-sensitized system. Moreover, a certain composition of the binary sensitizer most effective for grafting was found; this composition was about 30 mol% of TCE in the binary sensitizer, at which maxima of percent grafting and graft efficiency were afforded. This behaviour of CZ/TCE-sensitized photografting was discussed in terms of formation of a charge transfer complex between CZ and TCE and formation of polyethylene radicals caused by the binary sensitizer.
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