Summary
Ultraviolet irradiation in the presence of benzophenone (BP) as a photosensitizer was used to graft vitamin K1 (VK1) onto a film of medical grade isotactic polypropylene. The effects of various reaction conditions on the graft yeild of the samples and the changes in physicochemical properties of the sample surfaces were determined by FTIR and surface tension measurements. Increases in the ultraviolet irradiation time for the first 60 minutes markedly increased the graft yield linearly before leveling off above the 0.3 vol.% vitamin K1 concentration. A 2 wt.% concentration of BP produced the maximum graft of VK1. The surface tension of the samples increased to a value of 38 dyne/cm with increasing graft yield.
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Chun, HJ., Beard, R.B. Ultraviolet-induced graft reaction of quinoid compounds onto polypropylene films. Polymer Bulletin 35, 575–582 (1995). https://doi.org/10.1007/BF00324111
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DOI: https://doi.org/10.1007/BF00324111