Abstract
The reaction of 2,4-dihydroxybenzophenone (DHBP) with N-[4-(chlorocarbonyl)phenyl] maleimide provided a novel monomeric ultraviolet (UV)-absorber in the presence of triethylamine. This reactive maleimide was bound onto the backbone of high density polyethylene (HDPE) by melt-grafting in a mini-mixer. The extent of grafting of the monomeric maleimide was quantified by infrared (IR) spectroscopy. To find the optimal grafting conditions, the dependence between reaction temperature, time and the concentration of the monomeric UV-absorber were investigated on the grafting yields. The photo-stabilizing effect of the grafted HDPE was evaluated in a xenonarc weathering apparatus and compared with HDPE mixed with the UV-absorbers using the carbonyl index of the IR spectrum. The grafted HDPE retarded the light initiated oxidation to a greater extent.
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Na, HS., Kim, T.H. Grafting of maleimide containing 2-hydroxy-benzophenone onto polyethylene: Reaction conditions and photo-stabilization effects. Macromol. Res. 22, 958–962 (2014). https://doi.org/10.1007/s13233-014-2133-7
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DOI: https://doi.org/10.1007/s13233-014-2133-7