Elsevier, Polymer Degradation and Stability, 5(92), p. 849-858
DOI: 10.1016/j.polymdegradstab.2007.01.025
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Various diazo-compounds, 1,2,2,6,6-pentamethylpiperidin-4-yl diazoacetate (PMPDA), 2,2,6,6-tetramethylpiperidin-4-yl diazoacetate (TMPDA), methyl diazoacetate (MDA), 1,2,2,6,6-pentamethylpiperidin-4-yl 2-diazo-3-methyloxycarbonylpropionate (PMPMDS), 1,2,2,6,6-pentamethylpiperidin-4-yl 2-diazo-4-methyloxycarbonylbutanoate (PMPMDP), and one azide, methyl azidocarboxylate (MAC), were success-fully prepared and grafted on polyethylene films by UV light (l > 210 nm) activation. The treated films were characterised by FT-IR spectroscopy and contact angle measurements. Ab-initio quantum mechanical calculations allowed simulating the IR absorption spectra of the polymer grafted species. These last and the related grafting yields are discussed with reference to the diazo-compound structure and con-centration. Up to 8.6 mol% of bonded groups (grafted groups/ethylene monomeric unit) were found without affecting the polymer molecular weight distribution, as shown by GPC analysis. All modified films bearing HAS groups showed very high photo-stability.