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 successfully 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 concentration. 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.

Modification and photostabilization of low density polyethylene film by photodecomposition of various diazo-compounds and methyl azidocarboxylate

CAPPELLI, Chiara;
2007

Abstract

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 successfully 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 concentration. 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/59402
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