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On the action of ozone at high concentration on various grades of polyethylene and certain straight chain paraffins
Authors:Franco Cataldo  Aldo RosatiEdo Lilla  Ornella Ursini
Affiliation:a Lupi Chemical Research, Via Casilina 1626/A, 00133 Rome, Italy
b Institute of Chemical Methodologies, CNR, Via Salaria Km. 29, 300 00016 Monterotondo, Stazione, Rome, Italy
Abstract:The surface functionalisation of UHMWPE (ultra high molecular weight polyethylene) was successfully achieved by the action of ozone (10% by weight in oxygen) under mild conditions. The kinetics of the gas-solid reaction between O3 and UHMWPE in powder form were measured in an IR gas cell and the pseudo-first-order rate constant was kUHMWPE = 1.9 × 10−4 s−1. The resulting surface-oxidized UHMWPE was studied by FT-IR spectroscopy and the nature of the surface functionalities was determined. Furthermore, the surface-oxidized UHMWPE was studied by DSC (differential scanning calorimetry). It was evident that ozone attacks and oxidizes the amorphous phase of UHMWPE preserving the crystalline phase because after the ozone treatment there was an increase in the % of crystallinity. Two other polyethylene grades having respectively Mw = 15,000 Da (defined as LMWPE = low molecular weight polyethylene) and Mw = 4000 Da (defined as VLMWPE = very low molecular weight polyethylene) were studied as model compounds in comparison to UHMWPE in their reaction with ozone. Commercial liquid paraffin and n-dodecane were used as model compounds to study the reaction between high ozone concentration and alkanes.
Keywords:Polyethylene   UHMWPE   Ozone   Surface oxidation   Surface functionalisation
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