Mechanical and Optical Properties of Eu(TTA)3phen and UV-stabilizer Doped LDPE Film under Natural Weathering Condition

摘要

Low-density Polyethylene films doped with 0.1 % Eu(TTA)?phen with and without the addition of 0.1% UV-stabilizer were hot-blown by a lab scale extrusion process. The average thickness of the films was 100 μm and was exposed under natural weathering conditions for 1,000 hours to evaluate their optical and mechanical properties. A commercial agriculture film with the same average thickness under the same exposure and conditions was used as reference. Mechanical properties of the films before and after the exposure were measured according to ASTM D882 standards. The optical and chemical properties were characterized by spectrofluorometer and FTTR. Mechanical tests showed that tensile strength (TS) and elongation at break (EB) of the doped films in machine direction (MD) orientation decreased after the exposure, but still comparable to commercial films. All emission transition lines of Eu3+ ions for doped films were observed when excited at 394 ran whilst the highest peak was detected at 612 ran. The highest peak intensity of LDPE doped Eu(TTA)?phen without UV-stabilizer dropped by 90% after the exposure. These results indicated that incorporation of UV-stabilizer has prolonged and increase the ability of the films to endure photo degradation effects, offering improved greenhouse plastic films.