Polymer sheets with a thin nanocomposite layer acting as a UV filter

✍ Scribed by Tasoula Kyprianidou-Leodidou; Patrick Margraf; Walter Caseri; Ulrich W. Suter; Paul Walther

• Book ID: 101290816
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 215 KB
• Volume: 8
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199708)8:8<505::aid-pat678>3.0.co;2-u

✦ Synopsis

A surface layer (thickness 1-10 m) containing colloidal TiO 2 or ZnO particles was prepared in EVA (a copolymer of ethylene and vinyl acetate). The inorganic particles were formed in situ by hydrolysis of incorporated titanium tetrachloride or diethyl zinc. The resulting materials were analyzed with UV spectroscopy, electron microscopy, Xray diffraction, thermogravimetric analysis and atomic emission spectroscopy. The average diameter of the embedded TiO 2 particles was 70 nm; these particles absorb UV radiation but also induce opacity in the polymer sheets in the visible wavelengths range. The ZnO particles were smaller (average diameter 15 nm); with a surface layer of embedded ZnO, transparent polymer sheets can be obtained that absorb UV radiation.