Flexible transparent projection screen of polycarbonate matrix integrated with functionalized alumina particles

Solution blending approach was introduced to prepare flexible Polycarbonate (PC)-based composited films with excellent transparent projection performance. After modified by an aluminate coupling agent DL-411(ACA-1), alumina (Al 2 O 3 ) possesses improved dispersity. There may form oxygen bridge between aluminum atoms on Al 2 O 3 and ACA-1. With the long aliphatic chain directing outwards, the compatibility between PC and modified Al 2 O 3 was significantly improved. The dispersion of Al 2 O 3 particles in PC was therewith promoted. After vacuum drying, well-blended mixtures were developed and PC films containing Al 2 O 3 clusters can be prepared. The composite films have good light transmission and diffuse reflection effects. When Al 2 O 3 /PC mass ratio is beneath 0.2, the composited films possess excellent transparency comparable with pure PC film. The diffuse reflection performance of PC composite films is gradually enhanced with the increase of Al 2 O 3 content. When Al 2 O 3 /PC ratio attains 0.1, the visible light reflectance amounts 15%, which can even exceed 30% with the ratio reaches 0.5. The composite films show improved resistance to UV irradiation as the visible light reflectance and transparency are comparable to un-radiated samples. The hydrophobicity of composite films with a certain Al 2 O 3 amount increases, which brings forth good anti-moisture property for these transparent projection screen films.