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|Title:||Multilayer NIR reflective coatings on transparent plastic substrates from photopolymerizable nanoparticulate sols|
Oliveira, Peter William de
Schmidt, Helmut K.
|Year of Publication:||1999|
|OPUS Source:||Thin solid films. - 351. 1999, 1/2, S. 225-229|
|SWD key words:||Mehrschichtsystem|
|DDC notations:||620 Engineering and machine engineering|
|Publikation type:||Journal Article|
|Abstract:||A new synthesis and processing route for preparing multilayer interference coatings on plastic substrates has been developed. For this purpose, alcoholic sols of surface modified (3-glycidoxypropyltrimethoxysilane, GPTS) SiO2 and TiO2 particles with sizes of 10 and 4 nm, respectively, were synthesized. Layers were prepared by dip coating, subsequent UV curing (2.1 J/cm(2)) acid thermal post treatment at 80 degrees C for 15 min. Refractive indices of n(D) = 1.47 for SiO2 layers and n(D) = 1.93 for TiO2 were measured. As an example, plastic sheets were coated by angle dependent dip coating with withdrawal speeds from 3 up to 6 mm/s and sin inclination angle of 4 degrees. By this way, one side of the substrate was coated with six quarterwave thick layers (peak wavelength at 750 nm), producing a reflective interference filter with a reflectivity of 72% between 650 and 900 nm. On the other side of the substrate, an interference filter with a reflectivity of 66% between 800 and 1100 nm was produced simultaneously. The interference coatings do nor show delamination or defects after boiling water test (H2O + 5 wt.% NaCl, 8 h) and excellent adhesion (GT 0, TT 1) was obtained in the cross cut tape test. Yellowing did not occur (Delta(g) < 3) and the mechanical properties of the interference filters were not altered after dry sun test at 760 W/m(2) for 270 h. For mechanical protection a nanocomposite hardcoat can be applied on top of the NIR reflectance filters without changing the optical properties remarkably.|
|Link to this record:||urn:nbn:de:bsz:291-scidok-29594|
|Date of registration:||1-Sep-2010|
|Faculty:||SE - Sonstige Einrichtungen|
|Department:||SE - INM Leibniz-Institut für Neue Materialien|
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