| Popis: |
The NIST (National Institute of Standards and Technology) SPHERE (Simulated Photodegradation via High Energy Radiant Exposure) was used to obtain acceleration parameters, such as activation energies, for bisphenol A polycarbonate (PC), poly(butylene terephthalate) (PBT), a PC/PBT blend, and poly(styrene-co-acrylonitrile) (SAN) containing 3% rutile titanium oxide white pigment. The responses were color shift and 60 gloss loss. The materials exhibited excellent reciprocity over the irradiance range of the SPHERE for both properties. Activation energies for color change were 16–21 and 9–16 kJ/mol for gloss loss. Relative humidity (RH) was varied over the range of |
