Effects of UV Stabilizers on Polypropylene Outdoors.

Effects of UV Stabilizers on Polypropylene Outdoors.

Materials (Basel, Switzerland) (2020-04-05)

Witold Brostow, Xinyao Lu, Osman Gencel, Allison T Osmanson

ABSTRACT

Hindered amine light stabilizers (HALSs) and nano ZnO were used to stabilize polypropylene (PP) film-based formulations that were exposed to ultraviolet (UV) light for different lengths of time, simulating the harsh outdoor weather of Dallas, Texas, USA. UV doses applied in our laboratory are 121 times larger than the UV dose provided by the sunlight in Texas. 15 different compositions were studied. Tensile behavior, UV transmittance, thermal stability (by thermogravimetric analysis) and dynamic friction of the so exposed PP-based films were determined. Scanning electron micrographs of fracture surfaces were obtained. Nano-ZnO-containing stabilizers impart strong UV resistance to our films. The combination of HALSs and nano-ZnO stabilizers makes the PP films harder-which is important for some PP applications, such as toy manufacturing.

MATERIALI

N° Catalogo

Marchio

Descrizione del prodotto

P0027

Sigma-Aldrich

Pyrvinium pamoate salt hydrate, ≥98% (HPLC)

70624

Sigma-Aldrich

Tuner(DE3)pLysS Competent Cells - Novagen, Tuner host strains are lacZY deletion mutants of BL21, which enable adjustable levels of protein expression throughout all cells in a culture. T7 lysozyme expression suppresses basal T7 expression.