Cosmetic, Nanoclay and Functional Pigment Performance in UVB-Irradiated Facial Elastomers (original) (raw)

Abstract

Objectives: This study assessed color and durometer hardness changes resulting from controlled UVB exposures delivered to pigmented PDMS elastomers. Cosmetic red (CR) and yellow (CY), nanoclay red (NR) and orange (NO), functional intrinsic red (IR) and yellow ochre (IYO), extrinsic red (ER) and yellow ochre (EYO) pigments, plus unpigmented controls (U) were compared. Methods: 0.1 wt% pigment was mixed into vinyl-terminated PDMS containing 13 wt% silica filler. Equimolar polymethyl hydrogen siloxane crosslinker was added and the mixture polymerized into discs 34 mm diameter x 6 mm thick. Each formulation was subjected to UVB radiation (0.72 J/cm2/h,25C,30% r.h.) or control environment (darkness,25C,30% r.h.). CIEL*a*b* color and durometer hardness were measured at 0, 600, 1800 hours (n=5), and group differences assessed by pigment and environment (ANOVA/Tukey, p≤0.01). Results: After 600 hours, color changes were imperceptible (ΔE*<1.1), except for UVB-exposed NO (ΔE*=6.8) and NR ...

Mark Beatty hasn't uploaded this paper.

Let Mark know you want this paper to be uploaded.

Ask for this paper to be uploaded.