Master of Science (MS)
Medical Sciences Interdepartmental Area
Mark W. Beatty
Current materials used for facial prostheses are far from being desirable, and improved properties with “skin-like” feel are needed. This study evaluates property changes induced by sequential additions of uncoated and hydrophobic-coated nano-SiO2 to polydimethylsiloxane (PDMS) and compares them with those measured for conventional submicron SiO2-filled materials. Each filler type was sequentially added to vinyl-terminated PDMS at 0%, 0.5%, 5%, 10%, and 15% by weight. Tensile, tear, Durometer hardness, translucency and viscoelastic properties were evaluated, with hardness and translucency also evaluated following 3000 hours of outdoor weathering. Results demonstrated that 15% coated nano-SiO2-filled PDMS materials produced the highest tensile strength, elastic modulus, storage modulus, loss modulus, tear strength, and durometer hardness (p2-filled materials demonstrated the highest failure strain and translucency parameter (p2 PDMS materials, but the increases were deemed too low to be clinically detectable. Only unfilled and 0.5%-filled PDMS formulations darkened from weathering, as higher filler levels offered protection against solar radiation, heat and moisture. It was concluded that superhydrophobic-coated nano-SiO2-filled PDMS favorably produced the strongest, most tear resistant and least translucent materials, but also generated low stretch ability and high hardness that were considered to be unfavorable in achieving a “skin-like” feel.
Aulia, Rahmi K., "Effect of Nanofiller Coating and Loading on Facial Elastomer Physical Properties" (2020). Theses & Dissertations. 474.
Available for download on Thursday, August 04, 2022