Durability of solid fluoropolymer thin films on metal surfaces for silicone oil creep
1983; Elsevier BV; Volume: 15; Issue: 1-4 Linguagem: Inglês
10.1016/0378-5963(83)90024-7
ISSN1878-1071
Autores Tópico(s)Silicone and Siloxane Chemistry
ResumoThe lifetimes of two fluoropolymer films intended to prevent silicone oil spread are determined using thermal aging as an accelerating mechanism and Auger spectroscopy to detect silicone oil. Both the fluoropolymer barrier coating solutions contain the same solute, a 0.1 wt% concentration of the polymer poly-1H, 1H-pentadecafluoroctyl methacrylate (PFOMA). The solvents are different with one being Freon TF and the other a mixture of 10% Freon TF and 90% perfluoro-2- butyltetrahydrofuran. At this concentration, the surface films are about 120 to 200 Å thick and are solid polymer films, for the solvents - being volatile - evaporate, leaving the polymer coating on the surface. Device design standards require a 40 year lifetime at 70°C and below. It was determined from an extrapolated Arrhenius relationship that PFOMA in Freon TF (PFOMA-1) has a 40 year life at temperatures up to 55°C while PFOMA in the other solvent (PFOMA-2) has a lifetime exceeding 40 years at 70°C. Through the polymer in the two solutions is the same, the solvent in PFOMA-2 leaves a relatively more uniform spatial distribution of the polymer film compared to the solvent in PFOMA-1. This is considered to be the reason for the significant improvement in lifetime for PFOMA-2.
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