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APSTArizona Public Service-Transmission (Phoenix, AZ)
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APSTAviation Products and Services Team
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APSTAdvanced Professionals Serving Technology
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APST is documented lot traceable with identification on bags and offers documented quality control.
For more information on AdvantaPure's APST platinum-cured silicone tubing, contact the AdvantaPure team at 145 James Way, Southampton, PA 18966; phone 888-755-4370 or 215-526-2151; fax 888-258-4293 or 215-526-2167; e-mail: sales@advantapure.
Accordingly, our particular interest is to incorporate this green Ce-based salt compound as a corrosion-inhibiting dopant into the APST and to investigate its ability to enhance the potential of a polysiloxane-based polymer as a corrosion-preventing thin barrier layer.
A 25% APST solution was diluted by adding an appropriate amount of deionized water to prepare a 20% APST aqueous precursor.
The surfaces of these substrates were coated with the nondoped and doped APST precursor solutions in the following sequence; First, to remove any surface contaminants, the test panels were immersed for 20 min at 80[degrees]C in an alkaline solution consisting of 0.
The surface tension of doped APST solutions was determined with a Cenco-DuNouy Tensiometer Model 70535.
Table 1 gives the pH values and surface tensions of the standard 20 wt% APST solutions modified with 0.
9) Since good wetting by the solution contributes to a good coverage of solid film in terms of a defect-free, continuous barrier layer over the metal's surfaces, it is very important to know the magnitude of wetting and spreading behaviors of modified APST solutions on the metal surfaces.
We previously reported that heating the APST solution transformed it into a solid film, which led to polycondensation reactions between the silanol groups within the APST, thereby forming the network structure of the polyaminopropylsiloxane (PAPS) polymer.
To respond to this intriguing question, we investigated the FTIR spectra of the solid films made by heating the unmodified, and 3, 6, and 10 wt% Ce acetate-modified 20 wt% APST solutions at 150[degrees]C.
By comparison with the spectral features of the unmodified APST-derived film, the spectrum (Figure 2b) of the film derived from the 3 wt% Ce acetate-modified APST was characterized by the appearance of four new bands at 1659, 1554, 1380, and 1302 [cm.
2] groups in APST were depleted by the amidation reaction with Ce acetate, and then were substituted by the acetamide groups, -CO-NH-C[H.