PFAM initiator

Kim et al. [46,47] reported the synthesis of fluorosilicone block copolymers of poly(perfluoroalkylethyl acrylate)-fc-poly(3-[m s(trimethylsilyloxy)-silyl] propyl methacrylates) (PFA-i>-PSiMAs) by a three-step synthetic approach. In the first step, a PFA macromonomer (PFAM) was made by free radical polymerization. Thereafter, a condensation reaction was applied to prepare the PFAM initiator (PFAMI). Finally, the PFAMI and SiMA were reacted to prepare the PFA-i>-PSiMAs block copolymers. In early studies, synthesis of fluorosilicone block copolymers was reported by Boutevin et al. [48-50]. However, two-step hydrosilylation was carried out to prepare the photo-cross-linkahle fluorinated PDMS as reported by Boutevin et al. [48]. In another study, Luo et al. [51] prepared poly(dimethylsiloxane)- -poly(2,2,3,3, 4,4,4-heptafluorobutyl methacrylate- -poly(styrene)... 

The values of the water contact angle of the PFAM film on the slider surface also increased with the concentration of PFAM solutions (Fig. 5 [26]). The water contact angle increased up to 121 ° at 200 ppm from the initial values of 88.4° without the PFAM film, indicating that the PFAM had covered the slider surface well. For N-Hexane, the contact angle was only about 48°, but the contact area was much larger than that on the slider surface without the PFAM film as shown in Fig. 6. 

Figure 8 shows the stiction of the sliders at the different stages of the CSS test from the initial cycle to the final cycle, with the PFAM films prepared at different concentrations [26]. There was a 2 h parking after every 5,000 CSS and a 24 h parking at the end of the final 20,000 CSS. Without PFAM film, the stiction increased with the increase of the... 

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