Nanoindentation of Films of Perfluorotridecyl, Perfluorodecyl, and Perfluoroheptyl End‐Functionalized Polystyrene at the Micron Scale

Abstract

Polystyrenes (PS) end-functionalized with perfl uorotridecyl (PFTD), perfl uorodecyl (PFD), and perfl uoroheptyl (PFH) groups are synthesized using the corresponding perfl uoroalkyl initiators by atom transfer radical polymerization. Polymer thin fi lms deposited on silicon wafers are studied by dynamic nanoindentation (NI). NI measurements of the 15k PFTD-PS sample showed increases of about 80 and 300% in the storage and loss moduli, respectively, compared to the 15k PS homopolymer. Measurements made on different regions of the PFTD-functionalized PS show a fi vefold greater standard deviation compared to the 15k PS homopolymer. The effects for the PFD and PFH groups are smaller in all respects consistent with expectations.

Nitroxide-Containing Amphiphilic Random Terpolymers for Marine Antifouling and Fouling-Release Coatings

“…Monomethacryloxypropyl-terminated polydimethylsiloxane ( M n = 1000 g mol –1 , PDMSMA), purchased from Gelest, and poly­(ethylene glycol) methyl ether methacrylate ( M n = 500 g mol –1 , PEGMEMA), purchased from Sigma-Aldrich, were passed through a basic alumina column to remove the inhibitor. 17F-EBiB was synthesized as previously described in the literature. − For coating fabrication, bissilanol-terminated PDMS ( M n = 26,000 g mol –1 , HO-PDMS-OH) and polydiethoxysiloxane ( M n = 134 g mol –1 , ES40) were purchased from Gelest; bismuth neodecanoate (BiND) and tetra- n -butylammonium fluoride (TBAF), purchased from Sigma-Aldrich, were used as received.…”