Abstract
Monitoring and understanding monomer conformational changes as substituents are varied is an important step in investigating in situ polymerization and controlling the polymerization process as well as regulating the functionality of polymer surfaces to provide efficient polymer coatings. In this study, the preliminary stage involves characterization of the interfacial structures of methacrylate-based functional monomers and their polymer thin films at the air–liquid interface using femtosecond sum frequency generation spectroscopy (FSFGS). By varying the substituted ethyl group of the methacrylate monomers with hydroxy (−OH), chloro (−Cl), and phenoxy (−OPh), the alpha-methyl (α-CH3), alkene-methylene (alkene-CH2), and methylene (CH2) groups are observed to have preferential surface ordering toward the air interface. A peak positioned at ∼3000 cm–1 was observed in the spectrum of the 2-hydroxyethyl methacrylate (HEMA) monomer and assigned to alkene-CH2 group. This functional group signifies that the pure...
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