Surface energy and surface reorganization of perfluorohexylethyl methacrylate/n-alkyl (meth)acrylate copolymers

Add time:08/09/2019    Source:sciencedirect.com

In this work, we report on surface energy and surface reorganization behaviors of a series of fluorinated copolymers poly(perfluorohexylethyl methacrylate)-co-poly[n-alkyl (H or methyl)acrylate], abbreviated as P13FMA-co-P(AnA) or P13FMA-co-P(AnMA), as a function of the lengths of non-fluoroalkyl group in the pendent groups of the comonomers and the presence of hydrogen (H) or methyl (CH3) in the α-position of comonomers. Although the different copolymers that were derived from various comonomers formed different fluorine-enriched concentrations on the gas-solid interface, the increasing chain lengths of the alkyls have less impact the surface energy of the fluorinated copolymers. The methyl at the α-position of methacrylate monomer results in the significant increase of surface energy. The dynamic contact angle measurements show that the surface reorganization of the fluorinated chains are directly associated with the Tg or Tm of these copolymers. For P13FMA-co-P(AnMA) system, it has higher Tg and lower surface reorganization. However, when the carbon numbers (n) of the alkyl in comonomers are larger than 12, P13FMA-co-P(AnA) shows higher Tm and smaller hysteresis contact angle, as well as more stable low surface energy, compared to those of P13FMA-co-P(AnMA).

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