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Self-assembled colloid and solvent-responsive property of amphiphilic fluoropolymer for protein-resistance coatings

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Abstract

Amphiphilic fluorocopolymer P (PEGMA)-co-P (DFHM) is prepared by hydrophobic dodecafluorohrptyl methacrylate (DFHM) and hydrophilic poly (ethylene glycol) methyl ether methacrylate (PEGMA) monomers via atom transfer radical polymerization (ATRP). The self-assembled colloids of P (PEGMA)-co-P (DFHM) in ethanol, dimethylformamide (DMF), tetrahydrofuran (THF), and chloroform (CHCl3) solutions are discussed according to solvent dielectric constants (ε = 38.3–4.8). The hydrophilic/hydrophobic property, protein resistance, and adhesive strength of films formed by these colloids are evaluated based on the surface morphologies and chemical compositions. P (PEGMA)-co-P (DFHM) can self-assembly into core-shell micelles composed of P (PEGMA) shell and P (DFHM) core (~130 nm) as 500–600 nm in DMF, 300–400 nm in ethanol, and 200–250 nm in THF and CHCl3 solutions. These colloids provide the film surfaces with high fluorine content (39.40–41.70 wt%) to indicate the migration of fluorine-containing groups onto the film surface during the film formation and therefore the obvious hydrophilic/hydrophobic properties (94.3°–102.4° water contact angles and 58.5°–60.2° cetane contact angles). Comparatively, DMF-casted film gains the highest surface roughness (Ra = 0.98 nm), the lowest fluorine content (39.40 wt%), and the highest surface free energy (20.41 mN m−1) due to its large size of colloids, but CHCl3-casted film gives the lowest surface free energy (17.82 mN m−1). The adhesive strength for DMF- and ethanol-casted films (210 and 168 N) proves higher than THF- and CHCl3-casted films (105 and 63 N), while DMF-casted film shows much better protein resistance (Δf = −15.0 Hz) than other three films (Δf = −17–20 Hz). It is believed that the obtained P (P EGMA)-co-P(DFHM) could have a promising application as solvent-dependent and protein-resistance coatings.

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Authors and Affiliations

  1. Xian Jiaotong University, Xianning West Road, 28, Xian, 710049, China

    Hong Guo & Ling He

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  1. Hong Guo
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  2. Ling He
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Correspondence to Ling He.

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Funding

This work was funded by the National Natural Science Foundation of China (NSFC Grants 51403171, 5157314, 551373133) and the National Basic Research Program of China (973 Program, No.2012CB720904). The authors also wish to express their gratitude for the MOE Key Laboratory for Non-equilibrium Condensed Matter and Quantum Engineering of Xi’an Jiaotong University.

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The authors declare that they have no conflict of interest.

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Guo, H., He, L. Self-assembled colloid and solvent-responsive property of amphiphilic fluoropolymer for protein-resistance coatings. Colloid Polym Sci 295, 827–836 (2017). https://doi.org/10.1007/s00396-017-4065-1

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