An in situ silicone–silicone interpenetrating polymer network (IPN) with higher mechanical property, higher hydrophilicity, and lower protein adsorption
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As medical materials, silicone polymers are poor in mechanical properties and in resistance to fouling for its non-specific adsorption of proteins, cells, etc. This paper introduces a new type of silicone–silicone interpenetrating polymer network (IPN) composing of two curing reactions: One was radical coupled reaction, and the other was ring opening of epoxy by amino groups. The IPN were characterized by Fourier transform IR spectroscopy (FT-IR), dynamic mechanical analysis, cross section scanning electron microscope, and mechanical property. IPN structure could be formed in a co-continuous phase, while the sea–island phase could be also found up to amino content, and then tear strength and elongation at break were obviously increased. ATR FT-IR, X-ray photoelectron spectroscopy, and static water contact angles confirmed that IPN surfaces showed the hydrophilicity dependent on surface amino-epoxy component. The static water contact angles were greatly decreased to the lowest 69.3°. Both qualitative and quantitative bovine serum albumin (BSA) adsorption assay confirmed that, compared with pure polydimethylsiloxane, BSA adsorption on IPN substrates were greatly decreased, with the most 85%.
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Conflict of interest
The authors declare that they have no conflict of interest.
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