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Thermosensitive Polymer Biocompatibility Based on Interfacial Structure at Biointerface
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DOI：10.1021/acsbiomaterials.8b00081.png)
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The interfacial structure of a thermosensitive biocompatible polymer, poly[2-(2-methoxyethoxy)ethyl methacrylate] (PMe2MA), at the polymer/phosphate-buffered saline (PBS) interface was investigated by atomic force microscopy. A number of nanometer scale protrusions appeared at 37 degrees C and disappeared at 22 degrees C, reversibly. This structural change occurred above the lower critical solution temperature of PMe2MA in PBS (19 degrees C), indicating that the formation of protrusions was explained by the microphase separation of polymer and water at the interfacial region. The protein adsorption and platelet adhesion onto PMe2MA interface were drastically restrained at 22 degrees C compared to that at 37 degrees C. Detachment of NIH3T3 cells accompanied by the dissipation of protrusions on the PMe2MA interface was also demonstrated. These results indicate that the protrusions act as the scaffold for the protein adsorption and cell adhesion.
Keyword:
biocompatible polymer
interface
atomic force microscopy
intermediate water
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