Novel Polymeric Materials with Double Porosity: Synthesis and Characterization

摘要

This paper reports on two straightforward and versatile routes to functional doubly porous polymeric materials based on cross-linked poly(2-hydroxyethyl methacrylate) (PHEMA) via novel porogen templating methodologies. The quantitative removal of either CaCO3 particles or poly(methyl methacrylate) beads as macroporogens, in conjunction with either hydroxyapatite nanoparticles or a solvent as nanoporogens, led to the generation of macropores with dimensions in the 100 mmrange, while the second porosity lied within the 1 mm order of magnitude, as evidenced by mercury intrusion porosimetry and scanning electron microscopy. The successful functionalization of such doubly porous PHEMA-based frameworks was implemented through a straightforward two-step chemical modification involving an activation stage, followed by the coupling of propargylamine as a model compound. Raman spectroscopy clearly indicated the occurrence of alkyne functionality within the biporous materials.