Characterisation of macroporous poly(methyl methacrylate) coated with plasma-polymerised poly(2-hydroxyethyl acrylate) |
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Authors: | A Serrano Aroca JL Gómez Ribelles M Monleón Pradas A Vidaurre Garayo |
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Institution: | a Center for Biomaterials, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain b Centro de Investigación Príncipe Felipe, Avd. Autopista del Saler 16, 46013 Valencia, Spain |
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Abstract: | Macroporous poly(methyl methacrylate) networks with varying cross-linking density and porosity were coated with plasma-polymerised poly(2-hydroxyethyl acrylate) grafted on the pores surface. The result is a mechanically reinforced hydrogel (PMMA-gr-plPHEA) whose properties are characterised in this work using several experimental techniques. Bulk PMMA and bulk PHEA were also characterised as reference materials. The diffusion and water sorption properties of these hydrogels were studied through equilibrium water sorption isotherms and desorption starting with the sample equilibrated in immersion in liquid water or in a vapour atmosphere. Glass transition, dynamic-mechanical relaxation and thermal degradation were characterised in order to study the interphase interaction in these biphasic systems. All these experimental techniques suggested that plasma-polymerised PHEA is more homogeneously interpenetrated with highly cross-linked macroporous PMMA than if the porous substrate is a loosely cross-linked polymer network. |
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Keywords: | Porous hydrogels Water sorption Diffusion Differential scanning calorimetry Dynamic mechanical spectroscopy Thermogravimetry |
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