Investigations on the permeability of acrylic powder structures

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2003

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Ağırtopçu, Yasin

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There are many examples where creation and usage of porous substrates play important roles in various fields of application in material science and technology. In the manufacture of ceramic products, as an alternative to the plaster molds, porous resin molds are used İn order to resolve the drawbacks that result from plaster mold cementation. A porous substrate can be produced by various ways. In this study, porous polymeric matrices of pofy(methyl methacrylate) (PMMA) and poh/(methyl methacrylate-co-2-hydroxyethyl methacrylate) [poly(MMA-HEMA)j polymers were prepared by connecting the polymer microspheres to each other by an epoxy adhesive. To improve the surface properties, methyl methacrylate (MMA) was copolymerized with 2-hydroxyethyl methacrylate (HEMA). The microspheres used were synthesized by suspension polymerization and characterization was indone by Nuclear Magnetic Resonance (NMR), Particle Size Analyzer and Scanning Electron Microscope (SEM). The porous samples were prepared with PMMA and poly(MMA-HEMA) copolymer microspheres with two different HEMA contents and their surface energies were measured. In addition, the effect of mean particle diameter of the microspheres used and the epoxy content of the solution used to bind the microspheres, on the impregnation capacity, morphology and the impact strength of the porous samples prepared, were studied. Inclusion of HEMA into the formulation improved the impregnation capacity of the samples. Using microspheres with narrower particle size distribution resulted in larger representative capillary radii and higher rate of impregnation of the samples. Increasing the epoxy content of the solution used to bind the beads, increased the impact strengths of the samples prepared.

Subject Keywords

Polymers and polymerization, Sphere packing, Porous polymeric matrices, Surface energy, Capillary impregnation

URI

https://hdl.handle.net/11511/13774

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Y. Ağırtopçu, “Investigations on the permeability of acrylic powder structures,” M.S. - Master of Science, Middle East Technical University, 2003.