2-hydroxyethyl methacrylate experimental materials

The chemical composition, dimensions and the molecular parameters of four dental acrylic polymer materials and two polyacrylic acids of different molec.wt. used as model compounds were studied by NMR and IR spectroscopies, GPC, intrinsic viscosity and light scattering measurements. Two of the dental polymers were shown to be mainly polyacrylic acid, while one showed the peak pattern for an acrylic acid/methyl acrylate copolymer of about 2 1 composition and one was an oligomer derived from 2-hydroxyethyl methacrylate. The steric hindrance parameter, molecular stiffness and second virial coefficient were calculated using different thermodynamic models. The Flory-Fox-Shafgagen and the Stockmayer-Fixman models fitted the experimental data reasonably well and could be use to describe the molecular parameters of the acrylic polymers. 18 refs. (7th International Conference on Polymer Characterization (POLYCHAR-7), Denton, Texas, USA, Jan. 1999)... 

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