Abstract
Experimental soft lining materials were produced using poly Ethyl methacrylate (PEMA), poly n-Butyl methacrylate (PnBMA) or poly iso-Butyl methacrylate (PiBMA) powders and liquid plasticizers added Ethyl methacrylate (EMA) or Butyl methacrylate (BMA) monomer. The powders and liquids were mixed for 30 sec and then mixtures were light-cured after 24 hrs from the start of mixing. This investigation examined the effect of differences in kinds and mixing ratios of monomers and plasticizers to improve the durability of acrylic soft lining materials. We used a viscometer to evaluate apparent viscosity, a pulsating rheometer for elastic recovery and experimental hardness tester for hardness and stress relaxation. As a result, compositions that are applicable as soft lining materials were less than 30% EMA with PEMA-DBP type, less than 20% EMA with PEMA-BPBG type and less than 10% BMA with PiBMA-DBP and PiBMA-BPBG type.
