抄録
The purpose of this study was to examine the relationship between the composition and the viscoelastic properties of temporary soft lining materials. The viscoelastic properties were evaluated by the creep characteristics using the Voigt 4-element model.
The findings were as follows:
1. The molecular weight of the powder (PEMA) had a significant effect on the retarded elasticity (E2, η2) and the viscous flow (η3) . These 3 moduli showed a positive correlation with the molecular weight. But, the molecular weight had little effect on the instantaneous elasticity (E1) . The higher the molecular weight was, the greater was the increasing tendency of the value of η3with the ageing time.
2. The particle size of the powder affected only the instantaneous elasticity (E1) . This modulus showed a negative correlation with the particle size.
3. The difference in the plasticizer in the liquid had a significant effect on all moduli. The values of the material using BPBG were larger than those of the material using BB.
4. The amount of the plasticizer in the liquid had a significant effect on all moduli. However, the amount of the plasticizer did not affect the changes in the values with the ageing time.
5. The amount of ethanol in the liquid affected the values of all moduli at 8 hours after mixing. The material with a large amount of ethanol showed low values. The material with a large amount of ethanol showed a higher increasing tendency in the values with the ageing time.
