Abstract
Polyblend powders, which were mechanically blended into polymethyl-methacrylate(PMMA), were produced using two thermoplastic elastomers(syndiotactic 1, 2polybutadiene(BR)and stylene-isoprene-stylene(SIS)).Using there powders, conventional polymerization was carried out.For ten materials obtained according to the conventional curing technique, dynamic viscoelastic properties(G'and η'), coefficient of thermal expansion, water absorption, residual monomer(MMA)and impact strength were examined.G'(dynamic shear modulus)decreased 26% compared with that of PMMA in a temperature range from room temperature(23±1.0℃)to 100℃.η'(coefficient of dynamic viscosity)also decreased and its rate of decrease was 30.8%.Although the amounts of thermal expansion of both materials(blended with BR and SIS)were less than that of PMMA in air, there were no significant difference between polyblends and PMMA.On the other hand, the amounts of thermal expansion and residual monomer increased gradually with the increase of elastomer.Furthermore, bending strength and strain energy were also increased, and impact strength of their materials was markedly improved.
