Abstract
Molecular composities are prepared by dispersion of rigid molecules into a matrix resin for reinforcing resins.In this study, polyfunctional siloxane oligomers with ladder-like structures were used as rigid molecules which were obtained by cohydrolysis of variety ratio of γ-methacryloxypropyl trimethoxysilane and phenyl triethoxysilane.Physical properties of PMMA composites which contained 10 and 20wt% of the siloxane oligomer were measured and compared with the composites containing the same amount of polyfunctional methacrylates, such as 3G, Bis-GMA and TMPT-MMA copolymers.Compressive strength of the composites containing 20wt% of the oligomers was higher than that of the Bis-GMA-MMA copolymer, and increased with the content of double bonds in the siloxane oligomer.Hardness of the composites was higher than that of the 3G-MMA copolymer, and was almost same as that of the Bis-GMA and TMPT-MMA copolymers.Water sorption was lower than that of the other PMMA copolymers.Based on the results obtained, it is expected that molecular composites of the siloxane oligomer-PMMA will be used as materials for crown and brige, other PMMA copolymers.
