マイクロ波重合用レジンに関する基礎的研究
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概要
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The composition, polymerization, mechanical properties and the porosity occuring of commercial microwave cured (MC) resin, heat-cured (HA) resin, and the experimental PMMA-MMA resins were investigated. The starting temperature for the polymerization of MC-resin was lower than that of HA-resin and its exothermic curve was the same as that of the experimental resin with a redox catalyst. The starting temperature for the polymerization of the experimental resins decreased with increasing the concentration of BPO or by the use of the redox catalyst. The average molecular weights of the experimental resins with BPO were lower than those of experimental heat-curing resin, but the molecular weights increased by the use of the redox catalyst. The experimental resins with BPO showed lower mechanical strength than the experimental heat-curing resin. However, the experimental resins with the redox catalyst had a mechanical strength equal to or higher than that of the experimental heat-curingresin.The porosity occuring was increased with increasing the concentration of BPO, the microwave irradiation time and the thickness of cured product. However, it was suppressed by the use of the redox catalyst. Cross-linking agents of more than 5 wt.% also suppressed the porosity occuring.
- 1991-03-31