| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1991: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1990: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
1. Novel method was designed to obtain the micro cross-linked polymer particle using solution polymerization of cross-linking monomer in ethanol, and it's polymerization mechanism was clarified.
2. The cross-linked polymer particle whose diameter is 0.5mum, was mixed with the micro globule silica particle (MF). The resin of a heat-cured type was prepared using the mixed filler. After hardening, it's abrasion loss was measured.
3. The micro capsule particle (MCPF) of the cross-linked polymer containing the MF was designed using the method as mentioned above. The composite resin of a self-cured type was prepared using MCPF and MF as filler, and the mechanical properties of it's hardening was measured.
4. Four kinds of composite resins of a self-cured type was prepared using MCPF, an irregular silica or a globule silica as filler. The shrinking force of the composite resin during hardening was measured with the apparatus which was prepared last year to measure the shrinking force of a resin during hardening.
5. The effect of the shape, the size and the content of silica filler in composite resin on the shrinking force was investigated.
5-1 The shrinking force of the composite resin based on an irregular silica is larger than that based on a globule silica.
5-2 The content of a globule silica particle is higher than an irregular silica particle as filler. However, the shrinking force increases with increasing the silica content.
5-3 As the size of silica is larger, the shrinking force become smaller.
5-4 As the setting time of resin become later, the shrinking force become smaller.
5-5 The parameter to control the shrinking force of composite resin during hardening is discussed using the datas as mentioned above.
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