Studies on particle size for microwave curing composite resin.

考察了后固化对微波高分子复合树脂性能的影响。结果表明，微波辐照在后固化过程中表现出比仅可见光照射更稳定的内部结构。随着微波辐照时间的延长，C=C的转化程度变得很好，但辐照固化样品的活化能在微波照射3分钟时达到最大值。Bis-GMA和TEGDMA分子量为69和113的部分不稳定。而且，它被证实是第一个能够发生分解和蒸发的部分。微波辐照改善了固化试样的力学性能，辐照时间为3 min时达到最大值。然而，猜测低分子量聚合物和结构的变化是在照射3分钟或更长时间后引起的。填料添加量对填料颗粒度分布和比表面积的影响是填料性能的重要指标。当添加以平均粒径为中心的规则分布填料时，本研究使用的三种高纯硅溶胶填料的力学特性值最大。因此，认为颗粒度分布不偏的填料添加效果最好。并对基体与填料连接的部位及裂纹进行了电镜观察。

The influence of Post-cure was examined as a development of micro wave polymeric composite resin.As a result, the micro wave irradiation showed steadier internal structure than the time only of visible light irradiation as Post-cure. The degree of conversion of C=C became excellent as the micro wave irradiation time lengthened though the activation energy of the cured sample of the irradiation indicated the maximum value for the micro wave three minutes.As for Bis-GMA and TEGDMA,the part of molecular weight 69 and 113 was unstable. And, it was confirmed that it was the first part where decomposition and evaporation were able to happen. The mechanical character of the cured sample improved by the micro wave irradiation and the irradiation indicated the maximum value for three minutes. However, it was guessed that polymer of low molecular weight and structural change had been caused in the irradiation for three minutes or more.The influence the filler addition measured the grain degree distribution and the ratio surface area as a character of filler. When filler which showed regular distribution which centered on averge particle size was added, three kinds of high pure sherical silica filler used for this research indicated the value with the biggest mechanical character. Therefore, it was suggested that the filler addition which had the grain degree distribution not biased the effective. Moreover, the parts which the base monomer connected with filler and the cracks were admitted by the electronic microscope obserevation.