Studies on particle size for microwave curing composite resin.

微波固化复合树脂粒径的研究

• 批准号: 08672191
• 负责人: URABE Hidenori
• 金额: $ 0.38万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08672191/
• 关键词: Post-cure; Microwave; particle size; マイクロ波; 粒度分布; 後重合; コンポジットレジンインレー

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.

作为微波聚合复合树脂的发展，研究了后固化的影响。结果，作为后固化，微波照射比仅可见光照射的时间表现出更稳定的内部结构。虽然照射固化样品的活化能在微波3分钟时显示最大值，但随着微波照射时间的延长，C=C的转化率变得良好。对于Bis-GMA和TEGDMA，分子量69和113的部分不稳定。并且，已确认它是最先能够发生分解和蒸发的部分。固化样品的机械性能通过微波辐射得到改善，并且辐射在三分钟内显示出最大值。然而，推测在照射三分钟或更长时间时已引起低分子量聚合物和结构变化。填料添加的影响测量颗粒度分布和比表面积作为填料的特性。当添加呈现以平均粒径为中心的规则分布的填料时，本研究使用的三种高纯球状二氧化硅填料表现出最大的机械特性值。因此，表明具有粒度分布的填料添加不会影响效果。另外，通过电子显微镜观察确认了基础单体与填料连接的部分以及裂纹。

项目成果

Urabe, H.: "Influence of Polymerization Initiator for Base Monomer on Microwave Curing" Journal of Oral Rehabilitation. (in press). (1998)

Urabe, H.：“基础单体聚合引发剂对微波固化的影响”口腔康复杂志。