Study on novel composite resin with a low shrinking force during hardening

1.设计了交联单体在乙醇中溶液聚合制备交联聚合物微粒的新方法，并对其聚合机理进行了探讨.将直径为0.5 μ m的交联聚合物颗粒与微球二氧化硅颗粒（MF）混合。使用混合填料制备热固化型树脂。硬化后测定其磨损量.采用上述方法设计了含微胶囊的交联聚合物微胶囊颗粒。以MCPF和MF为填料制备了自固化型复合树脂，并对其固化后的力学性能进行了测试.以MCPF、不规则白炭黑和球形白炭黑为填料，制备了四种自固化型复合树脂。复合树脂在硬化过程中的收缩力是用去年准备的测量树脂在硬化过程中收缩力的装置测量的。研究了复合树脂中二氧化硅填料的形状、尺寸和含量对收缩力的影响。5 -1基于不规则二氧化硅的复合树脂的收缩力大于基于球形二氧化硅的复合树脂的收缩力。5 -2球形二氧化硅颗粒的含量高于作为填料的不规则二氧化硅颗粒。但收缩力随二氧化硅含量的增加而增大。5 -3随着二氧化硅粒径的增大，收缩力变小。5 -4随着树脂固化时间的推迟，收缩力变小。5 -5利用上述数据讨论了复合树脂固化过程中收缩力的控制参数。

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.