DEGREE OF DOUBLE-BOND CONVERSION IN LIGHT-CURED COMPOSITES
DEGREE OF DOUBLE-BOND CONVERSION IN LIGHT-CURED COMPOSITES
复制标题
DOI：
10.1016/s0109-5641(87)80055-6
复制
发表时间：
1987-02-01
期刊：
影响因子：
5
通讯作者：
CAPUTO, AA
中科院分区：
文献类型：
--
作者：
ELIADES, GC;VOUGIOUKLAKIS, GJ;CAPUTO, AA
研究了5种商用光固化复合材料的固化规律。采用微atr红外光谱法评价固化程度与暴露表面距离和固化时间的关系。还获得了每个深度的KHN测量值，以将硬度模式与转换程度联系起来。采用DSC对各体系的后固化效率进行了研究。结果表明，微填充材料的固化深度越小，未转化键的数量越大，且随暴露时间和距离的增加而增加。固化深度、硬度模式和固化模式随着无机载荷的增加而延长。填料分数的热容量影响固化程度。由于死端聚合效应，在固化后24小时观察到热诱导聚合的巨大损失。
The curing pattern of five commercial light-cured composites was investigated. Micro-ATR infrared spectroscopy was used to evaluate the degree of cure as a function of distance from the exposed surface and curing time. KHN measurements were also obtained for each depth to relate the hardness pattern to the degree of conversion. The post-curing efficiency of each system was studied by DSC. The results indicate that microfilled materials present smaller depth of cure and higher amount of unconverted bonds as a function of distance and exposure time. Depth of cure, hardness pattern and curing pattern are extended with increased inorganic loading. The thermal capacity of the filler fraction influences degree of cure. A great loss in the heat induced polymerization is observed 24-h post curing, attributed to the dead end polymerization effect.