DIMENSIONAL STABILITY OF CONDENSATION SILICONE RUBBERS
DIMENSIONAL STABILITY OF CONDENSATION SILICONE RUBBERS
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DOI：
10.1016/0142-9612(92)90058-v
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发表时间：
1992-01-01
期刊：
影响因子：
14
通讯作者：
BRADEN, M
中科院分区：
文献类型：
--
作者：
BRADEN, M
研究了几种专有缩合硅胶口腔印模材料固化后24 h内的线收缩情况。在同一时间段内，通过在空气和水中称重类似的样品来测量重量损失和体积变化。失重数据符合线性t1/2曲线，表明挥发性物质的失重受扩散控制。根据这样确定的扩散系数，根据失重数据预测的线性收缩值与实验结果进行了比较。除高填充油灰材料外，其他材料的理论和实验数据符合较好；对于油灰材料，收缩比理论预测的要大得多。这可能是由于成型油灰材料所产生的弹性记忆效应。
The linear shrinkage during 24 h after setting of a number of proprietary condensation silicone dental impression materials was studied. Weight loss and change in volume were measured over the same time period by weighing similar specimens in air and water. The weight-loss data conformed to a linear t 1/2 plot, indicating that the loss of volatile material was diffusion controlled. From the diffusion coefficient so determined, linear shrinkage values predicted from the weight loss data were compared with the experimental results. For all except the highly-filled putty materials, the correspondence between theoretical and experimental data was reasonable; in the case of the putty materials, the shrinkage was very much greater than that predicted theoretically. This is possibly due to elastic memory effects consequent on moulding the putty materials.