DYNAMIC VISCOELASTICITY DURING SOL-GEL REACTIONS
DYNAMIC VISCOELASTICITY DURING SOL-GEL REACTIONS
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DOI：
10.1016/0022-3093(91)90702-8
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发表时间：
1991-06-01
影响因子：
3.5
通讯作者：
AMIS, EJ
中科院分区：
文献类型：
--
作者：
HODGSON, DF;AMIS, EJ
在凝胶化反应过程中的粘弹性的演变正硅酸乙酯解决方案已被监测从初始反应物混合通过溶胶-凝胶转变与多集总谐振器仪器。 凝胶点是通过在反应的奇异程度下观察与频率无关的损耗角正切来确定的。 G'和G”的频率依赖性可以与最近的理论模型和模拟进行比较。 对明胶的化学凝胶和物理凝胶的结果进行了比较。 同样，频率无关损耗角正切的出现对应于宏观凝胶点。
The evolution of viscoelasticity during the gelation reactions of tetraethoxysilane solutions has been monitored from initial reactant mixing through the sol-gel transition with the multiple lumped resonator instrument. Gel points are determined by the observation of a frequency-independent loss tangent at a singular extent of reaction. The frequency dependence of G' and G" can be compared with recent theoretical models and simulations. Comparisons are made between the results for the chemical gel and the physical gel of gelatin. Again the occurrence of a frequency independent loss tangent corresponds to the macroscopic gel point.