Cracking of drying latex films: an ESEM experiment.
Cracking of drying latex films: an ESEM experiment.
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DOI：
10.1021/la904512q
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发表时间：
2010-02
期刊：
影响因子：
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通讯作者：
K. Dragnevski;A. Routh;Martin W. Murray;A. Donald
中科院分区：
文献类型：
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作者：
K. Dragnevski;A. Routh;Martin W. Murray;A. Donald
在这项研究中，环境扫描电子显微镜被用来观察其玻璃化转变温度以下的干燥乳胶膜的开裂。通过控制相对湿度使其随时间线性降低，可以确定发生开裂的临界湿度水平，并将其作为膜厚度的函数进行测量。据发现，开裂湿度随着膜厚度的增加而减小，厚度在30至100 μ m的范围内，然后几乎保持不变。比例参数可以用来很好地拟合数据，并表明一旦整个膜固结成紧密堆积，就会发生破裂。
In this study environmental scanning electron microscopy was used to observe the cracking of drying latex films below their glass-transition temperature. By controlling the relative humidity so that it decreases linearly with time, a critical level of humidity at which cracking occurs can be determined and this is measured as a function of film thickness. It was found that the cracking humidity decreases with increases in film thickness for thicknesses in the range of 30 to 100 mum and then remains almost unchanged. A scaling argument can be used to fit the data very well and indicates that cracking occurs as soon as the entire film is consolidated into close packing.