Creep Behavior of Polymer Thin Films Studied by Buldge Test

膨胀测试技术可以通过测量对薄膜圆形窗口施加受控压力而形成的变形来确定聚合物薄膜的机械性能。设计了聚合物薄膜的膨胀性测试装置，并将其应用于各种聚合物薄膜的鼓泡试验。通过将压力-位移关系与简单的力学模型进行比较，可以测量薄膜的弹性模量和断裂应力。鼓包试验清楚地观察到断裂时的大变形。虽然鼓包测试技术非常有效，但由于样品安装和精确的鼓包高度测量等困难，该技术并未被常规使用。

The bulge testing technique can determine the mechanical properties of polymer thin films by measuring the deformation that forms in response to the application of a controlled pressure to a thin film circular window. The bulge testing for polymer thin film was designed and was applied to various polymer thin films. By comparing the pressure-displacement relation with a simple mechanical model, the elastic modulus and rupture stress in the thin film can be measured. Large deformation at rupture was clearly observed by buldge test. Though the bulge testing technique is quite effective, this technique is not routinely used because of difficulty including specimen mounting and precise bulge height measurement.