Department of Solid State Physics, Technische Universitat Darmstadt, Darmstadt 64291, Germany.
J Chem Phys. 2010 Jun 14;132(22):224502. doi: 10.1063/1.3429312.
We present results of in situ measurements of the filling process of polymer melts in nanopores. After accurate characterization of the empty nanopores, they are filled with the hydrophobic polyisobutylene and the hydrophilic poly-epsilon-caprolactone. The filling process is investigated in situ with small angle x-ray scattering. The time-dependent scattering intensity is investigated with a model function based on the Lucas-Washburn equation for the filling process of liquids in cylindrical pores. The model function describes the data qualitatively well in terms of a t-dependency of the filling height, but deviates clearly from the expected quantitative values of the bulk material properties. Furthermore, the occurrence of a precursor film wetting the nanopore surface on a short time scale is observed.
我们呈现了聚合物熔体在纳米孔中填充过程的原位测量结果。在对空纳米孔进行精确表征后，用疏水性聚异丁烯和亲水性聚己内酯填充。采用基于 Lucas-Washburn 方程的圆柱孔中液体填充模型函数，对原位填充过程进行小角度 X 射线散射研究。用一个基于 Lucas-Washburn 方程的模型函数对随时间变化的散射强度进行研究，该模型函数可以很好地描述填充高度随时间的变化关系，但与预期的块状材料性质的定量值有明显偏差。此外，还观察到在短时间内形成了一个浸润纳米孔表面的预成膜。
