In situ small angle x-ray scattering measurements of the filling process of polyisobutylene and poly-ε-caprolactone in ion track etched polycarbonate nanopores
In situ small angle x-ray scattering measurements of the filling process of polyisobutylene and poly-ε-caprolactone in ion track etched polycarbonate nanopores
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DOI：
10.1063/1.3429312
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发表时间：
2010-06-14
影响因子：
4.4
通讯作者：
Stuehn, B.
中科院分区：
文献类型：
--
作者：
Engel, M.;Stuehn, B.
我们介绍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，它们被疏水性聚异丁烯和亲水性聚ε -己内酯填充。利用小角x射线散射对充填过程进行了原位研究。利用基于Lucas-Washburn方程的模型函数研究了液体在圆柱形孔隙中填充过程的散射强度随时间的变化规律。模型函数在填充高度的根t依赖性方面定性地描述了数据，但明显偏离了块状材料特性的预期定量值。此外，还观察到前驱体膜在短时间尺度上润湿纳米孔表面。(C) 2010年美国物理研究所。(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 root 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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3429312]