Fakhraai Z, Valadkhan S, Forrest J A
Department of Physics and Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario, Canada.
Eur Phys J E Soft Matter. 2005 Oct;18(2):143-8. doi: 10.1140/epje/i2004-10158-1. Epub 2005 Oct 7.
We have used ellipsometry to measure the initial stages of interface healing in bilayer polystyrene films. We also used ellipsometry to measure the glass transition temperature T(g) of the same or identically prepared samples. The results indicate that as the film thickness is decreased, the time constant for the interface healing process increases, while at the same time the measured glass transition temperature in the same samples decreases as the film thickness is decreased. This qualitative difference in the behavior indicates that it is not always possible to make inferences about one probe of polymer dynamics from measurements of another. We propose a reason for this discrepancy based on a previously discussed origin for reduction in the T(g) value of thin films.
我们使用椭圆偏振光谱法来测量双层聚苯乙烯薄膜界面愈合的初始阶段。我们还使用椭圆偏振光谱法来测量相同或相同制备样品的玻璃化转变温度T(g)。结果表明，随着薄膜厚度的减小，界面愈合过程的时间常数增加，而与此同时，相同样品中测得的玻璃化转变温度随着薄膜厚度的减小而降低。这种行为上的定性差异表明，从另一项测量中推断聚合物动力学的一个探针并不总是可行的。基于之前讨论的薄膜T(g)值降低的起源，我们提出了这种差异的一个原因。
