Institute of Physical Chemistry, Clausthal University of Technology , D-38678 Clausthal-Zellerfeld, Germany.
Langmuir. 2013 Sep 10;29(36):11317-21. doi: 10.1021/la402121j. Epub 2013 Aug 29.
Using an experimental setup which determines the turbidity of the sample and the efficiency of Förster resonance energy transfer (FRET) at the same time, we have correlated the particle deformation kinetics in a drying latex film, quantified by light scattering with the kinetics of polymer interdiffusion. Interdiffusion was quantified making use of energy transfer (FRET) between donor molecules and acceptor molecules, bound to polymer chains on different particles. When the chains cross the interparticle boundaries, the rate of energy transfer increases. The latex was prepared by miniemulsion polymerization. The amount of emulsifier employed during polymerization had a pronounced effect on the relative timing of interdiffusion and particle deformation. Increasing the amount of emulsifier delayed the onset of interdiffusion relative to the time when the film became transparent. This is mostly the consequence of a size effect, as opposed to surfactant acting as a barrier for transport.
利用一种能够同时测定样品浊度和Förster 共振能量转移（FRET）效率的实验装置，我们将用光散射测定的干燥乳胶膜中粒子变形动力学与通过聚合物扩散定量测定的动力学关联起来。利用结合在不同粒子聚合物链上的供体分子和受体分子之间的能量转移（FRET）来定量测定扩散。当链穿过粒子间边界时，能量转移的速率增加。乳胶是通过细乳液聚合制备的。聚合过程中使用的乳化剂的量对扩散和粒子变形的相对时间有显著的影响。与膜变得透明的时间相比，增加乳化剂的量会延迟扩散的开始。这主要是由于尺寸效应的结果，而不是表面活性剂作为传输的障碍。
