A very important property of O/W microemulsions is the exchange dynamics of the oil molecules. So far little is know about that, despite the fact that its control is crucial for many applications. Here the oil exchange will be studied by using stopped-flow SANS and mixing rapidly otherwise identical nonionic O/W microemulsions containing deuterated or hydrogenated oil. By this method the rate of oil exchange will be followed and the aim of this project is to study how it is slowed down by the addition of bridging telechelic polymer, this system having been studied in detail before. In the SANS sf-experiments we will vary the number of hydrophobic stickers, the number of arms, and the length of the hydrophobic sticker. By doing so we will learn how the architecture of the polymers allows to control the oil exchange in such microemulsions, thereby allowing to optimise such formulations.