title: Effect of linear elongation of PDMS-supported polyelectrolyte multilayer determined by attenuated total reflectance IR radiation.
abstract: Polyelectrolyte multilayers (PEMs) deposited on flexible supports, such as silicone rubber, show interesting properties upon elongation and release, like controlled wrinkling, elongation-based wetting, or dewetting and stimuli responsive nanovalves. To understand the underlying physical effects of PEM experiencing linear elongation, the orientation change of molecular groups within PEM experiencing linear elongation was investigated. The model PEM consists of polystyrenesulphonate and polydimethyldiallyl chloride. The investigation method was infrared attenuated total reflectance. In the study, the orientation change of the benzene and the sulfate groups of polystyrenesulphonate upon elongation of the PEM, prepared at high and low ionic strengths, was tracked. The gained results show that the benzene group shows no sign of orientation change upon elongation, whereas the sulfate group does, whereby the reorientation depends on the ionic strength of the preparation solution. Upon release of elongation, the PEM prepared at low ionic strength shows no orientation change, whereas PEM prepared at high ionic strength does show further orientation change, indicating that the formed wrinkles elongate the PEM on the top of the wrinkles.
authors: Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, Micro/Nano Technology Research Centre, Harbin Institute of Technology, Yikuang Street 2, Harbin 150080, China. johannes.frueh@hit.edu.cn
authors: Johannes
authors: J
authors: Frueh
authors: Gerald
authors: G
authors: Reiter
authors: Janos
authors: J
authors: Keller
authors: Helmuth
authors: H
authors: Möhwald
authors: Qiang
authors: Q
authors: He
authors: Rumen
authors: R
authors: Krastev