Institute of Physical Chemistry > Research > Film formation studied with FRET

Film formation studied with FRET

Film formation from polymer dispersions studied with Förster resonance energy transfer (FRET)

Stage III of the film formation process is polymer interdiffusion. If the different chains are suitably labeled with dyes, and if, further, the different chains intermix, energy is transferred from the donor to the acceptor.

Polymer films are often prepared from water-borne polymer dispersions. The film formation process starting from polymer dispersions encompasses three steps, which are water evaporation, particle deformation, and polymer interdiffusion.  Polymer interdiffusion is important for cohesion of the final film. During interdiffusion, particle boundaries disappear, while polymer chains from adjacent particles mix and form entanglements.

The group employs Förster resonance energy transfer (FRET), a fluorescence technique, to track interdiffusion.  Currently, we work together with BASF SE, investigating the interdiffusion in water-borne pressure-sensitive adhesives (PSAs).  PSAs consist of soft, slightly cross-linked chains.  In the materials currently under study, ionic cross-links are formed during interdiffusion.  Since ionic cross-links can be reversible, they allow for self-healing. Making use of FRET, it was proven that polymer interdiffusion indeed takes place in these materials. Cross-linking was confirmed by mechanical testing.


Persons:
Hares Wahdat
,
Jörg Adams,
Prof. Diethelm Johannsmann

 

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