Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 24: Poster Session I
CPP 24.24: Poster
Monday, March 16, 2020, 17:30–19:30, P3
Versatile approach to well-defined conjugated oligomers and polymers with narrow molecular weight distribution for fundamental studies on structure-property relationships — •Frank-Julian Kahle1, Julia Wollmann2, Irene Bauer2, Anna Köhler1, and Peter Strohriegl2 — 1Soft Matter Optoelectronics, University of Bayreuth, Germany — 2Macromolecular Chemistry I, University of Bayreuth, Germany
In this work, we present a versatile approach to achieve well-defined conjugated polymers and oligomers from a single standard synthesis route via preparative Size Exclusion Chromatography. Using a special recycle mode and well-defined end-cappers, we are able to prepare pure oligomers with three to eight repeat units and high molecular weight polymers with dispersity D as low as 1.06 in just one preparation step with reasonable yield. To demonstrate the capabilities of our method, we conducted a fundamental spectroscopic study on the influence of chain length and molecular weight distribution on electronic properties and aggregation behavior of a series of fluorene based oligo- and polymers. Due to the well-defined nature of the investigated compounds we consistently find a first-order phase transition and an increase of the critical transition temperature from amorphous to β-phase as function of the number of repeat units in accordance with the Sanchez model on coil-globule transitions.