Model of the polymer chain twisted inside a statistical segment. Poly-3-hexylthiophene in chloroform solutions

The set of hydrodynamical methods in extremely diluted solutions (determination of intrinsic viscosity [η], translational diffusion D and flotation in a centrifugal field s) was used in the studies of conformational properties, dimensions and equilibrium rigidity of individual molecules of a series of samples of poly(3-hexylthiophene). Absolute molecular masses MsD were determined. The Mark-Kuhn-Houwink equations for the range of MsD from 2240 g mol−1 to 15300 g mol−1 are given. For the first time, the analysis of conformational properties and equilibrium flexibility of poly(3-hexylthiophene) molecules was carried out using the model of a statistical segment containing a twisted polymer chain.