Synthesis and characterization of semifluorinated polymers and block copolymers

Abstract

The goal of the investigation presented here was to evaluate the influence of semifluorinated side chains on the bulk structure and the surface properties of polysulfones with different chain structure. Thus, segmented block copolymers consisting of polysulfone and semifluorinated aromatic polyester segments as well as polysulfones having semifluorinated side chains randomly distributed over the polymer backbone were synthesized and characterized. Oxydecylperfluorodecyl side chains were used because of their strong tendency for self‐organization. The influence of the chain architecture on the self‐organization as well as on the surface properties, particularly the wetting behavior, was examined. It could be shown that despite of the higher self‐organizing tendency of block copolymers the surface properties of both polymer types are comparable and depend only on the concentration of side chains.

Molecular dynamics in semifluorinated side-chain polyesters as studied by broadband dielectric spectroscopy

“…All polymers under discussion were synthesized by transesterification polycondensation in the melt, using for the fully aromatic polymers 1e2 transacetylation polycondensation [6,8] and for the semiaromatic polymers 3e8 transesterification of dimethyl esters with the aliphatic diols [10,17]. The chemical characterization of the polymers used for the current investigation is summarized in Table 2.…”

“…If such semifluorinated segments are attached to polymeric backbones, the microphase separation of the semifluorinated segments can often be maintained assuming that the number of C-atoms in the semifluorinated (SF) segments (in both alkyl and perfluoroalkyl parts) is above a critical value. This is demonstrated for a set of polymers with varying polymer backbones and different semifluorinated side chains, for instance semifluorinated polystyrene [3], polystyreneepolyisoprene diblock copolymers [4], polymethylmethacrylate [5], polyesters [6e9], polysulfones [10], segmented polyestere polysulfone block copolymers [11,12] and others. In special cases where the semifluorinated side chains are long enough, the ordered solid-state results in the formation of a wellorganized surface structure, resulting in polymeric materials with extremely low surface free energy [13e16].…”

“…We studied the thermal properties and the molecular dynamics of polyesters with systematic variation of the polymer backbone while keeping the semifluorinated side chains constant, thus comparing the influence of semifluorinated side chains on fully aromatic and semiaromatic polyester main chains. Long oxydecylperfluorodecyl segments [eOe(CH 2 ) 10 e (CF 2 ) 9 eCF 3 ] were chosen as semifluorinated side chains to have a strong driving force for microphase separation, as demonstrated before [6,9]. The principal chemical structure of the polymers investigated is outlined in Fig.…”

Flow cytometry detection of Shiga toxins in the blood from children with hemolytic uremic syndrome

“…Pospiech et al synthesized aromatic polyesters based on 5‐hydroxy isophthalic acid with semifluorinated side chains and found that poly( p ‐phenylene isophthalate) with oxydecylperfluorodecyl side chains formed a self‐organizing liquid crystalline structure that resulted in low values of surface free energy 34,35…”

Temperature dependant structural changes in thin films of random semifluorinated PMMA copolymers

“…The internal microphase separation leads mostly to smectic layered structures in which the backbones and layers of SF side chains alternate Pospiech et al, 2003b). Former experiments examined in detail the behaviour of different polymers with H10F10 side chains [-O-(CH 2 ) 10 -(CF 2 ) 10 -F] Pospiech et al, 2003a). Combination of different scattering methods and thermal treatments yielded in understanding the special side chain structure characterized by interdigitation and tilt of side chains (Jehnichen et al, 2004;Jehnichen et al, 2007).…”