Tailoring of polymer properties by the synthesis of multiblock copolymers

Abstract

Abstract-The coupling of liquid crystalline segments with both flexible segments [e.g. poly(tetrahydrofuran)] and rigid-amorphous segments (e.g. polysulfone) enables the tailoring of desired properties such as phase and thermal behavior, solid phase structure and, in particular, morphology. Multiblock copolymer formation allows the generation of different morphological features, ranging from non-to strongly phase separated systems. The macroscopical properties (dynamic-mechanical and rheological behavior, mechanical properties) reflect the combination of two polymers and can be balanced by using suitable molecular weights of the coupled segments.

Recent advances in the preparation of functionalized polysulfones

“…For instance, hydroxy‐terminated polysulfones were prepared by polycondensation of 4,4'‐dichlorodiphenyl sulfone with an excess of bisphenol‐A . These telechelics can be used in curing of commercial bisepoxides to yield epoxy networks or building blocks of multiblock poly(ether‐esters) . The polyester blocks consisting of poly(ethylene terephthalate) or liquid crystalline poly(ester‐imide)s showed interesting mechanical properties in the polysulfone matrix.…”

Synthesis and characterization of polysulfone-g-poly(2-alkyl-2-oxazoline)s

“…There is a variety of modification techniques for imparting amphiphilic character to PSUs. Many reports for the modification have been based on the reactive functionalization [13][14][15][16][17][18][19] followed by polymerization through these functional groups. Typically, sulfonation or halogenation reactions were used to introduce initiating or reactive sites for blocking and grafting of hydrophilic monomers or oligomers, respectively [20][21][22][23].…”

Synthesis and Phase Separation Behaviour of High Performance Multiblock Copolymers

“…An influence of phase separation on the G -modulus cannot be detected in this block copolymer system, but it has been found in other multiblock copolymers, in which non-phaseseparated multiblock copolymers showed the highest moduli [25,26]. Table 6 summarizes the results obtained for the multiblock copolymer systems with different chemical structure of the semiflexible/nematic segments.…”

“…The multiblock copolymer synthesis was carried out as previously reported for the PSUpoly(tetramethylene oxide) (PSU-PTMO) multiblock copolymer [22], the PSU-poly(ethylene terephthalate-co-oxybenzoate) (PSU-PET/HBA) multiblock copolymer [23,24], the PSUpoly(ethylene terephthalate-co-polyester imide) (PSU-PET/PEI) multiblock copolymer [25,26], the PSU-poly(ester imide) multiblock copolymer having phenylene or t-butyl substituents at the trimellitimide ring (PSU-PEI(t-but)) [27] and is described in the following for a PSU semifluorinated polyester (PSU-SF-PES) multiblock copolymer.…”