%0 Journal Article %1 doi:10.1021/la051463r %A Frank, Christian %A Sottmann, Thomas %A Stubenrauch, Cosima %A Allgaier, Jürgen %A Strey, Reinhard %D 2005 %J Langmuir %K Sottmann from:mkrappel %N 20 %P 9058-9067 %R 10.1021/la051463r %T Influence of Amphiphilic Block Copolymers on Lyotropic Liquid Crystals in Water−Oil−Surfactant Systems %U https://doi.org/10.1021/la051463r %V 21 %X In ternary water−oil−nonionic alkyl polyglycol ether (CiEj) microemulsions, an increase in efficiency is always accompanied by the formation of a lamellar (Lα) phase. The addition of an amphiphilic block copolymer to the ternary base system increases the efficiency of the microemulsion drastically while suppressingat least partlythe formation of the Lα phase. However, amphiphilic block copolymers can be used not only to suppress the formation of lyotropic liquid crystals but also for the opposite effect, namely, to induce their formation. To understand to what extent the increase in efficiency is accompanied by the formation of lyotropic liquid crystals, we studied phase diagrams of water−n-alkane−n-alkyl polyglycol ethers (CiEj)−PEPX−PEOY at a constant volume fraction of oil in the water/oil mixture. Using polymers of the poly(ethylene propylene)−copoly(ethylene oxide) type, with MPEP = X kg mol-1 and MPEO = Y kg mol-1, we determined phase diagrams as a function of the polymer concentration, size, and symmetry. Moreover, the influence of a particular polymer mixture was studied, which turned out to be the best system if both a high efficiency and a low tendency to form an Lα phase are needed.

@article{doi:10.1021/la051463r, abstract = { In ternary water−oil−nonionic alkyl polyglycol ether (CiEj) microemulsions, an increase in efficiency is always accompanied by the formation of a lamellar (Lα) phase. The addition of an amphiphilic block copolymer to the ternary base system increases the efficiency of the microemulsion drastically while suppressingat least partlythe formation of the Lα phase. However, amphiphilic block copolymers can be used not only to suppress the formation of lyotropic liquid crystals but also for the opposite effect, namely, to induce their formation. To understand to what extent the increase in efficiency is accompanied by the formation of lyotropic liquid crystals, we studied phase diagrams of water−n-alkane−n-alkyl polyglycol ethers (CiEj)−PEPX−PEOY at a constant volume fraction of oil in the water/oil mixture. Using polymers of the poly(ethylene propylene)−copoly(ethylene oxide) type, with MPEP = X kg mol-1 and MPEO = Y kg mol-1, we determined phase diagrams as a function of the polymer concentration, size, and symmetry. Moreover, the influence of a particular polymer mixture was studied, which turned out to be the best system if both a high efficiency and a low tendency to form an Lα phase are needed. }, added-at = {2020-08-03T08:28:46.000+0200}, author = {Frank, Christian and Sottmann, Thomas and Stubenrauch, Cosima and Allgaier, Jürgen and Strey, Reinhard}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/29733bbcf1ca13257cb6f93d52845d3b7/ak_sottmann}, doi = {10.1021/la051463r}, eprint = {https://doi.org/10.1021/la051463r}, interhash = {579310fce0d281574b1977f74365d156}, intrahash = {9733bbcf1ca13257cb6f93d52845d3b7}, journal = {Langmuir}, keywords = {Sottmann from:mkrappel}, note = {PMID: 16171333}, number = 20, pages = {9058-9067}, timestamp = {2020-08-03T06:28:46.000+0200}, title = {Influence of Amphiphilic Block Copolymers on Lyotropic Liquid Crystals in Water−Oil−Surfactant Systems}, url = {https://doi.org/10.1021/la051463r }, volume = 21, year = 2005 }