The binary phase behavior of short-chain PDMS-b-PEO diblock copolymers in aqueous solutions in dependence of the PDMS chain length—a combined polarized optical microscopy, 2H NMR and SAXS study
作者： Guido Kickelbick , Josef Bauer , Nicola Hüsing , Martin Andersson , Krister Holmberg
DOI: 10.1016/J.COLSURFA.2004.11.011
关键词: Polymer chemistry 、 Deuterium NMR 、 Analytical chemistry 、 Lamellar structure 、 Aqueous solution 、 Phase (matter) 、 Materials science 、 Copolymer 、 Small-angle X-ray scattering 、 Pulmonary surfactant 、 Lamellar phase
摘要: Abstract The binary phase behavior of three short-chain polydimethylsiloxane-b-poly(ethylene oxide) (PDMS-b-PEO) diblock copolymers with the compositions DMS4-b-EO12, DMS6-b-EO12 and DMS10-b-EO12 (DMS = dimethylsiloxane unit, EO = ethylene oxide unit) was investigated in aqueous solutions using polarizing light microscopy, deuterium NMR spectroscopy, SAXS measurements. At low surfactant concentrations all show a mixed water/lamellar (W + Lα), which switches to lamellar depending on DMS length temperature region 40 wt.% for DMS4 over 50 wt.% DMS10. surfactants consisting DMS6 further concentration range between 40 85 wt.% predominately phases. While at very high rich L2 developed. If segment increased 10 units 55 wt.% approximately 75% dominated by “inverse hexagonal” higher pure afterwards developed, respectively.
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