Water distributions in polystyrene-block-poly[styrene-g-poly(ethylene oxide)] block grafted copolymer system in aqueous solutions revealed by contrast variation small angle neutron scattering study.
作者： Xin Li , Kunlun Hong , Yun Liu , Chwen-Yang Shew , Emily Liu
DOI: 10.1063/1.3493331
关键词: Polystyrene 、 Micelle 、 Scattering 、 Copolymer 、 Polymer chemistry 、 Aqueous solution 、 Ethylene oxide 、 Small-angle neutron scattering 、 Analytical chemistry 、 Styrene 、 Materials science
摘要: We develop an experimental approach to analyze the water distribution around a core-shell micelle formed by polystyrene-block-poly[styrene-g-poly(ethylene oxide (PEO)] block copolymers in aqueous media at fixed polymeric concentration of 10 mg/ml through contrast variation small angle neutron scattering (SANS) study. Through varying D2O/H2O ratio, contributions from molecules and micellar constituent components can be determined. Based on commonly used model, theoretical coherent cross section incorporating effect penetration is developed SANS I(Q). have successfully quantified intramicellar found that overall hydration level increases with increase molecular weight hydrophilic PEO side chains. Our work presents practical means for evaluating intramacromolecular solvent distributions general soft matter systems.
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