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RESEARCH PRODUCT

Characterization of Micelles of Polyisobutylene-block-poly(methacrylic acid) in Aqueous Medium

Jürgen KlinglerJesper FeldthusenMatthias GerstPeter RossmanithAxel H. E. MüllerHorst SchuchThomas Frechen

subject

chemistry.chemical_classificationPoly(methacrylic acid)Aqueous solutionPolymers and PlasticsOrganic ChemistryAnalytical chemistryFluorescence correlation spectroscopyPolymerMicelleInorganic Chemistrychemistry.chemical_compoundchemistryMethacrylic acidDynamic light scatteringPolymer chemistryMaterials ChemistryCopolymer

description

Four amphiphilic block copolymers polyisobutylene-block-poly(methacrylic acid) (IBm-MAAn; m = 70−134, n = 52−228) were synthesized and transferred into aqueous medium at pH 10−12. Their structure in solution was characterized by fluorescence correlation spectroscopy (FCS), static and dynamic light scattering (SLS, DLS), analytical ultracentrifuge (AUC), and by transmission electron microscopy (TEM) with freeze-fracturing and staining techniques. DLS data, AUC sedimentation traces, and TEM images indicate at least two different kinds of particles. TEM shows spherical micelles; however, especially for polymers with larger hydrophobic blocks, additional particles are observed. FCS shows extremely low critical micelle concentrations (cmc < 0.3 mg/L). The main part of the particles consists of micelles with diameters from 15 to 50 nm, built by 130−200 block copolymer molecules. Aggregation numbers and diameters are consistent with a model recently proposed by Forster et al. (J. Chem. Phys. 1996, 104, 9956−9970...

yearjournalcountryeditionlanguage
2000-02-12Macromolecules
https://doi.org/10.1021/ma991491e