Polyglycidol-Based Analogues of Pluronic Block Copolymers. Light Scattering and Cryogenic Transmission Electron Microscopy Studies
2007 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 111, no 35, 13185-13191 p.Article in journal (Refereed) Published
In this paper we parametrize nanostructures formed in water by a series of macromol. surfactants based on polyglycidol (PG). They are considered analogs of Pluronic, that is poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers, in which the blocks of PEO are substituted by PG. PG is structurally similar to PEO and differs in that each monomer unit bears a hydroxyl group. The investigated PG-PPO-PG copolymers are of a const. d.p. of the middle PPO block of 34; they cover a mol. wt. range from 2900 to 12400 and PG content from 30 to 84 wt %. The major techniques used to examine the behavior at the dil. (but invariably above the crit. aggregation concn.) concn. limit were static and dynamic light scattering; the aggregates were visualized by cryogenic transmission electron microscopy. The wt.-av. mol. wts., radii of gyration, second virial coeffs., diffusion coeffs., and hydrodynamic radii were detd. at different temps. The light scattering results revealed that the particles were considerably larger in size and aggregation no. than the micelles of the Pluronic copolymers. Hydrophobic interactions and interactions via hydrogen bonding are equally involved in formation of well-sepd. spherical particles with discontinuous hydrophobic PPO domains randomly distributed in a strongly hydrogen-bonded continuous medium consisting of PG and water.
Place, publisher, year, edition, pages
2007. Vol. 111, no 35, 13185-13191 p.
IdentifiersURN: urn:nbn:se:uu:diva-11293DOI: 10.1021/jp0724370ISI: 000249169900043OAI: oai:DiVA.org:uu-11293DiVA: diva2:39061