Aggregative Behavior of Poly(ethylene oxide) in Water and Methanol

Abstract

Static and dynamic light scattering were measured for monodisperse polyethylene oxide) (PEO) in water and methanol at 25 °C. PEOs of three different molecular weights ranging from nominal Afw = 2.6 X 104 to 9.96 X 10s were used. For all of these molecular weights, angular dependence of Zimm plots showed no downturn at low angles not only in water but also in methanol, indicating no large aggregates of PEO in both solvents. Furthermore, apparent weight-average molecular weight " , radius of gyration Rgapp-and hydrodynamic radius Rhm did not change over 3 weeks. This observation indicates that molecularly dispersed PEO is stable and aggregate-free property is inherent in these solvents.

Polymer-mediated chain-like self-assembly of functionalized gold nanoparticles

“…2c and 2e). The origin of these aggregates can be traced to the well-known phenomenon of PEO association in aqueous solution [41,42]. The PEO molecules used in this work were terminated by -OH group, which may have favored the clustering of PEO as mentioned in literature [41,42].…”

Phase behaviour of colloids with short-range repulsions plus nonadsorbing polymer chains

“…[19][20][21][22][23][24] like the colloid concentration, c, expressed in g L À1 to reduced quantities like the colloid volume fraction, f, typically used in theoretical descriptions. To this end, we measure scattering intensities of a colloid/salt concentration series with SAXS, as shown in Fig.…”

Mild Synthesis of Amino‐Poly(ethylene glycol)s. Application to Steric Stabilization of Clays

“…The failure of these titrations could be attributed to the presence of aggregates in aqueous solution, which enclose some amino groups. PEG aggregation in aqueous solution is a well known phenomenon20 and evidences of polymer aggregation were already described for amino‐PEGs 8…”