Structure, rheology, and microrheology of wormlike micelles made of PB-PEO diblock copolymers

Soft Matter
Antonio Tavera-VázquezRolando Castillo

Abstract

A diblock copolymer made of poly(1,4-butadiene)-block-polyethylene oxide, with a degree of polymerization of the polybutadiene and polyethylene oxide blocks of 37 and 57, respectively, self-assembles in water as worm-like micelles determined by small angle neutron scattering with an average diameter of ∼12.7 nm, a core radius of ∼2.7 nm, a shell radius of ∼3 nm, and an estimated persistence length of >225 nm. Worm-like micelles of almost the same diblock copolymer, but with a smaller polyethylene oxide block (degree of polymerization 45) were also measured. The worm-like micelles were also observed with negative staining using low energy electron microscopy. The boundary between dilute and semidilute regimes was estimated to be ∼0.8 wt%. The viscoelastic spectra at low and intermediate frequencies do not follow the Maxwell model. These micelles do not present the same rheological behavior of worm-like micelle solutions of conventional surfactants. The slow dynamics of the self-assembly explains this uncommon behavior for the system. Any micellar rearrangement is impeded due to the extremely high hydrophobicity of the polybutadiene block; stress mainly relaxes by the reptation mechanism. Using diffusive wave spectroscopy, we mea...Continue Reading

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Citations

Oct 2, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Antonio Tavera-VázquezRolando Castillo

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Methods Mentioned

BETA
X-ray
rheology
small angle neutron scattering
SANS
neutron scattering

Software Mentioned

Igor Pro SANS

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