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Type: Journal article
Title: Dynamic light scattering of semidilute hydrophobically modified alkali-soluble emulsion solutions with different lengths of poly(ethylene oxide) spacer chain
Author: Dai, S.
Tam, K.
Jenkins, R.
Citation: Journal of Polymer Science Part B-Polymer Physics, 2005; 43(22):3288-3298
Publisher: John Wiley & Sons Inc
Issue Date: 2005
ISSN: 0887-6266
Statement of
Sheng Dai, Kam Chiu Tam and Richard D. Jenkins
Abstract: Semidilute solutions of hydrophobically modified alkali-soluble emulsion (HASE) were examined by dynamic light scattering and rheological techniques. For the model polymer without associative macromonomer, two q2 dependent diffusional modes were detected in the decay time distributions. With increasing hydrophobicity of the associative macromonomer, the narrow fast peak was substituted by a shallow broad peak and only one q2 dependent slow mode could be accurately detected, which indicated that the heterogeneity of these associated clusters increases with increasing carbon number. The bulk steady-shear viscosity exhibits similar results to the diffusion coefficients of the aggregate observed from light scattering measurements. The length of poly(ethylene oxide) (PEO) spacer chain alters the solution properties as well as the associative cluster structure. With increasing length of PEO spacer chain, intramolecular association was substituted by intermolecular association. For EO segment larger than 32 units, intramolecular association dominates, where the formation of HASE aggregates is controlled by the balance of electrostatic repulsion and hydrophobic attraction.
Keywords: Associative polymer; dynamic light scattering; PEO; rheology; semidilute
Rights: Copyright © 2005 Wiley Periodicals, Inc.
RMID: 0020112538
DOI: 10.1002/polb.20588
Appears in Collections:Chemical Engineering publications

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