Characterization of complexation and phase behavior of mixed systems of unmodified and hydrophobically modified oppositely charged polyelectrolytes

Beheshti, Neda; Zhu, Kaizheng; Kjøniksen, Anna–Lena; Nyström, Bo

doi:10.1007/s00396-010-2239-1

Cited by 12 publications

(9 citation statements)

References 28 publications

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“…23 Another complication of the situation appears if one considers hydrophobically modied polyelectrolytes, which renders the surfactant-polyelectrolyte interactions even more complex. 24 In the following we will focus on mixtures of surfactants with biopolyelectrolytes, but for a better comparison will start with a brief overview of results on conventional synthetic polyelectrolytes. Subsequently we will concentrate on ionically modied cellulose and chitosan as two rather important biopolyelectrolytes.…”

Section: Introductionmentioning

confidence: 99%

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

2013

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We review the work done on complexes between biopolyelectrolytes such as ionically modified cellulose or chitosan and oppositely charged surfactants. Around equimolarity of the charges one typically observes precipitation but for other mixing ratios one may form long-time stable complexes, where structure and rheology depend on the mixing ratio, total concentration and the molecular constitution of the components. In addition, it may be the case that the structures are formed under non-equilibrium situations and therefore depend on the preparation path. The binding is shown to occur cooperatively and the micelles present often retain their shape irrespective of the complexation. However, the rather stiff biopolyelectrolytes may lead to an interconnection between different aggregates thereby forming a network with the corresponding rheological properties. In general, the structure and the properties of the aggregates are rather versatile and correspondingly one can create a wide range of different surfactant-biopolyelectrolyte systems by appropriately choosing the composition. This is very interesting as it allows for formulations with a large range of tuneable properties with ecologically friendly polyelectrolytes for many relevant applications.

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Section: Introductionmentioning

confidence: 99%

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

2013

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“…A-0382) acquired from Hercules, Aqualon Division, was used as the hydrophilic polymer and served as the precursor for the synthesis of the copolymers (MHEC- g -PNIPAAM and MHEC(−)- g -PNIPAAM) with grafted PNIPAAM. The degree of substitution of hydroxyethyl groups per repeating anhydroglucose unit for this HEC sample is 2.5 (given by the manufacturer), and the number-average and weight-average molecular masses were determined to be M n = 57 000 g/mol and M w = 400 000 g/mol, respectively, by asymmetric flow field-flow fractionation [ 27 ]. The polymer was first desiccated to remove absorbed moisture and then dried under vacuum.…”

Section: Methodsmentioning

confidence: 99%

Temperature-responsive self-assembly of charged and uncharged hydroxyethylcellulose-graft-poly(N-isopropylacrylamide) copolymer in aqueous solution

et al. 2011

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Temperature-induced interchain association and contraction of species in aqueous solutions of charged (MHEC(−)-g-PNIPAAM) and uncharged (MHEC-g-PNIPAAM) modified hydroxyethylcellulose-graft-poly(N-isopropylacrylamide) copolymer have been studied with the aid of turbidimetry and dynamic light scattering (DLS). It was shown that by attaching PNIPAAM chains to the backbone of a hydrophilic cellulose derivative, a strongly temperature-responsive copolymer could be prepared. The results show an intriguing interplay between interchain association and contraction of the multichain species. The transition zone for compression is narrow, and the compaction effect is promoted by a low polymer concentration and charges on the polymer moieties. The findings from DLS revealed two populations of species, namely molecularly dispersed molecules or small clusters and interchain complexes, which exhibit temperature-induced collapse. The magnitude of the cluster contraction can be modulated by changing the polymer concentration and charge density of the copolymer.

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“…In SALS, a laser beam is applied to the sample, 2D scattering patterns are acquired and the angular distribution (and intensity) of the scattered light is measured 164 . Specific orientations and deformations of a material can for instance be identified by a stretched scattering pattern 164 , while the occurrence of aggregates can result in an augmented intensity and/or radius of the 2D pattern 165 .…”

Section: Rheology Principles and Rheo-salsmentioning

confidence: 99%

Interactions between ethyl(hydroxyethyl) cellulose and lysine-based surfactants in aqueous media

Calejo

Kjøniksen

Marques

et al. 2012

European Polymer Journal

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for all the guidance throughout this journey. I cannot thank you enough for all your unlimited support and encouragement, and for all the productive discussions. Thank you so much for believing in me and for making me feel so appreciated. I am deeply grateful to Professor Amália Jurado and Professor Maria da Conceição Lima, who accepted my stay in the laboratories of the Center for Neuroscience and Cell Biology, University of Coimbra. The time I spent in Coimbra was both extremely intense and fruitful, and I feel profoundly privileged for having enjoyed this experience. Thank you for your kindness and support. I would like to express my deep gratitude to Ana Maria Cardoso for her support in the laboratories in Coimbra, for her unlimited patience and encouragement. Thank you for always being there for me. You are a wonderful friend.

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Characterization of complexation and phase behavior of mixed systems of unmodified and hydrophobically modified oppositely charged polyelectrolytes

Cited by 12 publications

References 28 publications

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

Temperature-responsive self-assembly of charged and uncharged hydroxyethylcellulose-graft-poly(N-isopropylacrylamide) copolymer in aqueous solution

Interactions between ethyl(hydroxyethyl) cellulose and lysine-based surfactants in aqueous media

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