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Published in:
Swelling of a Sponge Lipid Phase via Incorporation of a Nonionic Amphiphile: SANS and SAXS Studies Read chapter Read first chapter

2011 | OriginalPaper | Chapter

pH Induced Desaggregation Of Highly Hydrophilic Amphiphilic Diblock Copolymers

Authors : Elise Lejeune, Christophe Chassenieux, Olivier Colombani

Published in: Trends in Colloid and Interface Science XXIV

Publisher: Springer Berlin Heidelberg

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Abstract

P(nBA20%-stat-AA80%)100-b-PAA95, an amphiphilic diblock copolymer consisting of a pure hydrophilic poly(acrylic acid) (PAA) block and a weakly hydrophobic statistical copolymer of n-butyl acrylate (nBA) and acrylic acid (AA) was prepared by ATRP. Kinetic studies revealed that the polymerization was well controlled, leading to a perfectly defined diblock copolymer both in terms of chemical composition and block lengths. This polymer was characterized in aqueous solution by means of light and neutron scattering experiments. In spite of its weak hydrophobic nature, P(nBA20%-stat-AA80%)100-b-PAA95 self-assembles in aqueous solution provided the ionization degree of the AA units is kept as low as α = 0-10%. Moreover, the relatively large aggregates (Nagg = 100, Rh = 18nm) formed at α = 0% molecularly dissolve at α > 20%. This pH sensitivity is in strong contrast with the behavior of the more hydrophobic PnBA90-b-PAA100 which forms frozen aggregates insensitive to external stimuli in aqueous solution.

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previous chapter Swelling of a Sponge Lipid Phase via Incorporation of a Nonionic Amphiphile: SANS and SAXS Studies
next chapter The Interaction Parameter in Binary Surfactant Mixtures of a Chelating Surfactant and a Foaming Agent
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Metadata
Title
pH Induced Desaggregation Of Highly Hydrophilic Amphiphilic Diblock Copolymers
Authors
Elise Lejeune
Christophe Chassenieux
Olivier Colombani
Copyright Year
2011
Publisher
Springer Berlin Heidelberg
Book
Trends in Colloid and Interface Science XXIV

Print ISBN: 978-3-642-19037-7

Electronic ISBN: 978-3-642-19038-4

Copyright Year: 2011

DOI
https://doi.org/10.1007/978-3-642-19038-4_2

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