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Published in: Colloid and Polymer Science 8/2013

01-08-2013 | Original Contribution

pH-responsive amphiphilic hybrid random-type copolymers of poly(acrylic acid) and poly(acrylate-POSS): synthesis by ATRP and self-assembly in aqueous solution

Authors: Zhuo Wang, Beng H. Tan, Hazrat Hussain, Chaobin He

Published in: Colloid and Polymer Science | Issue 8/2013

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Abstract

The synthesis and subsequent self-assembly of novel, random-type amphiphilic pH-responsive hybrid copolymers, having acrylic acid as pH-responsive hydrophilic and acrylate-polyhedral oligomeric silsesquioxane (POSS) as hydrophobic constituents are reported. The synthesis was carried out in two steps: first, t-butylacrylate and acrylate-POSS are copolymerized by ATRP, followed by the acid hydrolysis of t-butyl acrylate constituents of the synthesized poly(t-butylacrylate)-co-poly(acrylate-POSS) copolymers to achieve poly(acrylic acid)-co-poly(acrylate-POSS). It was found that POSS is a powerful hydrophobic unit. With very low POSS concentration in the copolymers, i.e., one POSS unit per 40 to 110 acrylic acid repeat units, the obtained amphiphilic hybrid copolymers could self-assemble in aqueous solution to form nanoaggregates, as revealed by the laser light scattering and fluorescence studies on the aqueous solutions of the obtained copolymers. The formation of hydrophobic core in the self-assembled aggregates is verified by the solubilization of pyrene (used as probe in fluorescence measurements) in aqueous solution of the copolymers. In addition to pH-dependent self-assembly behavior, it is also demonstrated that the particle size and aggregation number of the aggregates can be tuned simply by varying the composition of the copolymer, i.e., by changing the molar ratio of poly(acrylic acid) to poly(acrylate-POSS) in the copolymer. Finally, preliminary results on the influence of salt (NaCl) on the self-assembly of poly(acrylic acid)-co-poly(acrylate-POSS) in aqueous solution are also presented.

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Metadata
Title
pH-responsive amphiphilic hybrid random-type copolymers of poly(acrylic acid) and poly(acrylate-POSS): synthesis by ATRP and self-assembly in aqueous solution
Authors
Zhuo Wang
Beng H. Tan
Hazrat Hussain
Chaobin He
Publication date
01-08-2013
Publisher
Springer Berlin Heidelberg
Published in
Colloid and Polymer Science / Issue 8/2013
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-013-2914-0

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