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Colloid and Polymer Science
Published in: Colloid and Polymer Science 10/2015

01-10-2015 | Original Contribution

Zwitterionic polymer-grafted microspheres prepared by RAFT polymerization

Authors: Hiromi Kitano, Ken-ichi Tokuwa, Haruka Ueno, Lifu Li, Yoshiyuki Saruwatari

Published in: Colloid and Polymer Science | Issue 10/2015

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Abstract

Using a macro-RAFT agent composed of zwitterionic poly(carboxymethyl betaine) (PCMB), butyl acrylate was polymerized in emulsion polymerization system to give microspheres (PCMB-MS). Microspheres having cationic or anionic graft chains were also prepared using the similar procedures. The dispersion of PCMB-MS was very stable, and the addition of neither sodium chloride nor proteins affected colloidal properties of the MS at all. In contrast, significant salt- and protein-induced aggregations of the lopsidedly charged microspheres were observed. Upon deionization, furthermore, the dispersion of anionic poly(methacrylic acid)-grafted-MS (PMA-MS) showed clear iridescence, and its peak reflectivity was more than 90 % due to the formation of colloid crystal driven by both the electrostatic and steric repulsions between the MSs. The dispersion of PCMB-MS also showed iridescence, though its reflectivity (< 60 %) was smaller than that of PMA-MS probably because of the smaller electrostatic repulsion between PCMB-MSs than that between PMA-MSs.
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Appendix
Available only for authorised users
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Metadata
Title
Zwitterionic polymer-grafted microspheres prepared by RAFT polymerization
Authors
Hiromi Kitano
Ken-ichi Tokuwa
Haruka Ueno
Lifu Li
Yoshiyuki Saruwatari
Publication date
01-10-2015
Publisher
Springer Berlin Heidelberg
Published in
Colloid and Polymer Science / Issue 10/2015
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-015-3695-4

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