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Synthesis, characterization and behavior in aqueous solution of star-shaped Poly(acrylic acid)

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2005

Autor:innen

Plamper, Felix A.
Becker, Harald
Lanzendörfer, Michael
Patel, Mushtaq
Ballauff, Matthias
Müller, Axel H. E.

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http://nbn-resolving.de/urn:nbn:de:bsz:352-202100
DOI (zitierfähiger Link)
https://doi.org/10.1002/macp.200500238
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Macromolecular Chemistry and Physics. 2005, 206(18), pp. 1813-1825. ISSN 1022-1352. Available under: doi: 10.1002/macp.200500238

Zusammenfassung

We report the synthesis of star-shaped poly(acrylic acid) (PAA), with 5, 8, and 21 arms, by atom transfer radical polymerization of tert-butyl acrylate. We employ the core-first approach using glucose-, saccharose- and cyclodextrin-based initiators. Subsequent acidic treatment of poly(tert-butyl acrylate) (PtBA) leads to star-shaped poly(acrylic acid) (PAA). Alkaline cleavage of the arms enabled us to determine the initiation site efficiency. The PAA stars and arms were esterified to poly(methyl acrylate) (PMA). Molecular weight determination by means of GPC/viscosity, MALDI-TOF MS and NMR end-group determination showed that the initiation site efficiency is close to unity. Results from potentiometric titration of PAA arms and stars show that the apparent pKa values increase with increasing arm number, which is a direct result of increasing segment density. Osmometry measurements of aqueous solutions of the PAA stars result in osmotic coefficients between 0.05 and 0.38, indicating that most of the counterions are confined within the star. The confinement increases with arm number.

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Fachgebiet (DDC)
540 Chemie

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atom transfer radical polymerization (ATRP), osmotic coefficient, polyelectrolytes, polymer synthesis, potentiometric titration, star polymers

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ISO 690PLAMPER, Felix A., Harald BECKER, Michael LANZENDÖRFER, Mushtaq PATEL, Alexander WITTEMANN, Matthias BALLAUFF, Axel H. E. MÜLLER, 2005. Synthesis, characterization and behavior in aqueous solution of star-shaped Poly(acrylic acid). In: Macromolecular Chemistry and Physics. 2005, 206(18), pp. 1813-1825. ISSN 1022-1352. Available under: doi: 10.1002/macp.200500238
BibTex
@article{Plamper2005Synth-20210,
  year={2005},
  doi={10.1002/macp.200500238},
  title={Synthesis, characterization and behavior in aqueous solution of star-shaped Poly(acrylic acid)},
  number={18},
  volume={206},
  issn={1022-1352},
  journal={Macromolecular Chemistry and Physics},
  pages={1813--1825},
  author={Plamper, Felix A. and Becker, Harald and Lanzendörfer, Michael and Patel, Mushtaq and Wittemann, Alexander and Ballauff, Matthias and Müller, Axel H. E.}
}
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