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Poly(acrylic acid) (PAA)

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Encyclopedia of Polymeric Nanomaterials

Synonyms

Poly(2-propenoic acid)

Definition

Poly(acrylic acid) (PAA) is a polymer of acrylic acid, which has a carboxylic group on each monomer unit. This polymer becomes a polyelectrolyte in water via dissociation of the acid groups.

Chemical Structure and Synthesis

Poly(acrylic acid) (PAA) has a carboxyl group on every two carbon atoms of the main chain. It has high negative charge density when all carboxyl groups dissociate. This polymer and poly(sodium acrylate) (NaPAA) are thus one of the most abundantly used water-soluble anionic polyelectrolytes, e.g., dispersing agent, superabsorbent polymer, ion-exchange resin, etc. Furthermore, due to low toxicity, they are used as a food additive. They are synthesized industrially by radical polymerization of acrylic acid or sodium acrylic acid as shown in Fig. 1. Therefore, the molar mass distribution of the resultant polymer is broad.

Fig. 1
figure 1

Chemical structures of poly(acrylic acid) (PAA) and poly(sodium acrylate) (NaPAA)

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References

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Authors and Affiliations

  1. Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, 560-0043, Toyonaka, Osaka, Japan

    Ken Terao

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  1. Ken Terao
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Correspondence to Ken Terao .

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Editors and Affiliations

  1. Kyoto Institute of Technology R & D Center for Bio-Based Materials, Kyoto, Japan

    Shiro Kobayashi

  2. Max-Planck-Institut für Polymerforschung, Mainz, Germany

    Klaus Müllen

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Terao, K. (2014). Poly(acrylic acid) (PAA). In: Kobayashi, S., Müllen, K. (eds) Encyclopedia of Polymeric Nanomaterials. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36199-9_279-1

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  • DOI: https://doi.org/10.1007/978-3-642-36199-9_279-1

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