Polyacrylic acid

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Poly(acrylic acid)
Polyacrylic acid.png
Identifiers
CAS number 9003-01-4 YesY
KEGG C19501 N
Properties
Molecular formula (C3H4O2)n
Molar mass variable
Hazards
EU classification Irritant Xi
R-phrases R36 R37 R38
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g., sodium chloride Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references
For a description of unrelated compounds expanded by two-carbon units, see carbo-mer.

Poly(acrylic acid) (PAA or Carbomer) is generic name for synthetic high molecular weight polymers of acrylic acid. They may be homopolymers of acrylic acid, crosslinked with an allyl ether pentaerythritol, allyl ether of sucrose or allyl ether of propylene. In a water solution at neutral pH, PAA is an anionic polymer, i.e. many of the side chains of PAA will lose their protons and acquire a negative charge. This makes PAAs polyelectrolytes, with the ability to absorb and retain water and swell to many times their original volume. Dry PAAs are found in the market as white and fluffy powders. Carbomer codes (910, 934, 940, 941 and 934P) are an indication of molecular weight and the specific components of the polymer. For many applications PAAs are used in form of alkali metal or amonium salts e.g. sodium polyacrylate.

Applications[edit]

Poly acrylic acid and its derivatives are used in disposable diapers,[1] ion exchange resins and adhesives. They are also popular as a thickening, dispersing, suspending and emulsifying agents in pharmaceuticals, cosmetics and paints.[2] PAA inactivates the antiseptic chlorhexidine gluconate.[citation needed]

See also[edit]

References[edit]

  1. ^ http://pslc.ws/macrog/acrylate.htm
  2. ^ Orwoll, Robert A.; Yong, Chong S. (1999). "Poly(acrylic acid)". In Mark, James E. Polymer Data Handbook. Oxford University Press, Inc. pp. 252–253. ISBN 978-0195107890.