Sodium poly(aspartate)
Sodium poly(aspartate) is a condensation polymer based on aspartic acid. The polymerization reaction is an example of a step-growth polymerization to a polyamide and in one practical procedure[1] aspartic acid is simply heated to 180 °C resulting in water release and the formation of a poly(succinimide) with succinimide repeating units. In the subsequent step this polymer is reacted with sodium hydroxide in water which results in partial cleavage of the amide bonds. Two different bonds (α and β) are hydrolyzed resulting in a sodium poly(aspartate) copolymer with 30% α-linkages and 70% β-linkages.
Sodium poly(aspartate) is used as an anti-scaling agent.[2] This material can synthesized in an environmentally friendly way and is biodegradeable, thus it is a green alternative to materials such as sodium polyacrylate.[3]
It is a chelating agent.
References
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- ↑ Bennett GD (2005). "A Green Polymerization of Aspartic Acid for the Undergraduate Organic Laboratory" (Abstract). J. Chem. Educ. 82: 1380–1381. doi:10.1021/ed082p1380.
- ↑ Low KC, Wheeler AP, Koskan LP (1996). Commercial poly(aspartic acid) and Its Uses. Advances in Chemistry Series. 248. Washington, D.C.: American Chemical Society.
- ↑ "Presidential Green Chemistry Challenge Awards: 1996 Small Business Award: Donlar Corporation (now NanoChem Solutions, Inc.): Production and Use of Thermal Polyaspartic Acid". US Environmental Protection Agency.
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