Polyaspartic acid is a polymer of amino acids. It is naturally present in the shells of mollusks and snails. The amino and carboxyl groups in the aspartic acid molecule condense to form amide bonds, forming the main chain of the macromolecule, with the other carboxyl group distributed on both sides of the main chain. Polyaspartic acid macromolecules contain abundant active groups such as amide bonds and carboxyl groups. The chemical stability of amide bonds is high, and they are not easily decomposed at high temperatures.

On the other hand, amide bonds are also peptide bonds, which have biological activity. Carboxyl groups ionize in water to form carboxyl negative ions, which can undergo complex reactions with various ions, giving polyaspartic acid high chemical activity in aqueous solutions. In each structural unit of polyaspartic acid, there are 4 oxygen atoms and 1 nitrogen atom, which are easily hydrogen bonded with water molecules, making it highly hydrophilic and water-soluble.

(1) Dispersibility. Low molecular weight polyaspartic acid has excellent dispersibility and can disperse various particulate matter in aqueous solutions. Such as CaCO3、CaSO4、BaSO4、Fe2O3、clay、Ca3（PO4）2 and so on.

(2) Inhibition. Low molecular weight polyaspartic acid has the ability  to prevent corrosion of carbon steel, copper, etc. It is a good corrosion inhibitor, especially suitable for preventing corrosion caused by carbon dioxide in oil production pipelines.

(3) Water absorption. Water absorbing polyaspartic acid is easily deliquescent ,  has strong water absorption and easily save water. High molecular weight polyaspartic acid can be used as an absorbent resin.

• （4）Biodegrade ability. The protein like structure of polyaspartic acid determines its good biodegrade ability. According to the standard of OECD301B, studying the biodegradability of polyaspartic acid. And the result prove, the degradation rate of polyaspartic acid exceeds 18.8% within 10 days, and the biodegradation rate reaches 73% within 28 days. It is a easily biodegradable substance.

• （5）Environmental Friendly. Polyaspartic acid is non-toxic and harmful to the environment and its environmental microorganisms. The small molecule product of its decomposition, aspartic acid, is a biological nutrient that can be directly absorbed by environmental microorganisms.

Therefore, polyaspartic acid is a multifunctional, environmentally friendly, water-soluble polymer material.