Poly(acrylamide)
[CAS# 9003-05-8]

Identification

• Classification: Food additive >> Stabilizing and coagulating agent
• Name: Poly(acrylamide)
• Synonyms: 2-Propenamide homopolymer
• Molecular Formula: (C₃H₅NO)_n
• Molecular Weight: 5,000,000-6,000,000
• CAS Registry Number: 9003-05-8
• EC Number: 618-350-3
• SMILES: C=CC(N)=O

Properties

• Density: 0.750 g/mL
• Melting point: 246-250 ºC

Safety Data

• Safety Description: S24/25

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute toxicity	Acute Tox.	4	H302
Eye irritation	Eye Irrit.	2	H319
Eye irritation	Eye Irrit.	2B	H319

Discovory and Applicatios

Poly(acrylamide) is a synthetic polymer that is widely used in a variety of applications due to its ability to form hydrogels and its effectiveness as a flocculant. It was first synthesized in the 1950s and quickly gained attention for its versatility and practical uses. The polymer is produced by polymerizing acrylamide, a compound derived from propylene, under controlled conditions. The resulting polymer can be tailored by adjusting the degree of polymerization, allowing for the creation of materials with varying properties depending on the intended application.

One of the most common uses of poly(acrylamide) is in water treatment. The polymer acts as a flocculant, a substance that facilitates the aggregation of particles in water, making it easier to separate solid impurities from liquids. Poly(acrylamide) is particularly effective in municipal wastewater treatment and in the treatment of industrial effluents, where it helps clarify water by promoting the coagulation of suspended solids. The ability of poly(acrylamide) to improve the efficiency of water treatment processes makes it an essential material in the environmental management industry.

Poly(acrylamide) is also extensively used in the oil and gas industry, particularly in enhanced oil recovery (EOR). In this application, the polymer is added to water or brine solutions that are injected into oil reservoirs to increase the extraction of crude oil. Poly(acrylamide) improves the mobility of the oil and helps to displace trapped oil from the reservoir rock, increasing the yield from oil wells. The polymer’s ability to form high-viscosity solutions enhances its effectiveness in this application.

In the field of agriculture, poly(acrylamide) is used in soil treatment and erosion control. It is added to irrigation water to improve the retention of moisture in the soil, which is beneficial in arid and semi-arid regions. By reducing water runoff and soil erosion, poly(acrylamide) contributes to more efficient water usage in agricultural practices.

Poly(acrylamide) is also widely used in the production of paper and textiles. In the paper industry, it is employed as a retention aid to help hold the fine particles of cellulose fibers together, improving the quality and strength of paper. In textiles, poly(acrylamide) serves as a finishing agent that enhances the properties of fabrics, such as their durability and resistance to wrinkles.

In addition to these applications, poly(acrylamide) is used in various cosmetic and personal care products, where it serves as a thickening agent and film-forming agent. It is included in formulations such as shampoos, lotions, and creams to improve their texture and stability. The polymer's water-retention properties also make it useful in products aimed at moisturizing and hydrating the skin.

Although poly(acrylamide) is generally considered safe for use in many industrial and consumer products, concerns about its potential toxicity have arisen due to the presence of unpolymerized acrylamide, a neurotoxin. However, regulatory agencies have established guidelines to limit exposure to residual acrylamide, ensuring that poly(acrylamide) products are safe when used according to established standards.

The discovery and application of poly(acrylamide) demonstrate its broad utility in numerous sectors, from environmental protection and industrial processes to agriculture and personal care. Its ability to modify the properties of water, soil, and materials makes it a key substance in a wide range of applications that improve the efficiency and effectiveness of modern industry.

References

2010. Tuning hydrogel properties and function using substituent effects. Soft Matter, 6(9).
DOI: 10.1039/c001548b

2010. Protein molecularly imprinted polyacrylamide membrane: for hemoglobin sensing. Analyst, 135(10).
DOI: 10.1039/c0an00191k

2010. Acrylamide risk in food products: The shortbread case study. Analytical Methods, 2(11).
DOI: 10.1039/c0ay00191k