Overview
Polyacrylamide gel (PAG) is a crosslinked polymer derived from acrylamide monomers. It is synthesized via free-radical polymerization and is prized for its tunable pore size and mechanical stability. The gel’s properties can be customized by adjusting monomer concentration and crosslinker ratios, making it versatile for scientific and industrial uses. Initially developed for electrophoresis in the 1950s, PAG has since expanded into environmental and petroleum industries due to its water-absorbing capacity and rheological control. Its non-reactive nature (post-polymerization) ensures compatibility with biomolecules and harsh chemical environments.
Physical and Chemical Properties
PAG exhibits unique viscoelasticity and can absorb hundreds of times its weight in water, forming a hydrogel. Its porosity is determined by the bisacrylamide crosslinker ratio—higher crosslinking yields smaller pores, ideal for separating small molecules like peptides. The gel is chemically inert but degrades under UV light or extreme pH. Its thermal stability allows use up to 100°C, though prolonged heating causes hydrolysis. Electrical neutrality in standard forms makes it suitable for SDS-PAGE, while modified ionic variants (e.g., cationic PAG) bind charged particles in water treatment.
Main Applications
In biotechnology, PAG is the standard medium for protein and nucleic acid separation via gel electrophoresis. Its uniform pore size enables precise molecular weight determination. Industrial applications dominate in water treatment, where cationic PAG flocculates suspended solids, reducing sludge volume by up to 90%. The petroleum industry employs PAG for enhanced oil recovery (EOR), injecting it into wells to displace trapped oil. Its shear-thinning behavior improves sweep efficiency. Lesser uses include cosmetics (thickener) and agriculture (soil conditioner to retain moisture).
Safety and Storage
Handling requires caution due to residual acrylamide monomers (a neurotoxin). Always use gloves and masks when processing dry powder. Polymerized gel is non-hazardous but should be disposed of as chemical waste to prevent environmental release. Store PAG in sealed containers away from humidity, which triggers premature crosslinking. Refrigeration extends shelf life but avoid freezing, which alters pore structure. Label containers with batch-specific molecular weight and crosslinking data for traceability.
B2B Procurement Guide
When sourcing PAG, prioritize suppliers providing certificates of analysis (CoA) for monomer content (<0.05% is ideal). Specify parameters like molecular weight (e.g., 10–20 million Da for EOR) and ionic type—anionic for mineral processing, cationic for wastewater. Bulk buyers should negotiate prices for ≥1-ton orders, though shipping costs rise due to PAG’s high water content in gel form. Consider regional manufacturers (e.g., China for cost efficiency, EU/US for stringent QC) and audit their polymerization facilities to ensure consistent crosslinking control.
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