Thermo Scientific™ Polyethyleneimine (PEI), molecular weight ~60,000, supplied as a 50% (w/w) aqueous solution, is a high-molecular-weight branched polyamine widely used in nanomaterials research, surface modification, water treatment, adhesives, coatings, catalysis, and polymer functionalisation.

This grade contains a dense network of primary, secondary, and tertiary amines, providing extremely high cationic charge density. Its high molecular weight enables exceptional film-forming ability, strong adhesion to surfaces, enhanced viscosity, and high performance in crosslinking and flocculation applications.

The reagent is supplied as a clear, viscous, water-soluble polymer solution, ensuring ease of use, rapid dissolution, and safe, ambient-temperature storage.

Key Features & Benefits

High Molecular Weight (M.W. ~60,000)

• Stronger binding, thicker coatings, and higher cohesive strength than lower-MW PEIs
• Ideal for creating durable films, hydrogels, and polyelectrolyte layers
• Excellent for nanoparticle coating and surface functionalisation

50% (w/w) Aqueous Solution

• Ready-to-use, no heating required
• Reduced viscosity compared to solid high-MW PEI
• More stable and safer to handle than powdered PEI
• Easily miscible with water and many polar solvents

High Purity & Analytical Consistency

• Solids content: 48–52%
• GC purity ≥98.5%
• Infrared spectrum conforms to PEI signature
• Clear viscous liquid ensures batch integrity

Chemical & Regulatory Information

Analytical Specifications

Applications

1. Nanotechnology & Surface Engineering

• Gold, silica, iron oxide, and polymer nanoparticle coating
• Stabilisation of nanomaterials
• Layer-by-layer (LbL) assembly
• Charge-controlled surface modification

2. Polymer Science & Chemical Synthesis

• Crosslinking agent for epoxy, acrylic, and polyurethane systems
• Precursor for functionalised polymers
• Enhances resin adhesion and durability
• Component in polyelectrolyte complexes and hydrogels

3. Environmental & Industrial Processes

• Highly effective flocculant and coagulant for water and wastewater treatment
• Chelation and removal of heavy metals
• Modification of filtration membranes

4. Biotechnology & Biointerfaces

• Cell-surface coating studies
• Immobilisation of biomolecules
• Research-grade DNA/RNA binding polymer
• Preparation of biocompatible hydrogels and scaffolds

Ordering Information

Thermo Scientific™ Polyethyleneimine (PEI), M.W. ~60,000 (50% aqueous solution), is a high-performance branched polyamine ideal for nanotechnology, surface functionalisation, polymer modification, catalysis, environmental remediation, and advanced materials research. Its high molecular weight combined with a ready-to-use 50% solution format provides unmatched convenience, reactivity, and versatility across scientific and industrial applications.