Thermo Scientific™ Polyethyleneimine (PEI), M.W. 1,200 ≥99%, branched, is a high-purity, multifunctional polyamine polymer widely utilised in chemical synthesis, DNA/RNA transfection, nanoparticle surface modification, resin functionalisation, wastewater treatment, and advanced materials research.

This low-molecular-weight branched PEI features a dense distribution of primary, secondary, and tertiary amine groups, giving it exceptional cationic charge density, strong chelation properties, and high reactivity toward a wide range of substrates.

Supplied as a pale yellow liquid, the reagent is easy to handle, miscible with water, and stable at ambient storage temperatures.

Key Features & Benefits

High-Purity Branched PEI (≥99%)

• Reliable batch-to-batch consistency for research and industrial use
• High amine functionality for efficient crosslinking, chelation, and binding

Low Molecular Weight (M.W. ~1,200)

• Ideal for controlled chemical modification
• Excellent solubility in water and many organic solvents
• Lower viscosity compared to high-MW PEI grades

Highly Reactive Cationic Polymer

Applications include:

• Nanoparticle functionalisation (gold, silica, magnetic nanoparticles)
• Gene delivery (DNA/RNA complexation) in research settings
• Resin and membrane surface modification
• Flocculation and chelation for water treatment
• Catalyst support & ligand modification
• Crosslinkers and polymer intermediates

Chemically Versatile Polyamine Structure

• Contains a mixture of primary, secondary & tertiary amines
• Supports reactions including alkylation, acylation, conjugation & crosslinking

Chemical & Regulatory Information

Physical Properties

Applications

1. Nanotechnology & Surface Chemistry

• Functionalisation of nanoparticles
• Coating of silica, metal oxides, magnetic particles
• Layer-by-layer assembly

2. Biotechnology & Life Science Research

• Temporary DNA/RNA complexation for transfection
• Immobilisation of biomolecules
• Surface charge modification

3. Polymer Science & Chemical Synthesis

• Crosslinking agent for epoxy, acrylic, and polyurethane systems
• Precursor for dendrimers and polyamine derivatives
• Catalyst support and ligand modification

4. Industrial & Environmental Applications

• Heavy metal chelation
• Flocculation and coagulation
• Water treatment agents
• Ion-exchange resin modification

Ordering Information

Thermo Scientific™ Polyethyleneimine (PEI), M.W. 1,200, ≥99%, branched, is a versatile low-molecular-weight polyamine suitable for advanced synthesis, nanotechnology, biotechnology, catalysis, water treatment, and material modification. Its high purity, strong cationic nature, and branched architecture make it an indispensable reagent for laboratories and industries requiring a reliable multifunctional polyamine.