Thermo Scientific™ Polyethyleneimine (PEI), M.W. 10,000 and ≥99% purity, is a highly functional cationic branched polymer extensively used in nanotechnology, biotechnology, polymer chemistry, surface modification, wastewater treatment, catalysis, and advanced materials research.

This mid-molecular-weight PEI balances high charge density with moderate viscosity, making it ideal for controlled surface coating, nanoparticle functionalisation, chemical modification, and complexation of DNA, RNA, and metal ions.

The branched architecture provides a network of primary, secondary, and tertiary amine groups, enabling versatility across a broad range of chemical and industrial applications.

Key Features & Benefits

High-Purity Branched Polyamine (≥99%)

• Ensures consistent performance for demanding analytical, industrial, and research applications
• High base functionality for strong interaction with anionic species and reactive substrates

M.W. 10,000 – Optimal Balance of Reactivity & Processability

• Higher molecular weight than PEI 1,200, offering stronger film-forming ability and cohesive strength
• Lower viscosity than high-MW grades (e.g., 25k–750k), enabling easier handling and coating processes

Highly Reactive Cationic Structure

Ideal for:

• Nanoparticle coating & surface charge control
• Metal ion chelation & binding
• DNA/RNA complexation (research-grade transfection)
• Crosslinking and polymer functionalisation
• Epoxy, acrylic, and polyurethane system modification

Versatile Across R&D and Industrial Sectors

Applications include:

• Water and wastewater treatment
• Resin modification & adhesion promotion
• Biomaterials and hydrogel crosslinking
• Catalysis (ligand modification & support functionalisation)
• Adsorbent and membrane surface tuning

Chemical & Regulatory Information

Physical Properties

Applications

1. Nanotechnology & Advanced Materials

• Coating gold, silica, iron oxide, and polymer nanoparticles
• Formulation of nanocomposites and charged colloids
• Layer-by-layer (LbL) assembly

2. Polymer & Surface Chemistry

• Crosslinking agent for resins
• Adhesion promoter in coatings & composites
• Curing additive for epoxy systems

3. Biotechnology

• DNA/RNA binding (research-grade use)
• Biomolecule immobilisation
• Hydrogel formation & tissue engineering

4. Environmental & Industrial

• Heavy metal removal & chelation
• Water treatment flocculant
• Chemical scavenging and adsorbent preparation

Ordering Information

Thermo Scientific™ Polyethyleneimine (PEI), M.W. 10,000 ≥99%, Branched, is a highly versatile cationic polymer suitable for chemical, biological, and material science applications. Its mid-range molecular weight provides an excellent balance between reactivity and processability, making it a preferred choice for nanoparticle coating, polymer modification, catalysis, and water treatment.