Polyethylene Glycol Diglycidyl Ether (PEGDGE)
CAS Number: 72207-80-8
Polyethylene Glycol Diglycidyl Ether (PEGDGE) is a difunctional flexible epoxy based on polyethylene glycol (PEG-200 or PEG-400) end-capped with glycidyl ether groups, providing a long flexible PEG spacer between the two reactive epoxide termini with EEW of 170–250 g/eq. Used as a reactive flexibilizer and diluent, it reduces brittleness and increases peel strength in rigid epoxy systems, adds hydrophilicity, and improves cryogenic-temperature performance. It is also used as the crosslinker in biomedical hydrogels and water-swellable sealants where biocompatibility and chain flexibility are required.
Technical Specifications
| EEW | 170–250 g/eq |
| viscosity | 30–100 mPa·s at 25 °C |
| appearance | Clear, colorless to pale yellow liquid |
| PEGBackbone | PEG-200 or PEG-400 |
| miscibility | Fully miscible with water and most epoxy resins |
Applications
- Reactive flexibilizer and diluent in rigid epoxy systems
- Peel-strength improvement in structural epoxy adhesives
- Biomedical and pharmaceutical hydrogel crosslinker
- Water-swellable sealant and gasket formulations
- Cryogenic adhesives and coatings for LNG equipment
Key Features
- PEGDGE acts as a reactive flexibilizer — incorporates into the cured network without migration, permanently improving toughness
- Long PEG spacer dramatically reduces glass transition temperature and improves cryogenic flexibility
- Water miscibility makes PEGDGE a unique hydrophilic epoxy component for waterborne and hydrogel applications
- Low viscosity (<100 mPa·s) reduces overall system viscosity without sacrificing cure chemistry
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CAS Number
72207-80-8
Category
Epoxy System ChemicalsAvailability
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