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Methallyl polyoxyethylene ether (HPEG-2400)
CAS No.
Synonyms
Molecular formula
Molecular weight
Not specified in the supplied record.
Grade
Packaging
Chemical Product Description & Applications
HPEG is a methallyl-functional polyethylene glycol macromonomer used to manufacture polycarboxylate-ether superplasticizers. Its unsaturated end group enters the polymer backbone during copolymerization, while the long polyether chain becomes a hydrophilic side chain. In the resulting dispersant, these side chains provide steric separation between cement particles.
The selected material is an HPEG-2400-class solid macromonomer with nominal molecular mass near 2,400. It is combined with suitable carboxylic-acid monomers to build a comb-shaped polymer; the macromonomer itself is not the finished concrete water reducer. Backbone composition and side-chain architecture influence adsorption, dispersion and flow retention. Its methallyl-derived structure distinguishes this scope from isoprenol-derived TPEG products.
Typical Applications
- PCE water-reducer synthesis: Used with suitable unsaturated carboxylic-acid monomers to manufacture comb-shaped PCE polymers for high-range concrete water reducers and workability-control admixtures.
Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | White flakes | Visual inspection |
| Identification | Consistent with authenticated reference | FTIR fingerprint comparison |
| Hydroxyl value | 21-26 mg KOH/g | Acetylation and back-titration |
| Double-bond retention | ≥98.0% of theoretical | Proton NMR with internal standard |
| Water | ≤0.50% w/w | Karl Fischer titration |
| pH, 5% aqueous solution at 25 C | 5.0-7.0 | Calibrated pH meter |
Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.
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