مه . 16, 2025 09:39 Back to list
(hydroxyethyl cellulose chemical formula)
The molecular structure of hydroxyethyl cellulose (C2H6O2)n combines cellulose's backbone with ethylene oxide groups, creating a water-soluble polymer with unique rheological properties. With a degree of substitution (DS) ranging from 0.8 to 2.5 in commercial grades, this chemical formula enables:
Parameter | Ashland HEC | Dow HPMC | Shin-Etsu HEC |
---|---|---|---|
Viscosity Range (mPa·s) | 1,000-80,000 | 4,000-200,000 | 5,000-150,000 |
Moisture Content (%) | ≤5 | ≤3 | ≤4.5 |
DS Value | 1.8-2.5 | 1.2-1.8 | 2.0-2.3 |
Recent field tests demonstrate 23% higher efficiency in water retention compared to methylcellulose derivatives. The hydroxyethyl group substitution pattern enables:
Leading producers differentiate through particle size distribution:
Third-party testing confirms batch-to-batch viscosity consistency within ±8% for ISO-certified manufacturers.
Industry | Viscosity Requirement | Special Additives |
---|---|---|
Architectural Coatings | 15,000-25,000 mPa·s | Antimicrobial agents |
Pharmaceutical | 4,000-8,000 mPa·s | USP-grade purity enhancers |
A European paint manufacturer achieved 18% reduction in sagging incidents using customized HEC with DS 2.1. In pharmaceutical tablet coatings, modified hydroxyethyl cellulose formula reduced disintegration time from 45 to 28 seconds while maintaining 99.2% API release efficiency.
Ongoing research focuses on hybrid systems combining hydroxyethyl cellulose chemical formula
with nano-silica particles, showing 35% improvement in mechanical strength for construction materials. Second-generation HEC derivatives now achieve:
(hydroxyethyl cellulose chemical formula)
A: Hydroxyethyl cellulose does not have a fixed molecular formula due to variable substitution levels. It is generally represented as (C2H4O)n attached to a cellulose backbone (C6H10O5)m. The exact formula depends on the degree of hydroxyethyl group substitution.
A: The formula of hydroxyethyl cellulose consists of a cellulose chain modified with hydroxyethyl (-O-CH2-CH2-OH) groups. Its simplified notation is often written as [C6H7O2(OH)3-x(OCH2CH2OH)x]n. The "x" represents the degree of substitution per glucose unit.
A: Hydroxyethyl cellulose's structure features ether-linked hydroxyethyl groups replacing hydroxyls on cellulose's glucose units. Unlike unmodified cellulose, these substitutions enhance water solubility and thickening properties. The substitution pattern varies based on manufacturing conditions.
A: Hydroxypropyl methylcellulose (HPMC) contains both methoxy (-OCH3) and hydroxypropyl (-O-CH2-CHOH-CH3) groups, unlike HEC's hydroxyethyl groups. Both are cellulose ethers, but HPMC's dual substitution provides distinct thermal gelation and film-forming properties compared to HEC.
A: HPMC is denoted as [C6H7O2(OCH3)y(OCH2CH(OH)CH3)z]n, where "y" and "z" indicate methoxy and hydroxypropyl substitution degrees. Its properties depend on the ratios of these substituents, which are standardized in commercial grades.
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