INDUSTRY COMPONENT

Terminal Hydroxyl Groups

Reactive hydroxyl groups at polymer chain ends enabling chemical modification and crosslinking in industrial polyethylene glycol plasticizers.

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Component Specifications

Definition
Terminal hydroxyl groups are reactive functional groups located at the ends of polyethylene glycol (PEG) polymer chains in industrial plasticizers. These -OH groups provide sites for chemical reactions such as esterification, etherification, and crosslinking, allowing modification of polymer properties including viscosity, compatibility, and thermal stability. In industrial applications, they enable covalent bonding with other materials and control of plasticizer performance characteristics.
Working Principle
The hydroxyl groups (-OH) at PEG chain termini undergo nucleophilic substitution and condensation reactions with acids, anhydrides, isocyanates, and other electrophiles. This reactivity allows chemical modification of the plasticizer backbone, creating ester or ether linkages that alter molecular weight, polarity, and compatibility with various polymer matrices. The number and reactivity of terminal hydroxyls determine the plasticizer's functionality in formulations.
Materials
Polyethylene glycol polymers with controlled molecular weight (typically 200-8000 g/mol), hydroxyl number 28-560 mg KOH/g, primary alcohol functionality, purity >99%, moisture content <0.1%.
Technical Parameters
  • Acid Value <0.1 mg KOH/g
  • Color (APHA) <50
  • Functionality 1.8-2.2 OH groups per molecule
  • Hydroxyl Value 28-560 mg KOH/g
  • Moisture Content <0.1%
  • Molecular Weight 200-8000 g/mol
  • Viscosity (40°C) 10-5000 mPa·s
Standards
ISO 14900, DIN 53240-2, ASTM D4274

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Terminal Hydroxyl Groups.

terminal hydroxyl groups polyethylene glycol plasticizer polymer modification reactive end groups industrial plasticizers PEG hydroxyl functionality Terminal Hydroxyl Groups in Chemical Manufacturing

Parent Products

This component is used in the following industrial products

Industrial Grade Polyethylene Glycol Plasticizer

High-purity polymeric plasticizer for industrial chemical formulations

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Industrial Grade Polyethylene Glycol

Polyether compound used as industrial chemical intermediate and processing aid

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Engineering Analysis

Risks & Mitigation
  • Moisture sensitivity leading to hydrolysis
  • Uncontrolled crosslinking reactions
  • Inconsistent reactivity between batches
  • Compatibility issues with certain polymer matrices
FMEA Triads
Trigger: Exposure to atmospheric moisture during storage
Failure: Hydrolysis of terminal hydroxyl groups reducing reactivity
Mitigation: Use sealed containers with desiccants, maintain storage below 30% RH
Trigger: Inconsistent hydroxyl functionality between batches
Failure: Variable plasticizer performance in polymer formulations
Mitigation: Implement strict quality control of hydroxyl value and molecular weight distribution
Trigger: Contamination with acidic compounds
Failure: Premature esterification or degradation reactions
Mitigation: Maintain acid value specifications and use dedicated processing equipment

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Hydroxyl value ±3% of specification, molecular weight distribution PDI <1.2
Test Method
ISO 14900 for hydroxyl value, GPC for molecular weight distribution, Karl Fischer titration for moisture

Buyer Feedback

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Frequently Asked Questions

Why are terminal hydroxyl groups important in industrial plasticizers?

They provide reactive sites for chemical modification, allowing customization of plasticizer properties like compatibility, viscosity, and thermal stability for specific industrial applications.

How are terminal hydroxyl groups measured in quality control?

Through hydroxyl value determination using titration methods per ISO 14900 or ASTM D4274, measuring the amount of potassium hydroxide equivalent to the hydroxyl content.

What happens if terminal hydroxyl groups are not properly controlled?

Inconsistent reactivity can lead to variable plasticizer performance, poor polymer compatibility, uncontrolled crosslinking, and batch-to-batch inconsistency in final products.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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