Overview
2,5-Dimethyl-2,5-hexanediol (DMHD) is an organic compound belonging to the class of glycols. This symmetrical diol features two hydroxyl groups positioned on tertiary carbon atoms, giving it unique reactivity in polymer chemistry. Industrially produced through the hydrogenation of 2,5-dimethyl-2,5-hexadiol, it serves as a valuable intermediate in specialty chemical synthesis. First commercialized in the 1960s, DMHD gained prominence for its ability to introduce branching points in polymer chains. Its molecular structure combines hydrocarbon-like properties with alcohol functionality, making it useful for modifying material properties in coatings, adhesives, and elastomers.
Physical and Chemical Properties
As a crystalline solid at room temperature, DMHD exhibits moderate solubility in polar solvents due to its dual hydroxyl groups. The compound's high melting point (92-94°C) reflects its symmetrical molecular structure and strong intermolecular hydrogen bonding. Its boiling point of 214-216°C indicates relatively low volatility compared to shorter-chain glycols. Chemically, DMHD undergoes typical alcohol reactions including esterification, etherification, and urethane formation. The tertiary carbon positions make it resistant to oxidation under normal conditions. The compound shows good thermal stability up to 200°C, though it may decompose at higher temperatures to form ketones and water.
Main Applications
In polyurethane production, DMHD serves as a chain extender that introduces controlled branching, improving flexibility and impact resistance in final products. Approximately 60% of global production is consumed by PU manufacturers. The compound also finds use as a building block for specialty plasticizers, particularly for PVC applications requiring low migration rates. The coatings industry utilizes DMHD in alkyd resins to enhance hardness and drying properties. Emerging applications include its use as a crosslinker in silicone-modified polymers and as a precursor for high-performance lubricant additives. In laboratory settings, it functions as a model compound for studying hydrogen bonding in crystalline solids.
Safety and Storage
Classified as an irritant (GHS category 2 for eye/skin irritation), DMHD requires proper handling with nitrile gloves and safety goggles. Although not highly toxic (LD50 oral rat >2000 mg/kg), inhalation of dust should be avoided through local exhaust ventilation. The compound is combustible with a flash point of 110°C (closed cup). For storage, keep containers tightly closed in a cool (below 30°C), dry environment separate from strong oxidizers. Bulk storage typically uses polyethylene-lined fiber drums or multi-layer bags with moisture barriers. Shelf life exceeds two years when properly stored, though material should be checked for discoloration or clumping before use.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 98-99.5%) based on application needs. Technical grade suffices for polymer applications, while electronic or pharmaceutical uses may require ultra-high purity grades. Packaging options range from 25kg bags to 200kg drums, with palletized shipments being most cost-effective. Key supplier qualifications include ISO 9001 certification, batch traceability, and compliance with REACH regulations. Asian suppliers dominate production, with China accounting for approximately 70% of global capacity. Consider requesting samples for FTIR and GC analysis to verify consistency between batches. Minimum order quantities typically start at 500kg, with lead times of 2-4 weeks for spot purchases.
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