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Introduction to polytetramethylene ether diol​

Views: 291     Author: Vickey     Publish Time: 2023-06-27      Origin: Site

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Introduction to polytetramethylene ether diol​

A white waxy solid, polytetramethylene ether diol is highly soluble in alcohol, ester, ketones, aromatics, and chlorinated hydrocarbons but insoluble in water and ester hydrocarbons. It turns into a translucent liquid when the temperature rises above room temperature.

A polyether glycol containing hydroxyl groups on both ends, PTMG is linear. As a polyol, it interacts well with isocyanates to create resins with exceptional qualities, including resistance to impact, resistance to hydrolysis, resilience to wear and tear, resistance to fungi, and flexibility at low temperatures. Applications for polyurethane include synthetic suede and leather, paints and coatings, adhesives and sealants, thermoset and thermoplastic elastomers, and polyurethane elastomers. Polyamide Applications, Polyester Elastomers (TPEE), and Polyether Amide Elastomers are examples of polyester applications.

Chemical property

Polytetramethylene ether diol is easily soluble in alcohols, esters, ketones, aromatic hydrocarbons, and chlorinated hydrocarbons and insoluble in ester hydrocarbons and water. The solubility decreases when the molecular weight increases. PTMEG is all-water absorbent at room temperature. Its water absorption depends on the size of the molecular weight, and it can absorb 2% of the water content at its highest point.

Methods of production

Polytetramethylene ether diol was first made in the late 1930s. Is a polymer generated by the ring-opening polymerization of tetrahydrofuran. can only be obtained by positive ion polymerization of THF. In industry, acetic anhydride-perchloric acid, fluorosulfonic acid, or smoke sulfuric acid are used as initiators to make tetrahydrofuran converge into a product of molecular weight 600–3000 and double end group as hydroxyl group.

Applications

PTMEG is mainly used as soft chain segments of block polyurethane or block polyether polyester. The block polyurethane rubber made from polytetrahydrofuran with an average molecular weight of 1000 can be used as tires, drive belts, gaskets, etc.; it can also be used for coating, artificial leather, film, etc. The block polyether polyester produced is a thermoplastic elastomer. The average molecular weight of 2000 can be used to make polyurethane elastic fiber. In 2008, it was reported that block polyurethane made from polyTHfuran has good anticoagulant properties and can be used as a medical polymer material.

Storagement and transportation

Polytetramethyl ether diol shall be stored in fully enclosed, dry, nitrogen-sealed tanks or other containers. The storage tank must be equipped with external or internal heating equipment to maintain its temperature at about 50 °C. The solidified PTMEG can be heated at about 70 °C for 24 hours, but it should not be stored at 90 °C for a long time.

Storage should be kept in a cool, dry, well-ventilated place far away from fire sources, sparks, and open fires. Because PTMEG has water absorption and easy oxidation, it is important to avoid exposure to water and air. To prevent static electricity, the transport container should be grounded. Wear gloves and protective goggles during loading and unloading to avoid contact with eyes and skin; wash with soap and water after finishing work. If burning occurs, use water spray, alcohol foam, dry chemicals, or a carbon dioxide fire extinguisher.

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