Polytetrahydrofuran Instruction:

Polytetrahydrofuran (PTMEG), also known as polytetramethylene ether glycol, is a white waxy solid easily soluble in alcohols, esters, ketones, aromatic hydrocarbons and chlorinated hydrocarbons, insoluble in ester fatty acids and water.

Polytetramethylene Ether Glycol Description:

PTMEG is a polymer produced by ring-opening polymerization of tetrahydrofuran. PTMEG is industrially produced by polymerizing tetrahydrofuran with a molecular weight of 600-3000, fluorosulfonic acid or fuming sulfuric acid as initiators. The indicators of PTMEG are influenced by each other, the hydroxyl value can help calculate the molecular weight, the acid value and moisture may affect the hydroxyl value, along with the distribution of molecular weight may also be uneven, the size of viscosity and hydroxyl value, the uniform distribution of molecular weight or not will directly affect the physical properties.

Color value: high color of PTMEG with many impurities of production raw materials; high reaction temperature, high color; catalyst productivity becomes large, the color rises; PTMEG storage and transportation with BHT (antioxidant), its reaction with oxygen to form substances with color; alkali substances cause adverse effects on the physical and chemical properties of synthetic polyurethane.

Polytetrahydrofuran was first produced in the late 1930s. PTMEG is a polymer produced by ring-opening polymerization of tetrahydrofuran. PTMEG can only be obtained by positive ionic polymerization of tetrahydrofuran. The reaction is as follows.
nC4H8O+H2O====(initiator)====HO-[-C4H8O-]n-H

Storage should be in a cool, dry, well-ventilated place, away from ignition sources, sparks and open flames. Since PTMEG is water absorbent and easily oxidized, PTMEG is important to avoid exposure to moisture and air. To prevent static electricity, transport containers should be grounded. When loading and unloading, gloves and protective goggles should be worn to avoid eye and skin contact; wash with soap and water after finishing work.