Preparation of Polyether Triol and Three-Armed Polyether Triol by Tetrahydrofuran Polymerization Initiated with Heteropolyacid

摘要

The properties of segmented polyurethane composed of hard and soft segments can be modified by the crosslinking reaction. Random crosslinking initiated by peroxides or the chemical crosslinking initiated by peroxides or the chemical crosslinking in the hard segments using short triols as chain extenders leads to poor mechanical properties. The polyurethane crosslinked in the soft segments using copoly (oxypropylene-tetrahydrofuran) [copoly (PO-THF)] triols had slightly lower elongation at break and similar Young modulus, but higher ultimate stress strength, almost doube that of linear polyurethane. So the mechanical properties of polyurethane could be improved by the chemical crosslinking in the soft segments using polyether polyols.