Halogen-containing polyether

摘要: Abstract: The invention provides a halogen-containing polyether comprising repeating units of the formula: -(CH2CF2CF2O)a-(CHClCF2CF2O)b-(CC12CF2CF2O)c-(CHFCF2CF2O)d-(CFClCF2CF20)e-(CF2CF2CF2O)f- (I) wherein a, b, c, d, e and f are each an integer not less than 0 satisfy following equations:2 ?a+b+c+d+e-tf ? 200 1 a+c-td+f may be prepared by ring-opening polymer-izing 2,2,3,3-tetrafluorooxetane in presence polymerization initiator to give -(CH2CF2CF2O)a- (II) is same as defined above, optionally fluorinating and/or chlorinating (II). resulting polymers useful intermediates production various fluorine-containing compounds, surfactants, heat transfer mediums, lubricants, plasticizers, modifiers, etc. molding materials.