| 摘要 |
Linear perfluoropolyethers of formula: <?in-line-formulae description="In-line Formulae" end="lead"?>T-O(CF<SUB>2</SUB>O)<SUB>n</SUB>(CF<SUB>2</SUB>CF<SUB>2</SUB>O)<SUB>m</SUB>(CF<SUB>2</SUB>CF<SUB>2</SUB>CF<SUB>2</SUB>O)<SUB>r</SUB>(CF<SUB>2</SUB>CF<SUB>2</SUB>CF<SUB>2</SUB>CF<SUB>2</SUB>O)<SUB>s</SUB>-T<SUB>1</SUB> (I)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein n, m, r, s are integers such that the polymer number average molecular weight is comprised between 700 and 100,000 and the n/(n+m+r+s) ratio ranges from 0.05 to 0.40, and respective preparation process by addition of a peroxidic perfluoropolyether of formula (III): <?in-line-formulae description="In-line Formulae" end="lead"?>T<SUB>4</SUB>-O(CF<SUB>2</SUB>O)<SUB>n'</SUB>(CF<SUB>2</SUB>CF<SUB>2</SUB>O)<SUB>m'</SUB>(O)<SUB>h</SUB>-T<SUB>5</SUB> (III)<?in-line-formulae description="In-line Formulae" end="tail"?> having a PO from 1.8 to 4, to a perfluoropolyether oil preheated at a temperature comprised between 150° C. and 250° C. and subsequent exhaustive fluorination of the obtained compound.
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