Azide group-containing fluoropolymers and method for preparing the same
An azide group-containing fluoropolymer of formula (1) having a perfluoropolyether group of specific molecular structure as the backbone and terminated with an azide group via methylene group is provided. N 3 —CH 2 —Rf 1 —CH 2 —N 3 (1)
1. An azide group-containing fluoropolymer having the following general formula (1):
N 3 —CH 2 —Rf 1 —CH 2 —N 3 (1)
wherein Rf 1 is a divalent perfluoropolyether group having the following general formula (2):
wherein a and b are each independently an integer in the range: a≥1, b≥1, 2≤a+b≤150.
2. A method for preparing the azide group-containing fluoropolymer of claim 1 , comprising the steps of:
reacting a fluoropolymer capped with a hydroxymethyl group at both ends of the molecular chain, having the following general formula (6):
HO—CH 2 —Rf 1 —CH 2 —OH (6)
wherein Rf 1 is as defined above with a halogenated sulfonyl compound, to form a fluoropolymer capped with a sulfonyl ester group at both ends of the molecular chain, and
reacting the fluoropolymer capped with a sulfonyl ester group at both ends of the molecular chain with sodium azide in a mixture of a non-fluorinated organic solvent and a partially or fully fluorinated organic solvent.