(PER)fluoropolyether polymers
A technology of polymers and polyethers, which can be used in lubricating compositions, instruments, recording information storage, etc., and can solve problems such as attacks
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example 1
[0190] Step (a): Synthesis of HO(CH 2 ) 4 OCF 2 CFHO(CF 2 ) 4 OCFHCF 2 O(CH 2 ) 4 OH
[0191] A three-necked round bottom flask with magnetic stirring, temperature probe and reflux condenser was charged with 5.76 g of NaOH and 227.76 g of 1,4-butanediol. The mixture was heated at 70°C with stirring until the sodium hydroxide was completely dissolved. Then, the solution was cooled to 40°C, and 50 g of CF was added dropwise 2 =CFO(CF 2 ) 4 OCF=CF 2 . The resulting mixture was kept at 40°C for six hours under stirring until the perfluorobisvinyl ether was completely converted. Use 80ml of water and 80ml of CH for the crude product 2 Cl 2 Extraction; 120ml of fresh CH is used again 2 Cl 2 The aqueous phase was extracted, and the two organic phases were collected and extracted with brine (80 ml). Separate the organic phase and use anhydrous Na 2 SO 4 Work up, filter, and evaporate the solvent under reduced pressure to obtain 57.7 g of a mixture containing:
[0192] HO(CH 2 ) 4 [OCF 2...
example 2
[0204] Step (a): Synthesis of HO(CH 2 ) 3 [OCF 2 CFHO(CF 2 ) 3 OCFHCF 2 O(CH 2 ) 3 ] n OH
[0205] A three-neck round bottom flask with magnetic stirring, temperature probe and reflux condenser was charged with 6.69 g of NaOH, 82.40 g of 1,3-propanediol and 200 ml of acetonitrile. The mixture was heated at 40°C with stirring until the sodium hydroxide was completely dissolved. Then, add 107.40g of CF dropwise 2 =CFO(CF 2 ) 3 OCF=CF 2 . The resulting mixture was kept at 40°C for six hours with stirring until the perfluorobisvinyl ether was completely converted. Use 200ml of water and 200ml of CH for the crude product 2 Cl 2 Extraction; again with 200ml of fresh CH 2 Cl 2 The aqueous phase was extracted, and the two organic phases were collected and extracted with brine (200 ml). Separate the organic phase and use anhydrous Na 2 SO 4 Work up, filter, and evaporate the solvent under reduced pressure to obtain a mixture containing:
[0206] 33% of those who have the formula HO(CH 2 ...
example 3
[0215] Step (a): Synthesis of [HO(CH 2 ) 4 OCF 2 CFHOCF 2 OCF 2 CF 2 ] 2 O
[0216] A three-necked round bottom flask with magnetic stirring, temperature probe and reflux condenser was filled with 3.95g of NaOH, 178g of 1,4-butanediol and 80ml of HCF 2 CF 2 OCH 2 CH 2 OCF 2 CF 2 H. The mixture was heated at 70°C with stirring until the sodium hydroxide was completely dissolved, and then 54 g of [CF 2 =CFOCF 2 OCF 2 CF 2 ] 2 O. The resulting mixture was kept at 70°C for three hours under stirring until the perfluorobisvinyl ether was completely converted. The crude product was extracted with 150 ml of water; the organic layer was separated and the solvent was evaporated under reduced pressure at 100°C. The remaining viscous oil was filtered to obtain 33 g of a mixture containing: HO(CH 2 ) 4 [OCF 2 CFHOCF 2 O(CF 2 ) 2 O(CF 2 ) 2 OCF 2 OCFHCF 2 O(CH 2 ) 4 ] n OH, where n is from 1 to 4.
[0217] Step (b): Synthesis (EtOC(O)CF 2 CF 2 CF 2 OCF 2 CF 2 OCF 2 OCF 2 CF 2 -) 2 O and highe...
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