Reaktion #575663

Reaktionsgleichung

isocyanate

Isophorone diisocyanate

2-hydroxyethyl acrylate

HEA

→

urethane acrylate

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeA 250 mL, 3 neck round bottom flask fitted with a mechanical stirrer
2. 2
   Sonstigea thermometer was dried under nitrogen
3. 3
   workup.ADDITIONcharged with poly-7-FOX diol (polyfluorooxetane diol with heptafluoro group) (24.3 grams, 9.1 meq.) from Example 5
4. 4
   Temperaturthe mixture was heated at 70 C for 14 hours
5. 5
   Waschenwashed with heptane (2 times 100 mL each)
6. 6
   SonstigeThe isocyanate-terminated poly-7-FOX prepolymer
7. 7
   workup.DISSOLUTIONwas then dissolved in tetrahydrofuran (50 mL)
8. 8
   workup.ADDITIONtreated with dibutyltin dilaurate (12 mg)
9. 9
   Sonstigethe reaction mixture was precipitated into water (450 mL)
10. 10
    TrocknenThe resulting solution was dried over magnesium sulfate
11. 11
    Filtrationfiltered

Vorschrift

A 250 mL, 3 neck round bottom flask fitted with a mechanical stirrer and a thermometer was dried under nitrogen and charged with poly-7-FOX diol (polyfluorooxetane diol with heptafluoro group) (24.3 grams, 9.1 meq.) from Example 5. Isophorone diisocyanate (3.0 grams, 27.2 meq) and dibutyltindilaurate (12 mg) were added and the mixture was heated at 70 C for 14 hours. The reaction mixture was cooled to room temperature and washed with heptane (2 times 100 mL each). The isocyanate-terminated poly-7-FOX prepolymer was then dissolved in tetrahydrofuran (50 mL) and treated with dibutyltin dilaurate (12 mg). The resulting solution was reacted with 2-hydroxyethyl acrylate (HEA, 1.16 gram, 10 meq) at room temperature. No observable exotherm was observed on the addition of HEA. The progress of the reaction was monitored by following the disappearance of the isocyanate band in an infrared spectroscopic spectrum (IR) at 2270 cm−1. The mixture was heated at a temperature of 60 C for 4 hours. On completion, as indicated by the disappearance of the NCO band in the IR, the reaction mixture was precipitated into water (450 mL). The resulting solution was dried over magnesium sulfate, filtered and stripped of solvent under reduced pressure to produce 17.2 grams of a urethane-acrylate terminated poly-7-FOX.

Quelle