| Reduction of Liquid Carboxyl-terminated Fluorine Rubber by Alkyl Aluminum/Lithium Aluminum Hydride Reduction System |
| Received:January 04, 2022 Revised:January 04, 2022 |
| DOI：10.12136/j.issn.1000-890X.2022.12.0891 |
| Key Words: liquid carboxyl-terminated fluorine rubber；liquid hydroxyl-terminated fluorine rubber； reduction；DIBAl-H；Al（i-Bu）3；LiAlH4 |
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| Abstract: |
| In this study, liquid hydroxyl-terminated fluorine rubber（LTHFs） was prepared by reduction
of liquid carboxy-terminated fluorine rubber（LTCFs）by using two reduction systems: diisobutylaluminum
hydride（DIBAl-H）/lithium aluminum hydride（LiAlH4） and triisobutylaluminum hydride[Al（i-Bu）3]/
LiAlH4. Fourier transform infrared spectroscopy，nuclear magnetic resonance hydrogen spectroscopy and
nuclear magnetic resonance fluorine spectroscopy analysis showed that both reduction systems could reduce
the carbon-carbon double bond and carboxyl group in LTCFs to carbon-carbon single bond and hydroxyl
group, respectively. Further comparing the reducing capacity of the two reduction systems, it was found
that DIBAl-H/LiAlH4 was more suitable for LTCFs reduction，and the reduction rate could reach 88% at
the optimal condition in which the reaction temperature was 60 ℃，the reaction time was 8 h and the molar
ratio of COOH/LiAlH4/DIBAl-H was 1/1/2. Compared with the traditional strong reducing agent LiAlH4，
DIBAl-H/LiAlH4 could reduce the reaction temperature and reduce the amount of reducing agent. |
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