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Reduction of liquid terminated-carboxyl fluoroelastomers using NaBH4/SmCl3
Yunfei Chang1, Mingyi Liao1, Xueyan Li1
1College of Transportation Engineering, Dalian Maritime University No. 1 Linghai Road Dalian 116026 China liaomy2000@sohu.com.
Abstract:
Using a simple one-pot method, the reduction of liquid terminated-carboxyl fluoroelastomers (LTCFs) by sodium borohydride and samarium chloride (NaBH4/SmCl3) was successfully realized and liquid terminated-hydroxyl fluoroelastomers (LTHFs) were obtained. The structure and functional group content of LTCFs and LTHFs were analyzed by FTIR, 1H-NMR, 19F-NMR and chemical titration. The results showed that -C[double bond, length as m-dash]C- and carboxyl groups of LTCFs were reduced efficiently, the reduction rate reached 92% under optimum reaction conditions. Compared with other frequently-used metal chlorides, SmCl3 with a high coordination number could increase the reduction activity of NaBH4 more effectively and the reduction mechanism was explored.
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